Method for removing aluminum alloy laser welding air holes

The invention relates to a method for removing aluminum alloy laser welding air holes. The method solves the problem that air hole defects are easily generated in the laser welding and laser-TIG hybrid welding process of aluminum alloy. The method comprises the steps that in the bifocal laser-TIG hybrid welding process of the aluminum alloy, namely, in the aluminum alloy welding process, two beams of lasers (LB1 and LB2) and a TIG electric arc are adopted to jointly act on a welded area, a welding joint bears the combined action of the three heat sources at the same time, and the action modes of the two lasers can be divided into three kinds which comprise a serial distribution mode in the welding direction, a parallel distribution mode perpendicular to the direction of the welding joint and a crossing distribution mode between the serial distribution mode and the parallel distribution mode. According to the welding method, the air hole rate is zero, and air hole defects of the aluminum alloy laser welding are overcome. The method is applied to the field of aluminum alloy laser welding.