Aluminum alloy is widely used in industrial products because it has good physical properties. Almost various welding methods can be used to weld aluminum and aluminum alloys. However, aluminum and aluminum alloys have different adaptability to various welding methods. Various welding methods have their own applications.
Due to improper selection of welding methods and welding process parameters, aluminum alloy parts may be severely deformed after welding, or defects such as weld pores, slag inclusions, and lack of penetration may lead to cracks in the weld metal or loose material, seriously affecting product quality. and performance. The following editor will take you to analyze the methods and precautions for aluminum alloy welding.
Three welding methods for aluminum alloys
Tungsten arc welding
Tungsten argon arc welding is mainly used for aluminum alloys and is a better welding method. However, tungsten argon arc welding equipment is more complex and is not suitable for operation in open air conditions.
Resistance spot welding, seam welding
This welding method can be used to weld aluminum alloy sheets with a thickness of less than 5mm. However, the equipment used during welding is relatively complex, the welding current is large, and the productivity is high. It is especially suitable for parts and components produced in large quantities.
Pulse argon arc welding
Pulsed argon arc welding can greatly improve the stability during the welding process and can adjust parameters to control arc power and weld formation. The weldment has small deformation and small heat-affected zone. It is especially suitable for thin plates, all-position welding and other occasions, as well as the welding of forged aluminum, hard aluminum, super hard aluminum, etc. that are highly sensitive to heat.
Precautions for welding aluminum alloys
1 Before welding aluminum alloy, the surface of the aluminum alloy must be cleaned first. There should be no oil, dust, etc. You can use acetone to clean the surface of the aluminum alloy welding joint. For thick plate aluminum alloy, use a wire brush to clean it, and then add acetone to clean it.
2. When welding aluminum alloy, the surface of the aluminum alloy must be cleaned first. There should be no oil smoke, dust, etc. In addition, thick plate aluminum alloy should be cleaned with a wire brush, and then cleaned with acetone.
3. If the plates can be preheated after comparison, this can prevent insufficient preheating from causing incomplete welding. When closing the arc, use a small current to close the arc and fill the pits.
4. Welding must be standardized and welded according to the thickness of the plate.
5. The cable of the welding gun should not be too long. If it is too long, the wire feeding will be unstable.