Study on laser welding process characteristics of typical joints of stainless steel carbody in railway vehicle

轨道车辆不锈钢车体典型接头激光焊接工艺特性研究 Study on laser welding process characteristics of typical joints of stainless steel carbody in railway vehicle 韩晓辉 HAN Xiaohui 1 first-author 张志毅 ZHANG Zhiyi 1 马国龙 MA Guolong 1 郑自芹 ZHENG Ziqin 2 李刚卿 LI Gangqing 1 雷振 LEI Zhen 3 中车青岛四方机车车辆股份有限公司 中车青岛四方机车车辆股份有限公司 CRRC Qingdao Sifang Co.,Ltd. CRRC Qingdao Sifang Co.,Ltd. 中国兵器工业第五二研究所烟台分所有限责任公司 中国兵器工业第五二研究所烟台分所有限责任公司 Yantai Branch of China North Industries Group Corporation No.52 Institute Co.,Ltd. Yantai Branch of China North Industries Group Corporation No.52 Institute Co.,Ltd. 哈尔滨焊接研究院有限公司黑龙江哈 哈尔滨焊接研究院有限公司黑龙江哈 Harbin Welding Institute Co.,Ltd. Harbin Welding Institute Co.,Ltd. 通过优化两种板厚组合(2 mm+1.5 mm和1.5 mm+2 mm)的不锈钢非熔透型激光搭接焊的焊接工艺参数,实现对多参量耦合工况条件下的激光焊接质量控制,并对其疲劳性能进行研究。运用正交试验方法设计了焊接工艺试验,根据正交试验结果分析两种板厚组合焊接接头的3种关键焊接参数(焊接功率P、焊速v、离焦量f)与抗剪强度之间的关系,得出最优焊接工艺参数,即1.5 mm+2 mm板厚组合:P=3 700 W,v=4 330 mm/min,f=+4 mm;2 mm+1.5 mm板厚组合:P=3 700 W,v=4 580 mm/min,f=0 mm,对比分析最佳焊接工艺参数下两种板厚组合激光焊焊接接头的疲劳性能,2 mm+1.5 mm板厚组合焊接接头疲劳强度高于1.5 mm+2 mm板厚组合,为不锈钢车体激光焊接参数的进一步优化及疲劳性能研究提供了参考。 By optimizing the welding parameters of nonpenetration laser lap welding of stainless steel with two plate thickness combinations（2 mm +1.5 mm, 1.5 mm +2 mm）, the laser welding quality control under the condition of multi-parameter coupling was realized, and their fatigue performances were studied. The welding process test is designed by orthogonal test method. According to the orthogonal test results, the relationship between three key welding parameters（power,welding speed, defocusing amount） and shear strength of welded joints of these two plate thicknesses combinations is ana lyzed. And the optimal welding parameters are obtained, namely1.5 mm+2 mm plate thickness combination（power of 3 700 W,welding speed of 4 330 mm/min, defocusing amount of +4 mm）and 2 mm+1.5 mm plate thickness combination（power of 3 700 W, welding speed of 4 580 mm/min, defocusing amount of0 mm）. The fatigue properties of laser welded joints of these two plate thickness combinations under the optimal welding parameters are comparatively analyzed. The fatigue strength of welded joint of 2 mm+1.5 mm composite is higher than that of1.5 mm +2 mm composite, which provides a reference for further parameters optimization r and fatigue properties study of laser welding of stainless steel carbody. 激光搭接焊 正交设计 方差分析 焊接参数优化 疲劳极限 laser lap welding orthogonal design variance analysis welding parameter optimization fatigue limit U270.6;TG456.7 2022-03-08 10 51