李占明,朱有利,黄元林,韩志鑫

• 1:装甲兵工程学院装备再制造工程系

摘要(Abstract)：

用手工氩弧焊,ER5356焊丝对2A12铝合金板进行了焊接,采用超声冲击处理技术对焊接接头进行了全覆盖超声冲击处理;通过金相显微镜、扫描电镜和单向拉伸试验对处理和未处理的接头组织和力学性能进行了测试和观察分析,研究了超声冲击处理提高铝合金焊接接头强度和韧性的机理。结果表明:与未处理试样相比,超声冲击处理试样的抗拉强度提高了17.4%,伸长率增加了28%;未经超声冲击处理的2A12铝合金焊接接头断裂均发生在焊趾和熔合区,处理后断口均在焊缝中部断面,并在强化层处发生45°转折。超声冲击处理形成的塑性变形层和晶粒细化,以及降低接头表层气孔、缩松等焊接缺陷的作用是其改善焊接接头力学性能的主要原因。

关键词(KeyWords)： 铝合金;超声冲击;焊接接头;拉伸强度;伸长率

Abstract:

Keywords:

基金项目(Foundation): 北京市自然科学基金资助项目(No.3093027)

作者(Author): 李占明,朱有利,黄元林,韩志鑫

DOI: 10.13289/j.issn.1009-6264.2010.07.013

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