热镀锌高强钢点焊的点蚀对电极寿命的影响

Effect of pitting on electrode life in spot welding hot galvanization steel with high strength

建立了点焊过程多物理场耦合的点蚀有限元模型,分析了点蚀对电极端面温度与应力分布的影响规律,并进行相应的试验研究.结果表明,点蚀区域产生更高的温度与应力集中,降低电极使用寿命;点蚀区域在高温高压下容易产生微裂纹,镀层金属元素沿微裂纹渗入电极内部,加速电极失效,点蚀的产生与发展加剧电极寿命下降.

Finite element model of pitting during spot welding process was established to study the effect of pitting on temperature and stress distribution on electrode face,and corresponding experiments were carried out.The results show that higher temperature and pressure are produced at pitting area,which reduce electrode life.Micro-crack is also easily produced in pitting area at the higher temperature and pressure;through the crack,metal elements in galvanized coat are filtered into electrode,which accelerate electrode invalidation.