Research on welding process of aluminum alloy Metro A-type vehicle side wall

A型铝合金地铁车辆侧墙组焊工艺研究 Research on welding process of aluminum alloy Metro A-type vehicle side wall 欧阳超 OUYANG Chao 1 first-author 李贤清 LI Xianqing 1 湖南天一智能科技有限公司 湖南天一智能科技有限公司 Hunan Tianyi Intelligent Technology Co.,LTD. Hunan Tianyi Intelligent Technology Co.,LTD. 侧墙单元是地铁车体的骨架,需要与顶盖和底架分别进行焊接,起支撑整个车体的作用。侧墙单元的焊接主要采用MIG焊,因铝合金自身的焊接特性,焊接过程中容易产生焊接变形;其次,侧墙的焊接工序繁多,需要分别进行上门角组焊、下门角组焊、侧墙单元组焊等一系列工序,且每道工序都需严格控制方能保证整体的尺寸精度。通过分析侧墙单元的焊接难点,优化工艺参数,采用合适的组对工装和合理的焊接顺序,有效保证了侧墙单元的工艺尺寸和焊接质量,为后续类似侧墙单元的组焊提供了借鉴。 The side wall unit is the skeleton of the vehicle body, which needs to be welded with the top cover and underframe respectively to support the whole vehicle body. The welding method of side wall unit is MIG welding, which is easy to produce welding deformation in the welding process;secondly, the welding process requirements of the side wall are relatively high and there are many welding processes. A series of processes such as upper door corner assembly welding, lower door corner assembly welding and side wall unit assembly welding need to be carried out respectively. Each process needs to be strictly controlled in order to ensure the overall dimen-sional accuracy. Through the analysis of the welding difficulties of the side wall unit, through the optimization of process parameters, the use of appropriate assembly tooling and reasonable welding sequence, the welding deformation of the side wall unit in the assembly welding process is effectively controlled, so that the process size and welding quality of the side wall unit are well guaranteed, which provides a reference for the subsequent assembly welding of similar side wall units. 铝合金车体 侧墙单元 焊接变形 组焊 焊接顺序 U270.6 2022-03-08 10 51