Aluminum alloys are widely used in various welded structural products due to their light weight, high specific strength, good corrosion resistance, non-magnetic properties, good formability, and good low temperature performance. Aluminum alloy is used to replace steel plate material for welding, and the structural weight can be reduced by more than 50%. At present, it is widely used in aviation, aerospace, automobile, power battery, machinery manufacturing, shipbuilding, chemical industry and daily necessities. However, the welding of aluminum is inseparable from the welding process of the laser welding head.