What material is used for welding copper pipes and pure aluminum pipes?

Copper tube and pure aluminum, brass tube and pure aluminum can be welded with Viodin electrode copper and aluminum welding wire, refer to this welding special "mainstream copper and aluminum welding method summary" question to learn from it should be helpful to you.

Method 1: ALCU-Q303 copper-aluminum welding rod solves copper-aluminum welding.

Description: A kind of copper and aluminum welding wire of self-brazing fluoride agent, in the process of welding, because there is no need to use any welding powder and flux, it is favored by the operator, in the case of the temperature of the base metal reaching 400 degrees, the end of the flame is slightly burned with the welding wire, and the molten welding wire will flow in water under the action of the powder. Because of its very good fluidity, it is especially used in the refrigeration industry, such as the socketing of copper and aluminum tubes, and the socketing of aluminum tubes and aluminum tubes.

In addition, in the transformer industry, the lap of copper and aluminum conductor bars, corner joints are also used a lot, how to make the connected conductive bars can work in a high-voltage and high-current environment, the compactness of the welding layer is particularly important.

Method 2: WE53 solid brazing metal solves the welding of all white metals, but aluminum alloys are used more, especially including aluminum alloy and various cast aluminum welding, including copper and aluminum welding, aluminum and iron welding, and dissimilar welding between aluminum and stainless steel.

Description: Because WE53 is a solid welding wire, WE53 low temperature aluminum welding wire has two ways to operate.

Welding method without solder powder: no need to use any solder powder and flux in the welding process, mainly used to solve the welding of aluminum alloy, and the welding of products with special requirements for deformation is very suitable. When the temperature of the base metal reaches 400 degrees, the weld is formed by wiping the weld with WE53 like a rubber.

In the auto repair industry, it is particularly used in the repair welding of the root of the water tank and intercooler, the repair welding of the air conditioning pipe, the repair welding of the pipeline with a bad angle of the refrigerator, and the repair welding at the junction of thickness and thinness.

Method 3: M51+M51-F low-temperature copper-aluminum electrode, solve low-temperature copper-aluminum welding at 179 degrees.

Description: It belongs to low-temperature brazing copper and aluminum welding, for particularly thin, and even some exaggerated thin cases, it is most suitable to use this kind of welding, but field experience proves that the welded product must have a welding angle, if the welding angle is not good, the welding effect will be discounted, because the principle of this copper and aluminum welding wire is completely formed by the heat conduction of the base metal, and the angle is not good to burn the welding wire and flux, which will lead to welding failure. It is mainly used in irregular welding, which is best to be formed at one time, as well as the welding of copper and aluminum enameled wires, which is especially used in the lead wires on electronic products and motor products.

You can use silver electrodes.

How to weld copper and iron interfaces?

The similar welding in the factory is very beautiful, I don't understand it, and I can't find the information. The following is a description of my own experience, which I hope will be helpful to my colleagues who are new to the industry.

The main difficulty of welding copper-iron interface is that the affinity of iron to copper-silver electrode is not enough, and the welding liquid is non-sticky iron after baking red iron pipes.

Netizens who know a little welding knowledge know that in fact, the affinity of phosphor copper electrode to iron is very good, and phosphor copper electrode can form a very beautiful mirror surface when borax welding iron.

But the melting point of iron and copper is not the same, when we use phosphor copper to weld the interface between the copper pipe and the iron pipe, we will find that when the temperature of the iron pipe rises to the point that it can dissolve the phosphor copper electrode, the copper pipe has reached the melting point. If you lower the temperature, it's easy to honeycomb.

What to do? Actually, let's just think differently, and here's how I did it:

First, the iron pipe that needs to be welded is sandpapered clean, and then the phosphor copper welding rod is glued with borax and welded 1cm away from the nozzle for a thin circle, taking care not to miss the welding. After that, use a file to process the high place, and use sandpaper to polish the flux clean;

Of course, it is not easy to put the iron pipe welded with brass into the copper pipe, so you can use a hole reamer to expand the copper pipe appropriately and put the iron pipe into the copper pipe;

Now we can weld the copper-iron interface with silver-copper electrode like welding copper pipes, because the iron pipes have been welded with copper in advance, and after the interface is baked enough to meet the temperature, we will find that the welding is not difficult at all.

The welding methods of aluminum and copper pipes are as follows:

Welding process: brazing process, oxy-propane (natural gas), oxy-acetylene, petroleum liquefied steam flame brazing.

Welding tools: gas cylinders filled with petroleum liquefied gas, brazing torches.

Pre-welding treatment:

1. Welding of copper and aluminum pipes.

a. Joint design: the unilateral clearance of the joint should be controlled, and the length of the weld is generally not more than 30mm.

b. Surface treatment: use lye or metal cleaning solution to clean off the oil and other dirt at the welding place of the joint, and then scrape off the insulation layer on the surface of the joint welding with a scraper (or coarse sandpaper, or copper brush, or steel wire brush).

Note: It cannot be polished, because the brazing metal is welded by capillary action, which is not conducive to welding after polishing.

2. Welding of copper bar and aluminum bar (or copper wire and aluminum wire): use lye or metal cleaning solution to clean off the oil and other dirt at the welding place, and then use a copper brush (or wire brush, or scraper, or coarse sandpaper) to scrape off the insulation layer on the surface of the joint welding.

Note: It cannot be polished, because the brazing metal is welded by capillary action, which is not conducive to welding after polishing.

Flame control and heating:

1. Selection of tools:

Priority is given to the evenly heated air-fueled welding torch (the welding torch is equipped with an airflow control valve and a rotating device, and the flame rotates out through the welding nozzle, and the flame is evenly discharged), and the reducing flame (the flame of natural gas and petroleum liquefied vapor combustion) is preferred.

2. Heating method:

The flame should be soft and completely cover the welded area. The flame should be moved up and down and left and right with the connection area as the center, so that the connection area is heated evenly (when different metals are connected, more metals with good thermal conductivity should be heated.) For example, when copper and aluminum are welded, the copper parts should be heated more to ensure that the temperature of the connected parts is consistent).

3. Welding wire filling method:

While heating. The workpiece in the connection area can be touched with the cored wire (the welding wire is melted by the temperature of the workpiece, the welding effect is better), when the welding wire can be melted, the welding wire should be fed immediately, and the heating should be stopped to avoid overburning and damage to the base metal.

Feed the wire until the melted filler fills the weld (since the melted filler metal penetrates into the weld by capillary action, the feed wire can be stopped when the weld is filled with brazing filler to avoid unnecessary waste).

4. Cooling method:

Removing the torch after welding is complete allows it to cool naturally. Note: When welding, avoid the flame being aligned to a certain point for a long time and the welding temperature should not exceed 630 to avoid burning out the base metal.

Safety warning: Protective clothing, protective gloves and protective glasses (or protective masks) should be worn for brazing work, and beware of liquid flux splashing on the ** and causing burns.

After soldering and cooling, no further treatment is required, and the flux residue is visible but non-corrosive, does not absorb moisture and adheres firmly. If necessary, it is recommended to use physical methods to remove it, such as soaking it with a metal brush (if there are small burrs, it can be sanded off with fine sandpaper).

Copper-aluminum brazing method:

1. Thoroughly remove the oil, dirt, and insulation layer on the base metal;

2. When welding, the base metal is heated first, the thick parts are heated first, and then the thin parts are heated.

3. Heat the copper parts first, then the aluminum parts;

4. When the temperature of the weldment reaches 450 to 500 degrees Celsius, the welding wire is added to the welding part to make the welding wire melt evenly into the weld. However, the flame cannot be directly aimed at the welding wire for heating, and the welding wire mainly dissolves by the temperature of the base metal. After completion, slightly sweep the welding part with a flame to ensure that the brazing metal of the welding part is spread and positioned, remove the welding gun and let it cool from the potato cherry blossom, and the welding can be completed.

Summary. Welding copper pipe fittings and auxiliary tin copper pipe fittings are not the same, one is to weld copper can be welded by flame brazing can also be welded by argon arc welding, in which the welding material of flame brazing can be divided into low temperature and high temperature. If it is argon arc welding, use the argon arc welding wire of the copper pipe to weld, such as 204 copper argon arc welding wire.

If it is tin attached copper pipe fittings welding, you need to consider the tin plating on the surface, you need to use low-temperature soldering welding, you can also use fusion welding argon arc welding, argon arc welding needs to be welded with brass argon arc welding wire such as the brass argon arc welding wire of Viodin 204s, can not be welded with copper argon arc welding wire.

Good morning. Both argon arc welding and gas welding can be used. Copper TIG welding does not require flux, and gas welding requires the addition of borax as flux.

Welding copper pipe fittings and auxiliary tin copper pipe fittings are not the same, one is to weld copper can be welded by flame brazing can also be welded by argon arc welding, in which the welding material of flame brazing can be divided into low temperature and high temperature. If it is argon arc welding, use the argon arc welding wire of the copper pipe to weld, such as 204 copper argon arc welding wire. If it is tin attached copper pipe fittings welding, you need to consider the tin plating on the surface, you need to use low-temperature soldering welding, you can also use fusion welding argon arc welding, argon arc welding needs to be welded with brass argon arc welding wire such as the brass argon arc welding wire of Viodin 204s, can not be welded with copper argon arc welding wire.

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Summary. How to weld copper pipes and steel plates.

The melting point of copper is very low relative to the melting point of steel, and the two can not be welded in theory, so it is best to use threaded connection, if the strength requirements are not large, bonding, or gas welding (that is, commonly known as water welding). Hope it helps.

How to weld copper pipes and steel plates.

How to weld copper pipe and steel plate The melting point of copper is very low relative to the melting point of steel, and the two can not be welded in theory, so it is best to use threaded connection, if the strength requirements are not large, bonding can be used, or gas welding (that is, commonly known as water welding). Hope it helps.

We hope we can help you.

Copper-aluminum welding is to connect copper materials and aluminum materials through welding processes. Because copper and aluminum are easily oxidized metals, the welding of copper and aluminum has always been an international welding problem.

Commonly used welding methods:

1. Traditionally, the method of hanging tin and molten tin is commonly used to weld copper and aluminum, this method is not well formed, there is no good strength, because the melting point of tin is low and can not be welded in the workpiece under high temperature work, so this process is only suitable for use on small workpieces under low temperature conditions (only suitable for the welding of multi-strand copper wire and small specification aluminum enameled wire), it is difficult to apply to the production of other products.

2. Welding copper and aluminum by welding methods such as fusion welding, friction welding, cold pressure welding, ** welding, electron beam welding, ultrasonic welding, etc., the welded joint is brittle, easy to produce cracks and pores in the weld, and the welded workpiece will inevitably break, and the conductor may be broken and the pipeline leaks after the fracture, so it often fails to achieve the required effect in actual production.

3. Copper and aluminum are welded together by brazing (usually flame brazing, furnace brazing and high-frequency brazing, etc.), and copper and aluminum are welded together through the brazing process as an intermediate medium (in fact, metallurgical reaction occurs, and the brazing metal penetrates into the molecular structure of copper and aluminum through capillary action), and the joint is well formed after welding, with good tensile and shear resistance and good conductivity and corrosion resistance, which is a commonly used copper and aluminum welding method at present, copper-aluminum solder paste, etc.

Introduction to copper-aluminum brazing methods:

Thoroughly remove the oil, dirt, and insulation layer on the base metal before welding; When welding, the base metal is heated first, the thick parts are heated first, and then the thin parts are heated; Heat the copper parts first, then the aluminum parts; When the temperature of the weldment reaches 450-500 °C, the welding wire is added to the welding part to make the welding wire melt evenly and flow into the weld (the flame cannot be directly aimed at the welding wire for heating, and the welding wire mainly dissolves by the temperature of the base metal). Then sweep the welding part slightly with the flame to ensure that the brazing metal of the welding part is spread and positioned, remove the welding gun and let it cool naturally, and the welding can be completed.

Introduction to the use of copper-aluminum solid-core welding wire with copper-aluminum solder paste:

It is suitable for the welding of large-area copper-aluminum bars, foils and large-diameter copper-aluminum pipes, and thoroughly removes the oil, dirt, and insulation layer of the base metal before welding, and can be evenly coated with copper-aluminum solder paste on the welding site with brushes, etc., and closes the copper-aluminum base metal to keep the weldment flat, and the appropriate fixture is applied to fix, and the thick parts are heated first and then the thin parts are heated with a flame; Heat the copper parts first, and then the aluminum parts to ensure that the weldments are evenly heated. When heating, you can see that the brazing paste first changes from the paste to a white solid, and continues to heat, when the solid becomes liquid, the brazing paste reaches the active temperature, and the brazing wire is added to the weld in time, when the weld is full of brazing metal, then slightly sweep the welding part with a flame, so that the remaining flux can be discharged from the weld to avoid slag inclusion. Remove the welding torch and allow the workpiece to cool down naturally, and the welding can be completed.

When welding, you must master the heat, use a special copper and aluminum electrode, first clean the surface of the pipe, clean it with fine sandpaper, heat do not rush to use the welding rod, it is different from the welding copper, if you put on the welding rod, the welding rod will not melt to the aluminum tube, and become a small ball to fall. The welding torch shakes back and forth, do not stay, if it stays, the aluminum tube will be welded through, and then put on the welding rod when the aluminum tube is slightly red, then the welding rod will be immediately accommodated on the tube, and the welding pipe must be practiced more.