三层板6061铝合金点焊接头形式对其力学性能的影响

Effect of joint type on mechanical properties of three-sheet 6061 aluminum alloy resistance spot welds

文中研究了三层板6061铝合金电阻点焊接头的失效行为.设计了6种形式的三层板铝合金点焊搭接接头,并对其进行了剪切拉伸试验.通过剪切拉伸测试中获得的峰值载荷和吸收能研究不同接头形式下的力学性能.结果表明,不同搭接形式的接头具有不同的接头峰值载荷和吸收能.在剪切拉伸测试中,熔核的旋转程度对接头的峰值载荷和吸收能具有重要影响.熔核旋转程度越大,峰值载荷越小,吸收能越低;而对于纯剪切情况,峰值载荷和吸收能最高.

In this paper,the failure behavior of threesheet 6061 aluminum alloy resistance spot is studied to evaluate the mechanical properties of the welded joint,the tensile-shear tests were performed in six different joint types.Mechanical performance of the joint was described in terms of peak load and energy absorption.The results showed that different joints exhibit different peak load and energy absorption.The rotation of nugget plays an important role in controlling the peak load and energy absorption during the tensile-shear test.Large rotation of nugget will lead to the low peak load and energy absorption.The maximum peak load and energy absorption is obtained when the sheet/sheet interface is subjected to pure shear.