基于脉冲激光GMAW熔滴尺寸与过渡频率的控制

Control on droplet size and metal transfer frequency based on pulsed laser in GMAW

针对水下焊接修复中存在的射滴过渡可选参数范围狭窄、热输入高、焊接残余应力等问题,文中基于水下高压焊接试验舱,建立了包含多信号同步采集的激光增强GMAW试验平台,并在常压环境下进行了工艺试验.结果表明,合理选择激光作用位置和激光脉冲占空比,通过激光辅助作用,熔滴过渡摆脱了对焊接电流的主导性依赖,实现激光对GMAW熔滴过渡的主动控制.试验结果及相关理论分析为进一步的高压干法水下焊接过程稳定性控制研究及海洋工程应用奠定了基础.

To solve a series of problems existing in the projected droplet transfer of underwater welding such as narrow optional parameter,high input and residual stress,a laser-enhanced GMAW experiment platform including welding multi-information synchronization system was established and related experiment in atmospheric environment was conducted based on the underwater hyperbaric welding test tank in this paper. Result shows that droplet transfer gets rid of dominance of welding current and laser controls GMAW metal transfer actively with the assistance of laser when reasonable irradiation position and duty cycle of pulsed laser is selected. Result of experiment and related analysis laid a solid foundation on the further research of welding process stability control in underwater hyperbaric welding and ocean engineering.