In order to verify that laser welding meets the generator shell connection requirements, a fiber laser welding test system was developed, and the airbag gas generator shell welding process was optimized by using a 2 500 W laser and LDD laser welding whole process monitoring system. The water burst pressure test and visual inspection test of the high-strength low-alloy carbon steel generator shell have been carried out. The results show that when the laser power is 1 400~1 500 W, the water burst pressure value of the DAB5 series gas generator shell reaches 66 MPa. There is cracking phenomenon, the welding strength is greater than 60 MPa, the penetration depth is within 2~3 mm, the eccentricity of the weld is 0~0.2 mm, and the effective melting width is 0.5~0.8 mm, which all meet the index requirements.