汽车用厢体钢焊缝开裂原因分析  

Cause Analysis of Weld Crack of Automobile Body Steel

作　　者：杨正宗 许伟 周建川 苗招亮 YANG Zheng-zong;XU Wei;ZHOU Jian-chuan;MIAO Zhao-liang(HBIS Central China Sales Company,Zhengzhou,Henan,450009,P.R.China;HBIS Handan Iron and Steel Technology Center,Handan,Hebei,056003,P.R.China)

机构地区：[1]河钢集团华中销售公司,河南郑州450009 [2]河钢集团邯钢公司,河北邯郸056015

出　　处：《南方金属》2024年第6期19-22,共4页Southern Metals

摘　　要：汽车用厢体钢焊缝开裂是加工过程中常见问题。通过对用户焊缝开裂试样的组织和力学进行分析,找出开裂原因,并提出改进措施。结果表明:厢体钢母材的金相组织及力学性能并非焊缝开裂的主要原因,而焊接工艺不当导致焊缝区域魏氏组织的产生,是焊缝开裂的主要原因。通过降低焊接电流,增加顶锻距离保证焊缝的韧性和延伸性能,避免了焊缝开裂。Car body steel is one of the common problems in machining process.The microstructure and mechanics of the weld crack specimen is analyzed.The crack reason has been found,and the corresponding improvement measures are put forward.The results show that the metallographic structure and mechanical properties of the base metal are not the main reasons for the weld crack.The Widmanstatten microstructure in the weld area caused by improper welding process is the main reason for weld crack.By reducing the welding current and increasing the upsetting distance,the toughness and elongation of the weld are ensured,thus avoiding the cracking of the weld.

关 键 词：焊缝开裂 魏氏组织 厢体钢 

分 类 号：U463.84[机械工程—车辆工程]