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.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2006年第9期108-112,共5页
Transactions of The China Welding Institution
关键词
电极磨损
双相钢
电阻点焊
electrode wear
dual phase steel
resistance spot welding
