焊接电流对H1000/GMW2异种钢电阻点焊接头组织与力学性能的影响  

Effect of Welding Current on Microstructure and Mechanical Properties of Resistance Spot Welded Joint of H1000 and GMW2 Dissimilar Steels

作　　者：王杰 冯巧波 王春亮 聂宇 雷海洋 WANG Jie;FENG Qiaobo;WANG Chunliang;NIE Yu;LEI Haiyang(College of Energy and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Shanghai Key Laboratory of Power Material Protection and New Materials,Shanghai University of Electric Power,Shanghai 200090,China;Shanghai FusionSmart Industry Equipment Co.,Ltd,Shanghai 200131,China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090 [2]上海电力大学上海市电力材料防护与新材料重点实验室,上海200090 [3]上海治嵘工业装备有限公司,上海200131

出　　处：《热加工工艺》2025年第1期45-50,共6页Hot Working Technology

基　　金：国家自然科学基金面上项目(52175343)。

摘　　要：对厚度均为1.2 mm的H1000不锈钢和GMW2低碳钢进行电阻点焊试验研究,分析了焊接电流对接头组织、力学性能以及拉剪断裂模式的影响规律。结果表明:随着焊接电流增大,接头拉剪力先增大再逐渐减小,当焊接电流为8.5 kA时,接头拉剪力达到最大,约为6800 N。当电流达到9.0 kA及以上时,接头内部产生缩孔和裂纹等缺陷,严重影响接头质量。接头存在明显的熔核偏移现象,熔核大部分位于H1000钢侧,组织为奥氏体和少量的马氏体,熔核区硬度介于两种母材之间,约为300 HV。接头的断裂方式随着熔核直径增大而改变,当焊接电流在6.5 kA及以下时,接头拉剪断裂模式为界面断裂,而当电流在7.0 kA及以上时,接头发生纽扣断裂。The resistance spot welding of H1000 stainless steel and GMW2 low carbon steel with the thickness of 1.2 mm was carried out to analyze the influence of welding current on the microstructure,mechanical properties and tensile-shear fracture mode of the joint.The results show that with the increase of welding current,the tensile shear force of the joint increases firstly and then decreases gradually.When the welding current is 8.5 kA,the tensile shear force of the joint reaches the maximum value,about 6800 N.When the current reaches or exceeds 9.0 kA,defects such as shrinkage and cracks are formed inside the joint,which seriously affects the quality of the joint.The joint has significant nugget offset phenomenon.Most of the nugget zone is located at the side of H1000 steel,and the microstructure is mostly austenite and a small amount of martensite,and the hardness of the nugget zone is between the two base metals,about 300 HV.The fracture mode of the joint transforms with the increase of the nugget diameter.When the welding current is less than or equal to 6.5 kA,the tensile shear fracture mode of the joint is interfacial fracture,while the current is bigger than or equal to 7.0 kA,the fracture mode of the joint is button fracture.

关 键 词：电阻点焊 异种金属 H1000不锈钢 

分 类 号：TG453.9[金属学及工艺—焊接]