摘要
采用不同搭接形式,对铝合金6061-T6/黄铜H70异种材料热补偿电阻点焊工艺进行研究.对比了两种搭接形式下铝/黄铜异种点焊接头的微观组织与力学性能差异.结果表明,采用热补偿电阻点焊的工艺方法可在较低电流水平下实现铝/黄铜异种材料的焊接.在铝侧施加热补偿垫片进行点焊,接头的抗拉剪载荷更高,其熔核由细小的α-Al等轴晶组成;在黄铜侧施加热补偿垫片进行点焊,接头的抗拉剪载荷较小,但体现出延性断裂的特征,其熔核由板条状铜铝化合物组成.
The process of thermo-compensated resistance spot welding for aluminum alloy 6061-T6 and alpha brass H70 was studied by using different lap joint design.The difference of microstructures and mechanical properties of Al/Brass dissimilar joints welded by two kinds of joint design was compared.The results showed that aluminum alloy and brass can be welded at lower current by using thermo-compensated resistance spot welding.When the thermal compensation coupon was set at Al side,the tensile shear load of the joint was higher in which the nugget consisted of fine equiaxed α-Al grains.When the thermal compensation coupon was set at brass side,the tensile shear load of the joint was lower,but ductile fracture characteristic was showed and the nugget consisted of lath-shaped Cu-Al intermetallic compound.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2017年第3期37-40,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51505327
51405334
51275342
51575383)
教育部博士点基金资助项目(20130032110004)
关键词
铝/黄铜异种焊接
热补偿电阻点焊
微观组织
力学性能
dissimilar welding of aluminum and brass
thermo-compensated resistance spot welding
microstructure
mechanical properties
