密封高压气体的激光焊接工艺研究

摘要

To achieve the seal of the high-pressure gas in the device,a set of laser welding processing equipment was designed and manufactured.The effect of laser processing parameters on the welding process was studied,and the in-fluences of some parameters such as pulse energy,defocusing amount,helium pressure on weld depth,weld appearance and tightness were analyzed.The results show that the 10 MPa helium sealed in the devices and leakage rate of less than 1.33 ×10 -9 Pa·m3 /s were achieved by optimizing the process parameters.In addition,with the increase of heli-um pressure,the weld depth increases gradually,weld appearance has been improved and the metal luster of weld sur-face has been enhanced.%为了实现在器件内密封高压气体，设计制造了一套激光焊接加工设备。主要研究其激光加工参数对焊接工艺的影响，分析单脉冲能量、离焦量、氦气压力等参数，对其焊接熔深、焊缝形貌及气密性的影响。试验结果表明，通过优化工艺试验参数，最终可实现在器件内密封10 MPa 氦气，泄漏率小于1．33×10－9 Pa·m3／s；并且随着氦气压力的增大，焊接熔深逐步增大，焊缝形貌改善，表面金属光泽度增强。