Study on arc properties of laser K-TIG hybrid welding of 304 stainless steel

304不锈钢激光K-TIG复合焊接电弧特性的研究 Study on arc properties of laser K-TIG hybrid welding of 304 stainless steel 李京洋 LI Jingyang 1 first-author 李伟 LI Wei 2 焦向东 JIAO Xiangdong 1 朱加雷 ZHU Jialei 1 梁栩 LIANG Xu 1 肖镌璐 XIAO Juanlu 2 北京石油化工学院机械工程学院 北京石油化工学院机械工程学院 School of Mechanical Engineering,Beijing Institute of Petrochemical Technology School of Mechanical Engineering,Beijing Institute of Petrochemical Technology 北京化工大学机电工程学院 北京化工大学机电工程学院 College of Electrical and Mechanical Engineering,Beijing University of Chemical Technology College of Electrical and Mechanical Engineering,Beijing University of Chemical Technology 针对4 mm厚度304不锈钢板开展激光K-TIG复合焊接实验,利用高速摄像和图像处理技术采集电弧形态,分析和探索各工艺参数对电弧形态的影响规律。实验结果表明:电弧形态稳定与否的关键是能量配比,当激光焦点距离阳极较近时,由于电弧与试件有效接触面积变大,导致电弧吸收激光能量增加,电弧趋于稳定;当激光焦点作用于阴极附近时,电弧变得发散,稳定性下降。实验得到的最佳热源间距为0～3 mm,最佳离焦量为0 mm。 The laser K-TIG hybrid welding experiment is carried out on the 304 stainless steel plate with thickness of 4 mm. The high-speed camera and image processing technology are used to collect and analyze the arc shape in the process of laser K-TIG hybrid welding,and explore the influence law of various welding parameters on the arc shape. The results show that proper energy ratio is the key to arc stability. When the laser focus is near the anode,the arc section enlarges,so that the laser energy absorbed by arc increases and arc is stable. When the laser focus is close to the cathode,the arc fluctuates violently and the arc stability reduces. Therefore the optimal heat source spacing range is 0～3 mm,and the optimal defocus distance is 0 mm. K-TIG 激光复合焊接 电弧形态 图像处理 K-TIG laser hybrid welding arc shape image processing TG457.11 国家自然科学基金项目(51675052) 2022-03-08 4 50