点焊热镀锌双相高强度钢的电极磨损规律  

Characteristics of electrode wear in spot welding of hot galvanized dual-phase high strength steel

作　　者：张旭强[1] 罗爱辉[1] 张延松[1] 陈关龙[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030

出　　处：《焊接学报》2006年第9期108-112,共5页Transactions of The China Welding Institution

摘　　要：热镀锌双相高强度钢是适应汽车轻量化与安全性需要而刚刚发展起来的一种新型板材,强度高,抗腐蚀性能好,但点焊时电极磨损严重,不确定性大,对焊点质量造成很大影响。首先确定了点焊强度为600 MPa的热镀锌双相钢的焊接性范围,然后根据焊接性范围确定焊接工艺参数进行电极磨损试验。研究了电极磨损时的电极表面形貌、轴向磨损、端面直径磨损的变化规律,分析了不同电极磨损阶段的轴向磨损对端面直径磨损的贡献率。结果表明初始焊接阶段电极磨损速率较大,点蚀加剧了电极磨损与失效。Hot galvanized dual-phase high strength steel is a new steel to be used in auto body to meet automobile light-weight and safety requirements.It has high strength and good corrosion resistance,but spot welding of this dual-phase steel has serious and uncertain electrode wear,which has great effect on weld quality.Firstly weld lobe of welding dual-phase steels with 600 MPa strength(DP600) was established by experiment,and then welding parameters according to the weld lobe were determined to carry out electrode wear experiment.Characteristics of electrode face morphology,radial and axial electrode wear were studied during the electrode wear test.Contribution ratios of electrode axis wear on radial wear at different wear stages were analyzed.The results showed that electrode wear rate was higher at beginning welds than later welds;pitting building at electrode surface accelerated electrode wear and invalidation.

关 键 词：电极磨损 双相钢 电阻点焊 

分 类 号：TG455[金属学及工艺—焊接]