Study on the position adaptability of 7N01 aluminum alloy plate butt joint by MIG welding

7N01铝合金板材对接MIG焊接位置适应性研究 Study on the position adaptability of 7N01 aluminum alloy plate butt joint by MIG welding 范军 FAN Jun 1 first-author 韩光旭 HANG Guangxu 1 戴晓超 DAI Xiaochao 1 王泽飞 WANG Zefei 1 中车长春轨道客车股份有限公司 中车长春轨道客车股份有限公司 CRRC Changchun Railway Vehicles Co.,Ltd. CRRC Changchun Railway Vehicles Co.,Ltd. 7N01铝合金是高速列车车体关键材料,生产中往往需要在各种不同焊接位置条件下进行焊接,接头对不同位置的适应性是决定实际生产工艺设计的关键。采用熔化极惰性气体保护焊(MIG)方法,利用高速列车现行焊接工艺,制备了高速列车结构材料7N01的平焊接头、仰焊接头及立向上焊接头,观察接头宏观形貌,研究不同位置条件下焊接接头的组织与性能,分析不同焊接位置对接头性能的影响。结果表明:不同焊接位置的焊接工艺均能保证得到优质的焊接接头,在PA位置条件下接头抗拉强度最高。 7N01 aluminum alloy is the key material of high-speed train body,which is often welded in different welding positions. In different welding positions,the adaptability of the joint to different positions is the key to determine the actual production process design. In this study,using the method of MIG and the current welding technology of high-speed train,the flat welding joint,overhead welding joint and vertical up welding joint of high-speed train structural material 7N01 were prepared,the macroscopic appearance of the joint was observed,the structure and performance of the welded joint under different positions were studied,and the influence of different welding positions on the joint performance was analyzed. The results show that the welding process at different welding positions can ensure the quality of the welded joint,and the tensile strength of the joint is the highest at PA position. 7N01铝合金 高速列车 焊接位置 组织性能 7N01 aluminum alloy high-speed train welding position microstructure and properties TG444.74 国家重点研发计划资助(2016YFB1200501) 2022-03-08 1 50