焊接参数对镀锌低碳钢板点焊接头抗剪切力的影响  

Influences of Welding Parameters on the Shearing Strength of Resistance Spot-welded Joints of Galvanized Low Carbon Steel Sheets

作　　者：王丙旭 张宇 施泽平 Gary C.Barber 冯祖德 WANG Bingxu;ZHANG Yu;SHI Zeping;Gary C.Barber;FENG Zude(Faculty of Mechanical Engineering andAutomation,Zhejiang Sci-Tech University,Hangzhou 310018,China;Automotive Tribology Center,Oakland University,Rochester 48309,USA;Huineng Professional Welding Equipment Supplier,Dongguan 523000,China)

机构地区：[1]浙江理工大学机械与自动控制学院,浙江杭州310018 [2]奥克兰大学汽车摩擦学中心,美国罗彻斯特48309 [3]慧能焊接设备有限公司,广东东莞523000

出　　处：《电焊机》2022年第4期89-94,共6页Electric Welding Machine

基　　金：“机械工程”省重点建设学科重大重点成果培育计划项目(11130231742010)。

摘　　要：通过正交试验法研究了焊接电流、焊接时间和电极压力对热浸镀锌低碳钢板点焊接头抗剪切力的影响规律,并分析最佳焊接工艺参数下点焊接头的微观组织、硬度分布和抗剪切力。结果表明,焊接电流对点焊接头抗剪切力影响最大,最佳焊接工艺参数为:焊接电流13 kA、焊接时间80 ms、电极压力4 kN,在该参数下点焊接头抗剪切力为8.637 kN,熔合区组织主要为板条状马氏体,硬度为320 HV,母材区组织主要为铁素体,硬度为102 HV,热影响区组织为板条状马氏体和铁素体,硬度介于熔合区和母材区之间。The influences of welding parameters including welding current, welding duration and electrode force on the shearing strength of resistance spot-welded joints of hot-dipped galvanized low carbon steel sheets were studied by using orthogonal tests, and the microstructure, hardness distribution and shearing strength of welded joints produced by optimal welding parameters were also investigated. The results showe that the welding current has the most significant influences on the shearing strength of welded joints. The optimal welding parameters are welding current of 13 kA, welding duration of 80 ms and electrode force of 4 kN. The microstructure of welding zone is mainly lath martensite with hardness of 320 HV,the microstructure of substrate is mainly ferrite with hardness of 102 HV, the microstructure of heat affected zone is martensite and ferrite with the medium hardness.

关 键 词：电阻点焊 镀锌低碳钢板 焊接参数 抗剪切力 

分 类 号：TG407[金属学及工艺—焊接]