2024-T3薄板搅拌摩擦焊搭接界面成型及接头性能

Effect of interface morphology on mechanical property of FSW lap joints on 2024-T3 Al-alloy thin plank

采用搅拌摩擦焊,以三爪型搅拌头通过单、双道焊工艺,在相同的焊接参数下对包含或去除包铝层的2024-T3薄板铝合金进行搭接焊接.以包铝层为示踪材料,应用光学显微镜观察搭接接头宏观金相,研究了金属材料流动情况,观察原断裂位置,在上板前进侧发现了界面畸变.通过拉伸-剪切力测试,比较了接头性能.实验结果表明:采用双道焊(前进侧相对)工艺,可增大搭接界面宽度,减小或去除上板前进侧界面畸变的影响,提高搭接接头性能.

In this paper, it was discussed of that the interface joint with three-claw tool and plank conservation or remove single-double-welding craft in the morphology and mechanical property of FSW lap same welding parameter on 2024-T3 Al-alloy thin alclad. The metal flow was investigated using alclad for tracing material. The interface hook is discovered in advancing side （AS） of welding when metallographic of top-advance side of welding were observed using optical microscope. The tensile-sheer strength was detected. The result indicate that the mechanical property of friction stir welding（FSW） lap joint can be improved by both enlarge the width of lap interface and reduce, even erase, the interface hook effect using double-welding craft （AS opposite）.