Aluminum welding refers to the welding of aluminum and aluminum alloy, which makes many people love and hate it. They often need aluminum welding in their daily life, but it is difficult to weld, which has become a problem for many people.

Common problems of aluminum welding

The reason why aluminum welding is difficult is because of the following problems: aluminum has strong oxidation, fast thermal conduction, large line expansion coefficient is easy to deform, easy to form air holes in the welding process, and welding joints are softened. To successfully weld aluminum, not only a suitable welding equipment, but also certain measures to ensure the welding quality.

Aluminum welding techniques and skills

1, the stoma is almost all aluminum and aluminum alloy welding problems, its source is —— hydrogen. In order to avoid the generation of pores, it is recommended to dry the welding materials, such as welding wire and electrode, first before welding, in order to reduce the occurrence of hydrogen.

2, welding, first the aluminum surface and the surrounding wipe clean, can use a special stainless steel brush to remove the oxide layer.

3. Carbonized flame welding should be used to avoid the flame directly opposite the aluminum pipe. It is recommended to heat the aluminum pipe 1-2cm away from the aluminum pipe. When the copper pipe is dark red, then put the aluminum welding rod, and do not cause the aluminum pipe to melt.

4. The melting point of the welding rod is low, so it is necessary to evenly smear the flux on it, and then heat the electrode to ensure the quality of the solder joint.

5, the welding time also needs to be mastered, the welding time is too long is easy to lead to aluminum melting, thinning and other problems, in this case, the pressure is very easy to leak.

6. Due to the limited welding space, the water tank should be protected in the process of use, and wet towels can be placed.

7. After welding, stop for 1 minute, and then use wet cloth for auxiliary cooling, so as to avoid the combination of welding joint. Please note that the best effect of welding is successful one-time welding. If secondary processing is needed, the effect will be greatly reduced and deformation is easy to occur.

Welding aluminum alloy with a welding rod, mainly pay attention to the following points:

1: the choice of DC welding machine, AC welding machine arc is not stable, very easy to break the arc, can not operate.

2: The Angle between the electrode and the workpiece should be as large as possible, that is, as vertical as possible.

3: the strip speed should be fast, generally should be the ordinary carbon steel electrode welding speed twice. Because the melting point of aluminum is much lower than that of steel, so the aluminum welding rod will burn faster.

4: the storage of aluminum welding rod must pay attention to sealing, aluminum welding rod has a strong moisture absorption, sealing is not good, the water absorption is very serious.

5: For thick parts, preheating measures should be taken according to the actual situation.

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