钢/铝CMT接头熔合面积对接头强度及破坏模式的影响
Effect of Bonded Area on Shear Strength and Failure Mode in Steel/Al CMT Brazed Joint
冷金属过渡焊（CMT）是一种能够有效控制焊接热输入的电弧焊接方法，可以在不引起薄板大变形的前提下实现钢/铝异种材料的熔钎焊连接，有望在汽车轻量化制造中获得应用。本文针对影响镀锌钢板与6061铝合金CMT熔钎焊接头熔合面积的工艺因素展开研究，进而探讨了熔合面积对接头拉剪强度和破坏模式的影响。研究结果表明，熔钎焊过程中，随着焊枪相对于搭接接头中心线偏移量的增大，接头的熔合面积逐渐减小，润湿角增大，进而导致接头的拉剪强度逐渐减小，接头的破坏模式由铝合金热影响区断裂模式向界面层破坏模式转变。根据CMT接头的截面形状和拉剪实验的结果，考虑界面层的失效判据，建立了CMT接头拉剪过程的有限元模型，对熔合面积影响接头拉剪强度及破坏模式的原因进行了讨论。
old metal transfer CMT) is a kind of arc welding method with low energy input. Since the welding energy input can be effectively controlled, this method can be used to joint aluminum to steel thin sheet without large distortion. And it is expected to be used in the automotive lightweight manufacture. Effect of bonded area on shear strength and failure mode of galvanized low carbon steel /6061 Al alloy CMT brazed joint was studied in this paper. It was shown that with welding torch offset increasing, the bonded area of CMT joint decreased and the wetting angle increased. That led to the decreasing of lap-shear strength and transferring of joint failure mode. Based on the experimental results, a numerical model of lap-shear process of CMT joint considering the failure criterion of interface layer, was established. The reason of bonded area influencing shear strength and failure mode of CMT joint was discussed in the simulating results.
杨硕、杨上陆、雷永平、孔德凝、林健
焊接、金属切割、金属粘接金属学、热处理
材料合成与加工工艺熔合面积拉剪强度钢/铝接头焊枪偏移量冷金属过渡焊
Materials synthetizing and processing technologyBonded areaShear strengthSteel/Al jointTorch offsetCold metal transfer
杨硕,杨上陆,雷永平,孔德凝,林健.钢/铝CMT接头熔合面积对接头强度及破坏模式的影响[EB/OL].(2013-03-14)[2025-08-19].http://www.paper.edu.cn/releasepaper/content/201303-559.点此复制
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