What welding machine is used for aluminum alloy welding?

Both AC flame welding and AC argon arc welding can be used for aluminum alloy welding, which can effectively break the aluminum oxide film produced during welding and ensure the welding quality.

The main welding processes are manual MIG welding (metal inert gas) and automatic MIG welding, as well as parent metal, welding wire, shielding gas and welding equipment.

This welding method can be used to weld aluminum alloy sheets with thickness below 5 mm, but the welding equipment is complicated, the welding current is large and the productivity is high, which is especially suitable for mass production of parts.

Pulsed argon arc welding can improve the stability of welding process and adjust parameters to control arc power and weld formation. The weldment has small deformation and heat affected zone, which is especially suitable for thin plate, all-position welding and welding of forged aluminum, hard aluminum and superhard aluminum with strong thermal sensitivity.

Extended data:

It is best to choose a point contact tool for aluminum alloy welding to reduce the contact area between the tool and the workpiece. If the fixture is in surface contact with the workpiece, it will quickly take away the heat of the workpiece and accelerate the solidification of the molten pool, which is not conducive to the elimination of weld porosity. The pressure of the hydraulic system of the tooling is preferably controlled at 9 ~ 9.5 MPa.

Too little pressure can not achieve the preset anti-deformation purpose, but too much pressure will increase the constraint of aluminum alloy structure. Due to the large linear expansion coefficient and poor high-temperature plasticity of aluminum alloy, it is easy to produce large thermal stress during welding, which may cause cracks in aluminum alloy structure.

Baidu encyclopedia-aluminium alloy welding