激光-LDD焊接在气体发生器中的应用研究

Application Research of Laser-LDD Welding in Gas Generator

为了验证激光焊接满足发生器壳体连接要求,开发了光纤激光焊接试验系统,采用2 500 W激光器和LDD激光焊接全过程监测系统优化了安全气囊气体发生器壳体焊接工艺。进行了高强度低合金碳钢发生器壳体水爆压力试验和视觉检测试验研究,结果表明:当激光功率为1 400~1 500 W时,DAB5系列气体发生器壳体的水爆压力值达到66 MPa,壳体有开裂现象,焊接强度大于60 MPa,熔深在2~3 mm内,焊缝偏心距为0~0.2 mm,有效熔宽为0.5~0.8 mm,均满足指标要求。

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.