外加磁场对非等厚铝合金电阻点焊熔核偏移的影响  

Effect of external magnetic field on nugget shift of aluminum alloy resistance spot weld with unequal thickness

作　　者：颜福裕[1,2] 李洋[1,2] 罗震[1,2] 谈辉[1,2] 罗彤 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]高新船舶与深海开发装备协同创新中心,上海200240 [3]大庆油田责任有限公司天然气分公司检测中心,大庆163000

出　　处：《焊接学报》2016年第2期67-70,132,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50975197;51275342)

摘　　要：针对两层板及三层板组合下的5052铝合金进行了外加磁场与常规情况下的电阻点焊,研究了外加磁场对铝合金点焊熔核偏移影响.结果表明,外加磁场改善了两层板及三层板非等厚度铝合金的熔核偏移情况,尤其是针对熔核偏移较严重的板材厚度组合下,外加磁场改善熔核偏移的作用更加明显.之后针对外加磁场和常规点焊情况的不同两层及三层板铝合金板厚组合式样进行了剪切拉伸测试.结果表明,外加磁场在改善点焊熔核偏移的同时,提高了点焊接头的强度.因此,外加磁场是一种改善非等厚度铝合金点焊熔核偏移及提高接头剪切拉伸性能的有效方法.Resistance spot welding( RSW) of two-layer and three-layer aluminum alloy sheets was conducted under external magnetic field( EMF),and the effect of external magnetic field( EMF) on the nugget shift was investigated. The results show that the EMF improved the nugget shift of aluminum alloy resistance spot weld with unequal thickness. The effect of EMF became more obvious in the case of thickness combination in which the nugget shift was more serious. Tensile shear test was performed to investigate the joint strength with and without EMF.The results show that the EMF could improve the joint strength and meanwhile alleviate the nugget shift. Accordingly,the external magnetic field is an effective method to improve the jointstrength and reduce the nugget shift of aluminum alloy resistance spot weld with unequal thickness.

关 键 词：电阻点焊 外加磁场 铝合金 熔核偏移 焊点质量 

分 类 号：TG453.9[金属学及工艺—焊接]