When welding aluminum alloy

If there are debris in the weld, it may be because the gas protection is insufficient. The gas flow should be increased, the arc should be covered, the gas nozzle should be moved close to the aluminum alloy the damaged gas nozzle should be replaced, the welding gun angle should be reduced, and the welding gun and gas duct should be checked for gas and water leaks.

There is dirt on the electrode. The preventive measure is to cover the motor when the wire spool is on the welding machine.

If there is dirt on the aluminum alloy, the surface oil and grease should be removed by chemical method, and the surface debris should be removed with a stainless steel wire brush.

If there is a thick oxide film or water stains on the aluminum alloy, a disc grinder should be used to remove the oxide film or rust.

When aluminum alloy is welded, there are pores, which may be caused by oil stains on the oxide film, welding wire, aluminum alloy, and gasket. The welding wire should be sealed and stored in a low-humidity constant temperature environment. The aluminum alloy and welding wire should be cleaned before welding.

Moisture or contamination in the protective gas, or too slow a flow rate of the protective gas, can also cause pores during aluminum alloy welding.

At this time, the leakage point of the inert gas protection bottle should not be lower than minus 20°C, increase the flow rate of the protective gas inert gas, and isolate the air flow.

If the cooling speed of the molten pool is too fast, it will also cause pores when welding aluminum alloy. At this time, a higher welding current or a lower welding speed should be used. If the aluminum alloy is preheated before welding, the occurrence of pores will be reduced.