What glue can be used to glue aluminum. How to choose and use aluminum adhesive correctly

Aluminum and its alloys are among the most common in modern world metals It has a lot of advantages, which is why it has gained popularity, but its use is also marked by a number of disadvantages. In particular, the problem of fastening becomes a stumbling block.

This metal does not withstand conventional bolted joints well due to its softness. It is possible, but it requires complex equipment and qualified specialist, which may not be at hand.

Therefore, in many cases, especially when the connection is not presented special requirements in terms of tensile strength, aluminum comes to the rescue.

How to glue aluminum to aluminum? Basically, various two-component compositions are used, the basis of which is epoxy resin. Additional component, providing strength and adhesion to metals, is fine steel powder, which is added to the epoxy base immediately before use.

Such adhesives can be produced in various states of aggregation - both in liquid or semi-liquid form, close to a gel or resin itself, and in the form of mastic - a plasticine-like mass from which rectangular or cylindrical bars are formed.

Each bar consists of two substances not mixed with each other. Mixing, which activates the adhesive properties of the mastic, occurs in the human fingers immediately before application.

Advantages and disadvantages of strain welding

The first method - under pressure - is more often used in factories.

Its main advantage is that the seam is formed from the same material as the parts, this reduces the cost of conveyor production and allows the formation of joints that are close in strength to cast parts.

Aluminum under pressure can be said to be high temperature. It allows the parts to withstand the same level of heat as pure aluminum.

Advantages of deformation welding:

  • withstands big differences temperatures;
  • withstands great pressure (but no more than the metal itself can withstand);
  • shows resistance in aggressive environments;
  • doesn't highlight harmful substances into the environment.

The only disadvantage is the need to use special equipment for such welding.

There are three main methods of such welding:

  1. Stykova.
  2. Suture.
  3. Spot.

In the first case, two parts are connected end-to-end in a press and are strongly compressed along the longitudinal axis.

In this way, it is possible to weld elements with a local joining area (small size). It is necessary to take into account the process of “loss” of material after compression: for example, when welding two pieces of aluminum reinforcement in this way, their total length will be 5-7% less than total length separately.

Using the suture method, two parts with a long seam length are fastened together, for example, two sides of one sheet, forming a pipe. They are overlapped and placed under a pressure roller. Rotating, the roller compresses the aluminum sheets and presses them against the support shoe, pressing them into each other. This way a uniform seam is formed.

The disadvantage of this technology is that this seam itself is weak point in the design. Therefore, where it is necessary to withstand high loads, the point-suture method is used, in which the roller is not smooth, but protected. The protectors are working ridges that provide localized pressure so that the seam appears not as a line, but as a uniform chain of dots. It is stronger than a “smooth” seam.

And finally, the point method itself - two overlapped sheets or plates of aluminum are subjected to force at several local points by superhard objects - punches.

When they are pressed into aluminum and then removed, a weld point is formed. With the correct calculation of the geometry of these points and the magnitude of the deforming effect, very High Quality connections with minimal metal loss.

Please note: during butt welding, antioxidant treatment, that is, abrasion of the surface oxidized layer, occurs simultaneously with the welding process; in all others, it is necessary to first clean the surfaces of the parts being welded from oxides.

Advantages and disadvantages of glue welding

The main advantage of any adhesive composition is ease of use at home, for personal needs, including when carrying out work with tightness requirements. You can select an adhesive composition with special additives for high-temperature welding. This method of joining aluminum parts is very simple and cheap.

How to glue aluminum to aluminum? If you are using a bar of two-component mastic, then simply cut off the required amount from it and knead it in your fingers until the mixture is mixed and softened.

Degrease the surfaces you are going to glue with acetone or another solvent, wipe dry and apply the compound. The plastic mass will take any shape and fill any hole, so it can be used for sealing cracks in aluminum parts, installing plumbing elements and other needs in almost any area.

If you are using a composition with liquid base, then, following the instructions, simply mix the metal powder with the epoxy mass to obtain a plastic mass, and proceed as described above.

If the advantage of such welding is ease of use and low prices for compounds, then there are many more disadvantages.

CQHAM.RU Forum > TECHNICAL FORUMS ON CQHAM.RU > Technical room > Metal bonding

View full version: Metal bonding

03.02.2013, 18:25

I have a problem. The video camera fell and the metal casing broke. It's kind of very light and fragile Aluminium alloy. I was told it is an alloy of aluminum and silicon. ?? This alloy cannot be welded.

Maybe someone has dealt with this? How to glue aluminum? Or maybe it needs to be riveted? I'll need an extra piece of metal. Maybe they became? I look forward to your advice.

Try this http://www.kontakt123.ru/super.html or this http://poliyrethane.narod.r u/super_glue.htm

IMHO, Poxipol with metal filler will be the best option. If the part is loaded, then, if possible, reinforce it with some metal overlays (glue and fill everything together). I wouldn’t rivet it (however worse it would be to destroy it), but it’s worth screwing it in with small screws...

Sergey 12701

03.02.2013, 18:49

Try looking for WURTH "saBesto" cyanoacrylate adhesive. It sticks to almost everything and is very durable.

03.02.2013, 19:49

Sorry, " liquid metal"Wurth type FE1"

If possible with inside strengthen, then make drillings for 2/3 of the thickness of the body, this is for better adhesion of the glue to the body, and also drill holes in the plate which you will strengthen. It is advisable to use glue that does not dry quickly and add some small silumin sawdust to it; they will be like reinforcement. But before work, practice on some piece of similar material.
Anatoly.

Welding involves melting the edges, it will not work here because... a rough seam will come out or the part will deteriorate. And before welding, you will need to understand what technology and equipment will be required, and then make a test seam on a test material. Not our option.
Look - maybe you can solder a plate from the inside to reinforce the joint; 0.1-0.2 mm of some metal thickness, or several pieces of wire across the joint, will be enough.
Or butt solder with a thick layer of hard solder, followed by processing of the outer surface.
If it is not soldered, then you can consider the option of gluing the inside of the same metal plate with superglue, or 1-2 layers of fabric with glue or epoxy.
If the part is thin-walled and warped when destroyed, then the butt gluing will not hold properly.
If there is external painting of the part, then think about how to restore it all later.
The main thing is to think through all the actions and prepare materials.
And the most important thing is not to rush anywhere, because... a good thought comes later.

A little about superglue (of normal quality) - I used it to glue fragments together for testing ceramic tiles(ceramic granite, no pores) 6 mm thick and broke this joint the next day - all the samples broke along another arbitrary line, this made a very strong impression.
Good luck!

Soldering or gluing duralumin with epoxy is not good.
It's better to glue it. Now there is very good glues.
You just need to take ones that do not set immediately, but after 20 seconds, in order to have time to accurately combine the parts.
Here is one of these: UHU Super Strong & Safe Alleskleber
Conducted and registered the inspection. A few drops of this glue were applied to a cylinder D=7cm and glued to a Ford car weighing more than 4T and lifted by this cylinder. Holds!!!

It is a kind of very light and brittle aluminum alloy. I was told it is an alloy of aluminum and silicon. ??

This alloy is called silumin. Very widely used for aluminum casting. Butt gluing will not hold. Better with reverse side If there is a break, glue an overlay made of any durable material. In the “old days” they glued with the help of BF-2. Nowadays, of course, adhesives are better.

Georgievich

06.02.2013, 14:30

I sincerely sympathize, but how is it possible that the casing burst!!! By the way, you need to be careful, what kind of camera is it?

06.02.2013, 15:51

Sony camera, one of the newest models. :-(All this is in a hurry.
The tripod leg slipped and the camera fell. We didn't have time to catch it. 🙁 Thanks for the advice. I realized that riveting is dangerous. Yes, additional plates must be used. And a few screws.
I haven't chosen the glue yet. I'll have to try glue on aluminum plates.

Added after 13 minutes:

As I understand it, silumin is a rather capricious metal. Well, yes ….

09.02.2013, 19:26

Back in Soviet times, I purchased 10 bags of household metal adhesive film produced by MSO Alfa for 90 kopecks each. 10x10 film is very thin, a piece of any configuration can be cut from it. The instructions say glues - steel, aluminum, galvanized sheet, bronze, brass, etc. Accordingly, there are instructions on how to glue. Tensile strength from 30 to 180 kg/cm2. More than 15 years have passed, the warranty period has long expired. Nevertheless, I still glue it now. I glued broken binoculars and other small things from different metals, even 1 mm end-to-end. Most likely this company no longer exists. Try googling, maybe you'll get lucky. Good luck…

I use a homemade electric drill with a 0.5 - 6 mm chuck based on a 27V motor. The cartridge is mounted on the shaft using an adapter sleeve made of silumin, and the sleeve is secured both to the 6mm shaft of the engine and in the cone of the cartridge with ordinary Soviet epoxy. Yes, this was done in 1984. It still serves, has not fallen off, cracked, or lost alignment.

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Aluminum glue

High adhesion of the adhesive ensures exceptional strong connection aluminum structures.

Scope of application of adhesive compositions

  • gluing metal corner connections in the door, window, facade industry;
  • used for power connections of RVs when one of the components to be connected is fiberglass plastic;
  • a number of others manufacturing industries where metal parts are fastened.

Applying glue for aluminum

Surfaces are pre-cleaned and degreased by special means, adhesive composition applied thin layer and the elements are pressed tightly against each other for several seconds. If in the future the connected parts will experience mechanical loads, application is made to almost the entire gluing area.

Determine the duration of action of glue for aluminum, taking into account temperature regime, humidity, type of surface and some other factors.

Advantages of the composition

  • ease of use, some types of products are equipped with special attachments;
  • weather resistance;
  • glue for aluminum does not spread, does not contain solvent impurities;
  • After hardening (about 16 hours), the connection can be painted or undergo other types of processing.

Cosmofen DUO adhesive is used for structural fastening and sealing of metal aluminum, anodized, spray-coated frames and profiles in the manufacture of windows, doors and facades.
more details // buy

A quick-drying cleaner with an antistatic component, used for cleaning aluminum surfaces and planes.
more details // buy

Cosmofen CA 12 (20 grams)


more details // buy

Cosmofen CA 12 (50 grams)

One-component cyanoacrylate composition with high initial adhesion, good adhesion to a wide variety of materials, especially high strength shear and tear resistance, durability, water resistance, temperature and chemical resistance.
more details // buy

Cosmoplast 500
One-component instant adhesive based on cyanoacrylate, used both in industrial production(metalworking, plastics processing, sealing), and in everyday life.
more details // buy

Cosmofen HDP 900 – dosing gun

Reliable manual dispensing gun for Cosmofen DUO glue in double tubes 900 g.
more details // buy

Why does aluminum stick poorly?

Aluminum is a great metal. Doors, windows, facade systems made of aluminum are lightweight, durable and resistant to impact external environment. One “but”: welding aluminum structures - difficult process, available only to professionals.

Therefore, practically the only one available for “ common use» The method of joining aluminum surfaces is gluing. It would seem, what could be simpler? However, here too aluminum shows its cunning streak.

The fact is that in its normal state, aluminum is covered with a hard oxide film, which has very low adhesion. If it is not destroyed before gluing, any connection will be weak and short-lived. Simple mechanical processing of a part is ineffective: in air, the surface of the part quickly oxidizes again.

Relatively good results can be achieved only by first preparing the surface of aluminum parts with acids, alkalis, or special compounds, usually polyurethane or epoxy based. Therefore, most adhesive compositions produced for aluminum include precisely these chemical compounds.

Aluminum glue

The most common is two-component aluminum adhesive. As the name implies, it consists of two components: epoxy or acrylic mass, and a hardener.

Aluminum adhesive - answers to important questions

These components are mixed before use.

Good quality of the adhesive joint is achieved if, before gluing, the surfaces of aluminum parts are degreased or coated with a special primer; however, in the latter case, it is necessary to ensure that the primer and glue, when mixed, do not produce unexpected chemical reaction. One-component adhesive for aluminum, popularly called “cold welding,” is also widely used.

It is very convenient to use, but the adhesive joint it forms is weak, so “cold welding” is usually used to seal cracks and holes.

Special mention should also be made about connecting aluminum to other types of surfaces (for example, stone). Due to the very large difference in thermal expansion, the adhesive connection of such surfaces will be weak. Therefore, in such cases, it is recommended to use mechanical connection or connection using elastic adhesive tape.

And even though some say that there is no “good” glue for aluminum, with some effort and following the instructions you can achieve high-quality results in gluing this capricious metal.

03/24/2013 at 23:03

Motorka.org » Repair » Repair of light alloy bodies

Adhesives for repairing duralumin hulls

The use of glue in the repair (and construction) of duralumin hulls ensures high joint strength, moisture and water resistance, and resistance to gasoline and oil. Being a good sealing material and dielectric, the glue prevents the occurrence of contact and crevice corrosion in the joints of parts.

The most accessible adhesives are based on an epoxy binder, for example, the universal EDP adhesive sold in stores. The packaging set includes an epoxy compound EDP (ED-6 epoxy resin with a plasticizer) and a hardener - polyethylene polyamine. When preparing glue for 10 parts by weight of the compound, it is necessary to measure 1 part of the hardener.

The surfaces to be bonded are cleaned sandpaper, wire brush or a file, then wipe with a swab moistened with acetone or gasoline and dry.

The glue is applied in a thin layer using brushes, spatulas or foam rollers. After a short period of 5-10 minutes (“open”) exposure, the parts are folded and tightly compressed using clamps, screws or weights. The glue squeezed out during pressing is removed. For a better fit of the parts and to obtain an adhesive seam with a thickness of 0.3-0.4 mm, it is necessary to provide a pressing pressure of 0.5-1.0 kg/cm2, evenly distributed over the entire surface to be glued. The parts are kept under pressure until the glue completely hardens, which when room temperature(18-25°) occurs within 24 hours; with more high temperature Curing time is slightly reduced. It must be remembered that the “survivability” of epoxy glue, i.e.

What and how to glue aluminum

the time for maintaining the best adhesive qualities is from 30 minutes to 2 hours. When preparing a portion of glue, you need to take this into account and determine its quantity based on the approximate consumption rate of 0.04 g/cm3 for one-sided application and 0.06 g/cm2 for double-sided application.

In cases where it is necessary to fill the gaps between parts, a filler is introduced into the glue - aluminum powder, metal filings, asbestos, talc, tooth powder or ocher (dry). When adding filler, you need to ensure that the glue remains fluid and is easily applied to the surfaces of the parts to be glued.

Using a filler adhesive, you can seal small dents, minor cracks and pits in sheathing and deck sheets. After the glue has cured, the surface is leveled and painted. To better guarantee tightness in case of through cracks in the bottom, it is useful to additionally seal the repaired area with a patch made of thin durable fabric.

Guide to boats, boats and motors. Edited by G. M. Novak.

Aluminum is a very strong, lightweight metal with high impact resistance environment, but at the same time has absolutely no adhesion. Until recently, gluing aluminum parts was not possible, but thanks to industrial progress that has stepped far forward, this fastening method is gaining popularity, leaving behind different kinds welding Adhesives for aluminum contain acids and alkalis in their composition. required quantity, which destroy the metal oxide film, increasing adhesion and increasing the strength and durability of the connection.

Types of glue

This is, of course, a huge plus, because any welding requires professional skills, and we have been accustomed to gluing since childhood. Moreover, aluminum is increasingly used in production: window frames, profile, pipes, doors, windows, office partitions and much more. The designs are lighter and much cheaper than their analogues.

Types of glue and selection rules

Polyurethane or epoxy based adhesives are optimal for working with aluminum. They contain chemicals that ensure reliable fastening.

Adhesives for aluminum polyurethane based classified into:

  • One-component, they contain polyurethane polymer, without solvent. This type of glue is used on open elements that are pre-sprayed with water. By reacting with a wet surface, one-component adhesive bases harden, providing a strong connection.
  • Two-component polyurethane based. Unlike one-component adhesive compositions, this type of glue already contains a hardener and does not require additional manipulations with water. Most often used in enclosed spaces.

    How to choose and use aluminum adhesive correctly

    The composition is resistant to oils, mold, fungi, and also has sufficient heat resistance and high elasticity.

Aluminum glue

There are also resin-based adhesives for aluminum:

  • Two-component epoxy based. This type of glue has high adhesion and heat resistance, therefore it is most often used for external installation of aluminum structures, or when gluing materials with different thermal expansion - stone, wood, porcelain, etc. It should be noted here that a strong connection between various materials difficult to achieve. Therefore, it is recommended to use, in addition to adhesive, a mechanical connection, for example: using an elastic band. Resin-based adhesive compositions come in cold and hot hardening and, depending on the application, the required type of gluing is selected. Cold compositions harden at temperatures from +15 to +350, hot ones at temperatures from +1000 degrees and are often used in industrial enterprises.

It should be noted that any two-component adhesive compositions are mixed with a hardener before use, usually in a 1:1 ratio. But sometimes the mixing formula may be changed to achieve a fluid joint, variations of which are indicated on the product label.

When choosing adhesive for aluminum, pay attention to the parameters indicated on the packaging:

  1. Heat resistance, and depending on where exactly the adhesive base will be used, choose the right product.
  2. Water resistance, provided that the base is in contact with water.
  3. Is it possible to mount with different materials?
  4. Curing time, which depends on the composition and temperature of application, and varies from several minutes to an hour.

Be sure to check the tightness of the product and the expiration date.

Aluminum is a lightweight metal that has been used in industry for many decades. During this period of time, it was found that cold welding for aluminum and its alloys is the only way to join workpieces.

What is cold welding?

Cold welding- a method of joining metal parts, which is produced without heating, under pressure. Bonding is carried out due to plastic deformation of the mass and its penetration into the surfaces being welded. Cold welding for aluminum is widely available and does not require special training and complex equipment. The process takes place directly indoors, at room temperature. None of the heat sources used by arc welding are required.

Composition and characteristics

Cold welding, in essence, is and can have a single-component or two-component composition, which includes:

  • Epoxy resins that form the basis of welding and are responsible for the uniformity and ductility of the composition.
  • Metal component as filler.
  • Additional substances and additives that improve adhesion, resistance to aggressive environments, temperature characteristics, and so on.

Strength depends on its composition, correct use and quality of surface preparation.

Under suitable conditions, the joint can be even stronger than the metal being joined, but, as practice has shown, the seam after gluing is an order of magnitude less strong than with traditional welding. Therefore, it is recommended to use it only for minor repairs.

For aluminum" is found in almost every hardware store - a huge number of foreign and domestic producers They produce this composition, which differs from each other only in external design.

Mastic is usually sold in the form of a two-layer bar, which resembles plasticine, or for convenience it is placed in a cylindrical package.

Before welding work cut from a piece (strictly perpendicular) required quantity. After kneading with your fingers, the welding elements are quickly applied to the desired area.

Principle of strain welding

Bonding of aluminum surfaces is carried out due to plastic deformation.

During cold welding, the objects being joined are compressed very tightly against each other, as a result of which the outer layer is destroyed and an intermolecular bond occurs, forming a strong connection.

To ensure better bonding, it is advisable to degrease and clean the parts from dust in advance.

Cold welding methods

Cold joining technology for aluminum can be divided into 3 methods:

  • butt;
  • point;
  • suture

Butt welding

At this method aluminum blanks are placed and clamped into special jaws. Next, a force is applied to them, which is directed along the axis. As a result, the parts come together as tightly as possible, and plastic deformation occurs.

This method has some disadvantages:

  • it is almost impossible to connect long parts, because their size is limited by the design of the clamping device;
  • part of the workpieces located in the clamping sleeve is deformed;
  • difficult to remove parts from clamps.

Spot welding

This method is used for overlapping aluminum workpieces. Special punches are used. The location of the pressed punch is called the weld point. Weld points are placed along the connection line at a certain interval.

The advantage of this method is the absence of the need for preliminary fastening of parts and low metal deformation in the connected places. This is the most common cold welding for aluminum. It can be performed without clamping or on fixed parts.

Seam welding

To form a continuous seam with this welding method, rollers can be used, between which the workpieces to be joined or ring-shaped punches are placed.

Welding can be performed either by one rotating roller, which presses the aluminum parts against a support, or by two rotating rollers, which clamp the parts together.

Depending on the cross-section of the parts, a roller seam can be made on a milling or manual tabletop machine.

With this joining method, a seam without flanging is obtained, but its disadvantage is the thinning of the cross-section of the parts at the seam, which leads to bending and curvature of the workpieces in this place.

This disadvantage can be reduced by increasing the diameter of the working surface of the rollers. Or it is better to avoid using this method.

Aluminum welding technology

Shear welding is a method of cold welding aluminum. It is performed by compression with tangential displacement. As a result this process all oxide films are peeled off, forming connection bridges. This method is used in industrial settings for connecting wiring and trolleybus wires, radio housings, cable sheaths, various frames for household appliances. Excellent result obtained by welding aluminum with its alloys (provided the workpiece surfaces are clean). In case of the slightest contamination, it is almost impossible to achieve a good connection quality.

To obtain good quality connections, sedimentary pressure should be applied so that the metal can flow freely from both sides of the welding site. Only fulfilling this condition will make it possible to achieve the correct displacement of the parts relative to each other.

A seam on sheet aluminum can be made:

  • straight;
  • circular;
  • continuous (any length).

Application and features

Before work, clean the surface using steel rotating brushes. Welding of aluminum can be done with various metals. Welding is used quite often aluminum pipes. IN laboratory conditions A successful attempt was made to weld using aluminum and steel dies.

There is a great future for cold welding. Despite the fact that new methods of using high-frequency current are now being developed, such installations are quite expensive, and their coefficient useful action everything also remains at a fairly low level.

Welding and soldering can be carried out under the influence of induced currents. When welding aluminum with direct current, you can proceed as follows: lower two rods into an alkali solution, then pass direct current. As a result, the negative rod will quickly heat up. Now you should remove the rods and make a draft.

This method is used in laboratories. He did not find his place in industry.

When cold welding is done for aluminum, there is no external heating of the parts. This allows you to connect electrical wires in insulation, carry out work in a flammable area, and seal holes in a container that cannot be heated. In addition, it is possible to combine aluminum with steel. When using cold welding on aluminum, metal waste can be reduced by almost 10 times. Using aluminum welding equipment, copper and titanium are joined together, as well as other metals and alloys that have ductility. To weld aluminum, fluxes are not always needed.

Spot welding can be used to connect sheet metal up to 15 mm thick.

The butt method is used to connect rods with a cross-section of up to 30 mm and wire of the same diameter. High-temperature cold welding for aluminum is capable of joining strips of copper with a cross-section of 100 x 10 mm with a very strong seam.

Seam welding on parts made of sheet material a sealed seam of absolutely any length is obtained

Cold welding of aluminum is intended for stationary conditions. The equipment may have a settling mechanism, a hydraulic drive, or a mechanism for clamping parts.

The composition of cold welding for domestic needs includes fillers and sulfur additives. The polymer composition has a gluing property that appears with slight heating. It can be obtained by kneading a piece of the substance in the palms of your hands for several minutes. Then the mixture can be applied to the joint of the parts.

This is used when performing minor repairs household appliances, plumbing, risers, radiators, windows, mufflers, fuel tanks, etc.

The mass, after setting, can take, if processed, any shape. Complete hardening occurs after 1-8 hours. The parts can then be painted.

Cold welding for aluminum received the most positive reviews from people who have used it repeatedly. Having analyzed them, we can conclude that the durability and quality of the connection, as a rule, completely depend on the chosen adhesive composition and the correct implementation of the technology.

Cold welding of aluminum in St. Petersburg is carried out both in specialized auto repair shops and independently at home. Packaging the material costs from 38-40 rubles.

Best Cold Welding for Aluminum

It is specially designed for repairing units made of aluminum, silumin and duralumin.

Quick-curing cold welding "Polyrem-Aluminium", the formula of which was specially developed for better adhesion to aluminum and its alloys, makes it possible to carry out high-quality and reliable repairs of aluminum parts, without the use of a welding machine.

Using this cold welding, you can effectively and quickly repair:

  • aluminum car fenders;
  • car radiators;
  • pipelines made of aluminum or alloys;
  • auto cylinder heads;
  • body panels and other car parts.

Cold welding for aluminum, the price of which depends on the packaging and ranges from 40 rubles, specifically contains a filler that provides the composition with enhanced adhesion specifically to aluminum and its alloys.

Now you don't have to bother with welding machine- you can simply take cold welding for aluminum, mix the composition with your hands and start repairing.

Aluminum is a very durable, lightweight metal with high environmental resistance, but it is completely non-adhesive. Until recently, gluing aluminum parts was not possible, but thanks to industrial progress that has stepped far forward, this fastening method is gaining popularity, leaving behind various types of welding. Aluminum adhesives contain acids and alkalis in the required quantities, which destroy the metal oxide film, increasing adhesion and increasing the strength and durability of the joint.

This is, of course, a huge plus, because any welding requires professional skills, and we have been accustomed to gluing since childhood. Moreover, aluminum is increasingly used in production: window frames, profiles, pipes, doors, windows, office partitions and much more. The designs are lighter and much cheaper than their analogues.

Types of glue and selection rules

Polyurethane or epoxy based adhesives are optimal for working with aluminum. They contain chemicals that ensure reliable fastening.

Adhesives for aluminum based on polyurethane are classified into:

  • One-component, they contain polyurethane polymer, without solvent. This type of glue is used on open elements that are pre-sprayed with water. By reacting with a wet surface, one-component adhesive bases harden, providing a strong connection.
  • Two-component polyurethane based. Unlike one-component adhesive compositions, this type of glue already contains a hardener and does not require additional manipulations with water. Most often used in enclosed spaces. The composition is resistant to oils, mold, fungi, and also has sufficient heat resistance and high elasticity.

There are also resin-based adhesives for aluminum:

  • Two-component epoxy based. This type of glue has high adhesion and heat resistance, therefore it is most often used for external installation of aluminum structures, or when gluing materials with different thermal expansion - stone, wood, porcelain, etc. It should be noted here that a strong connection between different materials is difficult to achieve. Therefore, it is recommended to use, in addition to adhesive, a mechanical connection, for example: using an elastic band. Resin-based adhesive compositions come in cold and hot hardening and, depending on the application, the required type of gluing is selected. Cold compositions harden at temperatures from +15 to +350, hot ones at temperatures from +1000 degrees and are often used in industrial enterprises.

It should be noted that any two-component adhesive compositions are mixed with a hardener before use, usually in a 1:1 ratio. But sometimes the mixing formula may be changed to achieve a fluid joint, variations of which are indicated on the product label.

When choosing adhesive for aluminum, pay attention to the parameters indicated on the packaging:

  1. Heat resistance, and depending on where exactly the adhesive base will be used, choose the right product.
  2. Water resistance, provided that the base is in contact with water.
  3. Is it possible to mount with different materials?
  4. Curing time, which depends on the composition and temperature of application, and varies from several minutes to an hour.

Be sure to check the tightness of the product and the expiration date.

Motorka.org » Repair » Repair of light alloy bodies

Adhesives for repairing duralumin hulls

The use of glue in the repair (and construction) of duralumin hulls ensures high joint strength, moisture and water resistance, and resistance to gasoline and oil. Being a good sealing material and dielectric, the glue prevents the occurrence of contact and crevice corrosion in the joints of parts.

The most accessible adhesives are based on an epoxy binder, for example, the universal EDP adhesive sold in stores. The packaging set includes an epoxy compound EDP (ED-6 epoxy resin with a plasticizer) and a hardener - polyethylene polyamine. When preparing glue for 10 parts by weight of the compound, it is necessary to measure 1 part of the hardener.

The surfaces to be bonded are cleaned with sandpaper, a wire brush or a file, then wiped with a swab moistened with acetone or gasoline and dried.

The glue is applied in a thin layer using brushes, spatulas or foam rollers. After a short period of 5-10 minutes (“open”) exposure, the parts are folded and tightly compressed using clamps, screws or weights. The glue squeezed out during pressing is removed. For a better fit of the parts and to obtain an adhesive seam with a thickness of 0.3-0.4 mm, it is necessary to provide a pressing pressure of 0.5-1.0 kg/cm2, evenly distributed over the entire surface to be glued. The parts are kept under pressure until the glue hardens completely, which occurs after 24 hours at room temperature (18-25°); At higher temperatures, the curing time is slightly reduced. It must be remembered that the “survivability” of epoxy glue, i.e. the time it retains the best adhesive qualities, is from 30 minutes to 2 hours. When preparing a portion of glue, you need to take this into account and determine its quantity based on the approximate consumption rate of 0.04 g/ cm3 for one-sided application and 0.06 g/cm2 for double-sided application.

In cases where it is necessary to fill the gaps between parts, a filler is introduced into the glue - aluminum powder, metal filings, asbestos, talc, tooth powder or ocher (dry). When adding filler, you need to ensure that the glue remains fluid and is easily applied to the surfaces of the parts to be glued.

Using a filler adhesive, you can seal small dents, minor cracks and pits in sheathing and deck sheets. After the glue has cured, the surface is leveled and painted. To better guarantee tightness in case of through cracks in the bottom, it is useful to additionally seal the repaired area with a patch made of thin durable fabric.

Guide to boats, boats and motors. Edited by G. M. Novak.

How to glue aluminum?

Gluing aluminum with adhesives

“Glue for aluminum MASTIX” is intended for quick and reliable gluing, repairing parts and assemblies, sealing joints and containers, for restoring lost fragments of products made of non-ferrous (aluminum) and ferrous metals, plastics, ceramics, wood in various combinations. The operating temperature of repaired products is from -60ºС to +150ºС. Provides reliable repair on damp and oily surfaces, at low (down to -10°C) temperatures (provided the mixture is mixed in a warm room).

Mode of application

  1. The surfaces (areas) that need to be joined must be cleaned of dirt and rust, be sure to be cleaned with coarse sandpaper (for metals), degreased (with acetone, etc.) and dried.
  2. Cut off at least 1/3 of the volume of the rod and thoroughly mix both components with your fingers (if wet) until the mass is uniformly colored.
  3. Apply the resulting mixture to the surface to be repaired. When gluing parts, apply plasticine to both surfaces to be joined, press and fix for 10-15 minutes.

    How and how to glue aluminum to aluminum. Types of cold welding

    When used on wet or oily surfaces, the mixture must be smoothed using back-and-forth movements until it feels like it is sticking to the surface (at the same time, the bond strength is reduced by 20-25% for oily surfaces).

  4. If repairs are necessary low temperatures It is recommended that after completing steps 1 and 2, roll the resulting mass into a ball and hold it in your hands until it warms up to +40-50°C (but no more than 4 minutes from the start of stirring), and only then apply it to the area to be repaired . It is recommended to use less than 1/3 of the total mass.
  5. To smooth the surface and give it the required shape, use flat objects moistened with water.

Attention!

  • The pot life of plasticine is 5-7 minutes at +20°C. Under conditions that ensure the removal of generated heat (thin layer, low temperature, etc.), the pot life time increases; when heated, it decreases.
  • Plasticine sets in 10-15 minutes at +20°C. At this time, mutual fixation of the parts being connected is necessary.
  • After 1-1.5 hours, the connection can be machined and loaded.

Security measures

Do not allow the components of the refill to come into contact with your eyes or skin. To avoid contact with skin, use protective gloves when working. In case of contact with eyes, rinse them with water and consult a doctor. Do not use on surfaces in contact with food.

Important

If, as a result of storage for more than 18 months or sharp fluctuations in storage temperatures, the outer layer of the cold welding has hardened, heat the cold welding to +60 C. You can use heating radiators for this, hot water, car engine top cover, etc.

Compound

Epoxy-dian resin up to 20%, amine hardener up to 8%, plasticizer up to 1%, hardening accelerator up to 2%, kaolin up to 35%, chalk up to 30%, aluminum powder up to 5%.

Guarantee period

Guaranteed shelf life is 18 months from the date of manufacture.

TU 2252-023-90192380-2011

Dispose of as household waste.

Storage conditions

Store in a dry, dark place at a temperature not exceeding +35°C.

How to glue aluminum to aluminum

High adhesion of the adhesive ensures an exceptionally strong connection of aluminum structures.

Scope of application of adhesive compositions

  • gluing metal corner joints in the door, window, and facade industries;
  • used for power connections of RVs when one of the components to be connected is fiberglass plastic;
  • a number of other manufacturing industries where metal parts are fastened together.

Applying glue for aluminum

The surfaces are pre-cleaned and degreased with special means, the adhesive composition is applied in a thin layer and the elements are pressed tightly against each other for several seconds. If in the future the connected parts will experience mechanical loads, application is made to almost the entire gluing area.

Determine the duration of action of glue for aluminum, taking into account temperature, humidity, type of surface and some other factors.

Advantages of the composition

  • ease of use, some types of products are equipped with special attachments;
  • weather resistance;
  • glue for aluminum does not spread, does not contain solvent impurities;
  • After hardening (about 16 hours), the connection can be painted or undergo other types of processing.

Cosmofen DUO adhesive is used for structural fastening and sealing of metal aluminum, anodized, spray-coated frames and profiles in the manufacture of windows, doors and facades.
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A quick-drying cleaner with an antistatic component, used for cleaning aluminum surfaces and planes.
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Cosmofen CA 12 (20 grams)


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Cosmofen CA 12 (50 grams)

One-component cyanoacrylate composition with high initial adhesion, good adhesion to a wide variety of materials, particularly high shear and peel strength, durability, water resistance, temperature and chemical resistance.
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Cosmoplast 500
A one-component instant adhesive based on cyanoacrylate, used both in industrial production (metalworking, plastic processing, sealing) and in everyday life.
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Cosmofen HDP 900 – dosing gun

Reliable manual dispensing gun for Cosmofen DUO glue in double tubes 900 g.
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