DIY solder for brass. Soldering brass - a reliable connection at home

Brass parts, unlike steel, are easy to process, and it is thanks to this useful quality of the alloy that it becomes possible to solder brass at home, without resorting to industrial methods. To create a wide variety of things, soldering is required - connecting wires and metal parts. To do it correctly, you need a gas burner, a graphite crucible, an asbestos base, as well as silver, copper and boric acid.

Soldering brass is much easier than soldering steel, which allows it to be done at home.

Preparation for soldering brass products

To clean the alloy, you can use oxalic acid. If you don’t have it at hand, you can look at various household products. They are applied to brass products, after which it will begin to darken quite quickly. Then you can get rid of the deposits by taking a fine brush and brushing the parts in ordinary water. After this, you will need soda, which is poured into the brass product. After a few minutes, the soda is washed off. If oxalic acid is present, it is diluted in proportions of 20 grams per liter of hot or cold water. It is not recommended to breathe over the solution, and you should also protect your hands with gloves. The container must be plastic to avoid exposure to other metals. Once the brass part has been processed, it should be wiped down and dried.

Oxalic acid is used to clean the alloy.

To solder brass most effectively, you should not use regular tin soldering, since its use leaves quite noticeable marks. In addition, it cannot boast of great strength. In order to solder brass, it is recommended to use another method that provides increased reliability. Effective and reliable soldering of brass parts is ensured by the use of a gas torch. To make solder from brass, you should take copper and silver in proportions of 1:2, mix thoroughly and fuse together using a graphite crucible and a gas torch. The crucible is placed in a container with cold water, and only after this is it possible to remove the molten and solidified solder. It must be flattened and cut or ground into shavings, which can be done with a large file. After this, you will need borax powder and boric acid, each ingredient should weigh 20 grams. Based on these substances, flux is produced. The resulting powder mixture is poured with a quarter liter of water.

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Solders for soldering brass parts

Soldering gas burner must be done very carefully, maximum temperature at 700 degrees.

Brass parts that require soldering are placed on an asbestos base. The connected parts are sprinkled with solder, cut into small pieces and pre-sharpened. The joint is then gently heated using a gas torch. This work must be done as carefully as possible. When soldering parts, the temperature should gradually approach a certain level. The maximum permissible level is 700 degrees, but if you exceed it, you may encounter hopeless damage to all parts. When it is necessary to solder large and massive parts, their heating should be gradual to avoid negative consequences. When soldering small and thin parts, the heating process occurs in a very short time, so it is important to treat it carefully.

Of course, conventional soldering with tin is much simpler than a similar method, but it is thanks to it that the reliability and strength of the soldering of brass parts will be much higher. It is important to remember some features of brass soldering, such as the evaporation of zinc when it is very hot. In addition, the surface of the alloy is covered with an oxide film. Brass, which contains less than 15% zinc, is oxidized and becomes coated with a film containing interlocking particles of copper oxide and zinc oxide. Copper alloys, which contain much larger quantities of zinc, oxidize to form a film consisting mainly of zinc oxide. The problem with such alloys is that copper oxide is removed more easily and quickly than zinc oxide.

The finished product is washed with hot 3% sulfuric acid.

If conventional low-temperature soldering is carried out using solder containing lead and tin or other tinols, the oxide film must be removed from metal surfaces. Here it is possible to use rosin-alcohol or more active fluxes. To process brass with a high zinc content, for example, L63, it is necessary to use a flux that contains zinc chloride. It is important to remember that brass has some of the worst melting properties with tin-lead solders. This feature leads to the fact that intermetallic layers slowly begin to grow during the soldering process. They have a positive effect on the seam and improvement can be expected mechanical properties metals

You should not hope that soldering, which uses tin-lead solders of L63 brass, will lead to high-quality connections. Their adhesive strength and quality will be inferior to copper if the conditions are the same. The tensile strength indicator for copper parts soldered with tin will reach 90 MPa, and for brass parts it will not reach 60 MPa. Soldering of brass parts containing great content copper, can be done with solders PSR 72, 45, 25 and 12. Sometimes in such cases it is permissible to use copper-phosphorus brass or a brass alloy that melts at a low temperature. This is mainly applicable to gas soldering.

At high level zinc, it is possible to use PSR 40 solder. The use of phosphorous solders is completely unsuitable, because there is a high probability of a solder joint having low ductility. This is explained by the formation of zinc phosphides, which are distinguished by their fragility. Hard solder is also very common, used when joining large products, for example, for working with brass and copper pipes and heating systems in general. The advantage of hard solders is high strength obtained compounds.

Soldering brass with a gas torch, tin, tin-lead and other similar solders is very common, although many do not dare to pick up the appropriate tool. Below we will discuss all the intricacies of this process, areas of application, as well as ways to carry it out yourself at home.

1

Soldering is one of the ways to obtain a permanent connection. It is carried out by introducing molten solder between two elements. This means that the melting temperature of the latter should be slightly lower than that of the materials of the main parts. Using this process, dissimilar metals can be joined together, and in some situations this is the only way possible way fastenings

Many people equate this combination of metals with welding, but what they have in common is only the end result. The essence is completely different. Their most important difference is that when welding work melting of the base material occurs. In soldering, only the metal bond melts, so that the integrity of the processed parts is completely preserved. Thanks to this, it becomes possible to work with fairly small elements without worrying that they are deformed, and the structure and properties of the materials being soldered will remain the same.

However, it is worth considering that compared to the same welding, the connection will be less strong. This is due to the softness of the solder, but if we are talking about brass products, then this material when exposed to high temperatures, it releases zinc, and the seam becomes more porous, which also negatively affects the adhesion strength. Moreover, the location of the elements also plays a role, so butt soldering is quite unreliable, it is better to do it with an overlap.

Today, it is soldering that occupies one of the leading positions in the creation of permanent connections, second only to . Thus, it is very difficult for electronics engineers who are forced to work with rather fragile microcircuits to imagine their profession without the participation of this process. In addition, solder joints are also very relevant in electrical applications, if you need to extend or simply connect wires.

This method is also used to make connections in refrigerators, heat exchangers and other installations. Very often it is used for fastening plates made of hard alloys to cutting tool. You can also attach thin-walled parts to a thick sheet. In addition, sometimes anti-corrosion treatment is carried out using tinning. In general, the scope of application is quite wide.

Soldering can be high or low temperature. In the first case, the connection is more reliable, plus it has increased thermal stability (this is due to the fact that solders for this type of processing have high temperature melting). Thus, parts after such exposure can operate at much higher temperatures compared to parts connected in the second way. However, this type also has its disadvantages, since we are talking about excessively high temperatures, then this process A simple soldering iron will not work. It requires special equipment, which greatly complicates the work.

2

Most often, you have to work with a soldering iron on an alloy of copper and zinc called brass. This material is predominantly found in industry and household, so radiators, pipes and many other products are made from this material. Therefore, let's look at the features of working with it. Firstly, it is very important to choose the right flux for soldering brass. After all, ordinary rosin-alcohol is unable to remove the oxide film from its surface well, so it is necessary to use more active components, the basis of which can be zinc chloride.

For soldering elements in salt baths, fluxes containing borax or potassium fluoroborate have been used. Typically their content in the solution is about five percent. They promote better flow of the binder component into the gaps.

Secondly, special attention should be paid to selecting the solder for soldering brass. Silver and copper-phosphorus components are ideal for gas environments. They are also applicable for working with brass, where there is a high copper content. In the latter case, even brass can be used as solder, but its melting point must be significantly lower than that of the main alloy from which the parts are made. Brass brazing is very common. So, for example, to connect radiators, copper pipes and other elements heating systems L-CuP6 is used. In general, hard solders are superior to soft ones, since the joint strength will be greater.

It is also important to consider the situation when the material of the parts being connected is different, for example, how copper is soldered to brass. At home, this process is quite feasible, the main thing is to know some of its features and what kind of solder should be used. When heated, an oxide film forms on the surface of brass, and excessive heat also contributes to the evaporation of zinc from this alloy, which enters the liquid metal binder. In this regard, the seams become more porous, which contributes to the deterioration of adhesion strength.

Moreover, due to of this property High-temperature soldering is very rarely used in special furnaces. What about soldering in gas environments, it is better to do this using flux, but if this is not possible, then a layer of nickel or copper should be applied to the surface of brass parts. Such a solution will avoid the release of zinc and, accordingly, the connections will be more reliable. Some solders contain substances that also act as flux, which makes the job easier because you don’t have to juggle a lot of components while working.. An example is copper-phosphorus solder.

3

Having studied all the features of the process and become familiar with all possible components, you should pay attention directly to the question of how to solder brass. After all, it occurs very often in our everyday lives, and the budget does not always allow for hiring specialists, so we have to cope on our own. Moreover, all we need is:

• gas burner (sometimes you can get by with a simple soldering iron),
• solder,
• flux,
• borax.

Without the last two elements, the seam, of course, will work, but it will be quite weak, white, and the folds, if any, can come apart very quickly.

So, let's start collecting everything you need. This list includes: gas torch, asbestos base, graphite crucible, borax, solder and boric acid. Solder is prepared as follows: take one part copper and two silver, then put them in a crucible and melt them, heating them on a gas burner, not forgetting to stir. Once the mixture is homogeneous, place the container in cold water so that the contents cool down. Then it can either be cut or used in the form of shavings.

To make flux, you will need a drill for brass soldering and boric acid, which are taken in a 1:1 ratio and filled with water. So, taking 20 grams of each component, you will need 250 ml of liquid. Now let's proceed directly to the process. We take the parts, treat their surface with flux and sprinkle with solder shavings. Then we bring it to a gas burner and heat it up to about 700 °C. Beware of overheating, because thin brass parts heat up very quickly and can become deformed. Massive elements must be heated gradually. Soldering can be considered complete. Of course, this procedure is much easier to do with a soldering iron, but it is more reliable with a torch.

Brass is widely used in everyday life, and the question of how to solder brass is very important for some. Repairing many home appliances depends on what you use to solder the metal. This process is noticeably different from joining other metals. It has a number of specific features and causes certain difficulties. However, if certain conditions are met, then soldering will be within the capabilities of any person.

Brass is widely used in everyday life, and when brass products break, the question arises of what to solder it with.

Features of soldering copper alloys

Often used in everyday life various details, in which brass and bronze are used. These copper alloys are very similar in appearance, but have different composition and its own characteristics. Brass is a copper-zinc alloy with the addition of tin, aluminum and other metals. Bronze is an alloy of copper with tin, aluminum, lead and other substances. Brass, to which tin is added, approaches the composition of bronze, but still its basis is zinc.

Materials and tools for soldering brass products.

It has its own characteristic difficulties. When exposed to heat, zinc actively evaporates from the alloy, forming a dense film of zinc oxide and copper. The zinc oxide film is destroyed with great difficulty, and its formation occurs quite quickly when the zinc content in brass is more than 15%. Rosin, even in combination with alcohol, cannot cope with such a film, which requires the use of special fluxes.

If you use tin-lead solder when soldering brass, the connection has low mechanical strength. Thus, where brass is soldered with tin-lead solder, its strength is 1.6 times less than that of copper. This is due to the appearance of pores in the soldered seam due to the evaporation of zinc.

Methods for soldering bronze depend on its composition. Tin and nickel bronzes are easily soldered with tin-lead solders. When soldering aluminum and beryllium bronzes, difficultly soluble films arise, which necessitates the use of special solders and fluxes.

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Fluxes for metal soldering

To solder brass you will need borax, a special flux.

Fluxes are designed to remove films from the surface of metals being soldered and protect against the formation of new films in the soldering zone. While rosin is sufficient for joining copper, brass requires a different, much more aggressive flux. The flux composition required for different brasses is different, which is caused by the introduction of certain metals into the brass composition. For common brasses such as LS59 and L63, the use of zinc chloride with a small content of boric acid is sufficient. When soldering brass with additions of lead and silicon, for example, brass type LKS80, a flux based on a compound of potassium with fluorine and boron or based on borax is recommended.

At home, you can make the following flux, which is suitable for most brass. It is necessary to prepare 20 g of powdered borax and 20 g of powdered boric acid. Dry powders are mixed well and poured with 200 ml of water. The mixture is then boiled and cooled.

From ready-made compositions As fluxes for brass, we can recommend: domestic ones - “Bura” flux; fluxes PV-209 and PV-209X. Of the imported ones, German-made fluxes should be noted: Chemet FLISIL-NS-Pulver and Chemet FLISIL-NS-Paste flux paste.

Bronze can be soldered using a flux made from chloride salts (for example, zinc) with the addition of of hydrochloric acid. If soldering is performed at high temperatures, it is better to use boric acid in combination with chlorates and fluorides. To connect aluminum and manganese bronzes, you will have to use active fluxes made from orthophosphoric or hydrofluoric acid. Of enough available funds Phosphoric acid is usually used.

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Solder for brass should be copper-phosphorus. solders

Solder is a metal that, in a molten state, is introduced into the metals being soldered and, after cooling, connects them. Consequently, it must have a melting point significantly lower than the melting point of brass and at the same time have good adhesion to it, being in the form of a melt. Conventional alloys of tin and lead should be used in brasses only when connecting non-critical parts where there are no requirements for mechanical strength and appearance.

The composition of the solder used depends on the type of brass. If the copper component predominates in brass, then you can use silver solders from PSr12 to PSr72, solders containing brass from PMC36 to PMC54 and copper-phosphorus solders. If the zinc content predominates, silver solder of at least PSr40 should be used. The use of phosphorous compounds leads to a noticeable decrease in the mechanical strength of the joint due to the formation of fragile zinc phosphorus compounds. Cheaper brass-based solders such as PMC can only be used in parts that do not experience vibration and shock. When joining with silver and phosphorous solders, brass dissolves quite strongly, which should be taken into account and reduce the time of soldering and heating of metals.

To repair and join permanently fixed parts (for example, radiators or pipes), special hard solders with complex composition. Good results are shown by L-CuP6 type solder, which has a melting point of about 730°C.

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Making your own solder

Silver solders are also suitable for packing brass.

In order to solve the problem of soldering brass, you should prepare the necessary solder with your own hands. Silver solder is most suitable for all brasses; it should be prepared. Melting of metals must be carried out in a crucible that can withstand significant thermal influences. Most simply, such a crucible is made from contact carbon elements for trolleybuses. Burnt elements are quite accessible and can be useful for a crucible. A recess measuring approximately 2x2 cm is made in such a graphite element, and a groove about 5 mm wide is machined into the recess (to facilitate removal of solder).

Solder requires silver and copper in a 2:1 ratio. Measured required quantity metals and is lowered into the crucible. Using a gas burner, metals are melted in a crucible. To simplify the melting process, the metals should first be crushed as much as possible. The melt is mixed with a steel or ceramic (porcelain) rod. After cooling, such an alloy can be used as solder.

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Soldering with a soldering iron

A soldering iron for soldering brass must have a power of at least 100 W.

A sufficiently high quality of connection using low-temperature soldering is achieved when soldering brass and copper or when soldering brass with a predominant copper content. In this case, it is enough to use a soldering iron with a power of 100 W. Soldering or phosphoric acid can be used as a flux. Before soldering, it is necessary to carefully treat the surface of the brass to remove the oxide film and degrease the surface. Tin-lead solder not lower than POS60 is used as solder. Soldering is carried out when the metal soldering zone is well heated with a soldering iron.

You can solder brass with a soldering iron and use silver solders no lower than PSr40. To do this, you will have to arm yourself with a powerful soldering iron (0.5-1 kW). As a flux, it is necessary to use concentrated orthophosphoric acid or borax-based flux. The heating temperature of the soldering zone should be no lower than 500ºС. Before soldering, care should be taken Special attention thorough surface treatment with flux. The treatment should be carried out immediately before applying a heated soldering iron with solder. In this way, you can melt defects in solid brass products (for example, radiators).

Soldering with brass belongs to the category of high-temperature soldering (its melting point is 880-950°C). It is used in cases where there is a need to obtain more strong connection than when using soft solders. Also, the advantages of this type of soldering are the resistance to high temperatures of the resulting joint and the absence of changes in the structure of the metal (which is inevitable when using welding).

Compared to other refractory solders (silver, copper-phosphorus), this alloy is the most durable and high-temperature. Due to the presence of zinc in its composition, brass has increased resistance to environment, slightly susceptible to corrosion. Tin, which is part of some types of brass, increases fluidity and lowers the melting point, and silicon prevents zinc from oxidizing and evaporating.

These solders are used exclusively for steel, copper and tin bronze (with a tin content of up to 8%).

A regular soldering iron is not suitable for this type of soldering. You need equipment that can heat the product to a temperature slightly higher than the melting point of brass (900-1000°C). In most cases, a variety of gas-flame burners and furnaces are used. A significant disadvantage of using burners is the speed and unevenness of heating. Combined with the property of brass in its liquid state to penetrate the grain boundaries of steel (which can cause brittle fracture under stress), this contributes to the formation of cracks. The likelihood of their occurrence becomes significantly lower in furnaces or in salt baths, where uniform heating of the soldered products is ensured. Repeated soldering in any case increases this danger.

Borax is used as a flux, mixed with boric acid in a 1:1 ratio and filled with water (for 20 g of each component you need to take 250 ml of liquid).

Brass soldering technology using a gas flame torch

1. First of all, it is necessary to clean the joints of the parts. This is done in order to remove a persistent oxide film that flux cannot remove. To do this, use metalworking tools (files, scrapers, needle files and hacksaws).
2. Connect the parts using a vice (or any other way).
3. Coat the soldering area with flux, which will remove the oxide film from the metal and provide better adhesion.
4. Light the burner, adjust the flame with a slight excess of oxygen (to prevent oxidation of the metal surface).
5. Heat the tip of the solder and dip it in flux (if the solder was not fluxed initially).
6. Heat the product evenly at the joint until cherry color.
7. Melt the solder at the soldering point (if there was sufficient quantity flux, it will easily spread and tighten the joint).
8. Let the solder harden.
9. Clean the junction.

Brass as a material has been known for quite a long time. Good physical and Chemical properties allowed it to become widespread. Brass parts also periodically develop defects (cracks, holes, breaks). These problems can be solved by soldering. To get the result High Quality it is necessary to have a good knowledge of the composition of brass, physical and chemical characteristics, how to carry out soldering, what solders and fluxes are used to carry out such work.

Basic information about brass

Brass can be double or multi-component in composition. It is always based on two metals: copper and zinc. In this alloy, zinc serves as the main alloying component. To impart different properties, various metals are added to its composition: tin, lead, manganese. Therefore, it is very important to know what composition of brass you have to work with. This is necessary to determine the conditions and specifics of soldering.

Modern brass is classified according to the following indicators:

Depending on the chemical composition:

• Two-component alloys. It contains only two metals, zinc and copper. The percentage of each may vary. This type is marked with the capital letter of the Russian alphabet “L” and a number. The number indicates what percentage of copper is contained in the alloy. For example, grade L85 - this alloy contains 85% copper and the remaining 15% is zinc.
• Multicomponent. They are also called special. Such alloys contain a large number of additives They are marked with two capital letters and numbers. For example, brand LA77-2. She indicates that the composition includes 77% copper, 21% zinc and 2% aluminum. Therefore, very often special brasses get their name depending on the name of the alloying element with the highest percentage (aluminum, tin, nickel, manganese, and so on).

By degree and quality of processing:

• Deformable. These include brass in the form of wire, round tube, sheet and tape.
• Foundry. This is the fittings finished goods made from brass.

• If the zinc content is in the range from 5 to 20%, then such an alloy is called red brass (tompak).
• If this percentage ranges from 21% to 36%, the brass is called yellow.

All brands of brass have similar properties. They are easy to process, have high anti-corrosion characteristics, and have sufficient strength. With a significant decrease in temperature, they retain their plasticity.

These properties have determined the wide range of uses of brass.

Application of brass

In addition to those listed positive properties, brass is a very durable and reliable alloy. Brass is used in the following areas:

• Manufacturing pipeline fittings(adapters, valves, pipes).
• Plumbing fixtures (taps, mixers, washbasins)
• Furniture fittings (handles, latches, locks, decorative overlays).
• Production of electrical parts.
• Production of souvenirs.
• Production of tableware.
• Art casting.
• Jewelry production. Jewelers mainly use two-component alloys. It can be: yellow, red, green or golden brass.

Solders and fluxes: classification and selection methods

For getting good results When soldering, additives in the form of fluxes and various solders are necessarily used.

Solder is a specific metal that, after melting, penetrates into metals prepared for soldering.

To achieve reliable contact, the brand of solder must have a melting point that will be significantly lower than the melting point of the brass itself. At the same time, it must have good adhesion to brass. Therefore, special solders are used for soldering brass.

Only as a last resort, if parts are soldered that do not bear much responsibility for the entire unit, and there are no high requirements for strength, ordinary tin-lead alloys are used.

Modern solders are classified as follows:

• By melting point. They are soft with a melting point reaching 400°C; semi-solid with the melting point of tin and solid. The melting point of hard solders exceeds 500 °C.
• By type of melting. Solders that melt completely or partially during the soldering process.
• According to the method of obtaining solder. We produce ready-made solders, and solders that are formed during the soldering process. This type of soldering is called contact reactive soldering.
• According to the list chemical elements, added to the composition. A fairly large number of such elements are used. From common metals zinc, tin, aluminum, to rare earth metals gallium, indium, palladium.
• According to solder manufacturing technology. They are: wire, stamped, rolled, cast crushed.
• By type of solder. They are produced in the form of wire, ready-made powder, in the form of tape and individual sheets, in the form of tablets and ready-to-use embedded parts.
• According to the method of flux formation. Solders are divided into two large categories: fluxed and so-called self-fluxing.

Solders, like brass, are marked with capital letters and numbers. By the marking you can determine which brass a particular solder is intended for. For example, if it is necessary to solder a part made of brass, in which there is a large percentage of copper, then it is proposed to use solder of the PSr12 or PSr72 brand. This solder contains a large percentage of silver. If there is a large percentage of zinc in brass, then it is advisable to use PSr40 solder. Therefore, in order to obtain a reliable connection after soldering, it is necessary to understand what loads are placed on the part being repaired. If the part is stationary and does not bear large vibration loads (for example, plumbing elements), you can safely use PMC solder. If it is necessary to ensure a strong connection, special hard solders are used, such as L-CuP6. This solder has a very high melting point - 730 ° C.

To choose the right brand of solder, you can use the following method:

• Determine the melting temperature of the parts that are planned to be soldered.
• Determine the coefficient of thermal expansion. For brass that you plan to solder and the solder it should be very close.
• After soldering, the solder should not reduce mechanical characteristics repaired part.
• The solder must form a galvanic couple with the main brass part. If this is not ensured, the corrosion process will quickly occur.
• The properties of the solder must comply with all technical and operational characteristics.
• The solder must ensure good wettability of the main part during the soldering process.

Flux is a special substance that allows you to prepare the surface of the metal, that is, remove the resulting oxide deposits, grease and water stains from it. Without the use of flux, it is impossible to qualitatively solder a brass part. Fluxes are selected depending on the chemical composition of brass.

Experience shows that in order to qualitatively solder parts made from common brands of brass LS59 and L63, it is enough to have a flux consisting of zinc chloride dissolved in boric acid. If you need to solder brass, which contains lead and silicon (for example, LKS80 brand), then you need a flux containing fluorine and potassium compounds. They are also dissolved in boric acid, or borax. A similar one can be prepared at home, using the appropriate elements in the required percentage.

Today, the industry offers ready-made fluxes for brass soldering. These include: Borax flux; fluxes PV-209 and PV-209X.

Soldering methods

The brass soldering process has certain specifics. The brass heats up and the hot zinc elements evaporate. At this moment, an oxide film is formed, which is quite difficult to remove from the surface of the part and thereby deteriorates the quality of soldering. Usually brass is soldered in two ways: using a soldering iron and using a special torch.

Soldering with a soldering iron

To successfully solder brass, a soldering iron must have a power of at least 1000 W. Such a soldering iron will provide the required heating temperature for the parts themselves and the solder. It should be 500ºС and above. Low temperature soldering of brass is only possible if it has a high percentage of copper content.

The most convenient way is to solder using soldering station, which has temperature adjustment of the soldering iron tip. This adjustment allows you to set the optimal heating mode. The point is that during soldering it is necessary to avoid unnecessary overheating of the soldering area. The optimal temperature for heating the soldering iron tip is up to 350°C.

Soldering using a gas torch

The task of soldering brass can be solved using a small torch. The brass part is placed on any heat-resistant material; it must withstand high temperatures. Asbestos plates are used for these purposes.

The parts that need to be soldered are placed on this plate and aligned with each other. Preparation for soldering is the same as when soldering with a soldering iron. Next, the solder is cut into small metal chips or shavings and sprinkled on the joint of the parts. Then adjust the size of the burner flame and bring it to the soldering zone.

First, it is necessary to slightly heat the soldering area so that the solder sticks to the surface of the brass. After this, complete heating is started until a characteristic red color appears on the surface of the brass. With a correctly adjusted burner, the temperature in the soldering zone reaches 700 °C. After cooling, it is necessary to remove sagging and flux residues.

So, in order to get good results when soldering brass parts, you need to choose the right solder. Monitor the cleanliness of the soldering iron rod and the degree of its heating. You should never start soldering if the soldering iron has not reached the required temperature. Carefully prepare the surfaces of the brass part that you plan to solder (wipe off dirt and dust and degrease). Carefully monitor the degree of heating working area soldered parts.