Ship parts need argon arc welding. The commonly used welding methods of aluminum alloy ship welding are manual argon arc welding, that is, TIG welding and MIG welding with automatic wire feeding. The arc penetration ability of TIG welding is weak, which makes the single weld penetration deeper. It can be used for welding plates below 3 mm, and can also be used for multi-layer and multi-pass welding of aluminum alloy plates above 3 mm.