关键词: 激光封焊, 4047铝合金, 焊接气孔

Abstract: 4047 aluminum alloy is widely used in aerospace microwave components, and the formation mechanism of laser welded porosity in 4047 aluminum alloy with different organizational compositions is investigated. The results show that the low Si content in the alloy reduces the heat absorption rate of the material, leading to reduced mobility in the hot melt zone and the formation of porosity. By increasing the welding laser power and improving the heat input of the alloy, the generation of porosity can be reduced, and the airtightness qualification rate of the product can be improved. The increased welding stress caused by the orientation of alloy organization can also easily lead to the generation of weld porosity. The welding quality can be improved by performing stress relief annealing treatment before welding.

Key words: laser sealing welding, 4047 aluminum alloy, weld porosity