针对低碳镀锌钢板与6061铝合金CMT熔钎焊接头熔合面积对其抗剪强度和破坏模式的影响进行研究.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,进而导致接头的抗剪强度逐渐减小,接头的断裂位置由铝熔合区破坏向钢/铝界面层破坏转变.根据实验结果,考虑界面层的失效判据,建立CMT接头拉剪过程的数值模型,讨论熔合面积影响接头抗剪强度及破坏模式的原因.
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