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Si,Mg对铝/钢熔钎焊焊接接头力学性能的影响

黄健康, 李杰, 沈利民, 石玗, 顾玉芬, 樊丁

黄健康, 李杰, 沈利民, 石玗, 顾玉芬, 樊丁. Si,Mg对铝/钢熔钎焊焊接接头力学性能的影响[J]. 焊接学报, 2016, 37(8): 96-100.
引用本文: 黄健康, 李杰, 沈利民, 石玗, 顾玉芬, 樊丁. Si,Mg对铝/钢熔钎焊焊接接头力学性能的影响[J]. 焊接学报, 2016, 37(8): 96-100.
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HUANG Jiankang, LI Jie, SHEN Limin, SHI Yu, GU Yufen, FAN Ding. Effects of Si and Mg on mechanical properties of aluminum-steel welded-brazed joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(8): 96-100.
Citation: HUANG Jiankang, LI Jie, SHEN Limin, SHI Yu, GU Yufen, FAN Ding. Effects of Si and Mg on mechanical properties of aluminum-steel welded-brazed joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(8): 96-100.
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Si,Mg对铝/钢熔钎焊焊接接头力学性能的影响

  • 1.

    兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050

  • 2.

    长城汽车股份有限公司, 保定 071000

基金项目: 973计划前期研究专项（2014CB660810）；兰州理工大学红柳青年人才培养计划项目（Q201202）

Effects of Si and Mg on mechanical properties of aluminum-steel welded-brazed joint

  • 1.

    State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

  • 2.

    Great Wall Motor Company Limited, Baoding 071000, China

摘要

    摘要
  • 摘要: 采用脉冲旁路耦合电弧MIG熔钎焊方法，分别采用4043，5356铝合金焊丝对5052铝合金/镀锌钢异种金属进行了搭接焊.通过扫描电镜（SEM），能谱仪（EDS），X射线衍射仪（XRD）对铝/钢连接界面、接头断裂行为及断口形貌进行了分析，发现5356铝合金焊丝焊接接头的润湿角要大于4043铝合金焊丝焊接接头的润湿角，合金元素Si既可改变界面反应层金属间化合物的形态同时还可显著减少Fe2Al5层的厚度.拉伸试验发现5356铝合金焊丝焊接所得接头主要断裂于界面反应层，属于脆性断裂；4043铝合金焊丝焊接所得接头主要断裂于熔合区，是以韧性断裂为主的混合断裂.通过对4043铝合金焊丝焊接所得接头进行显微硬度测试，发现热影响区组织的显微硬度明显低于其它区域的显微硬度，这导致4043铝合金焊丝焊接接头主要断裂于熔合区.
    Abstract: Dissimilar metals of 5052 aluminum alloy and galvanized steel were joined with lap joint by pulsed double electrode gas metal arc welding-brazing with ER4043 filler metal and ER5356 filler metal, respectively. The interfacial microstructures, fracture behavior and fracture morphologies of the joints were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-Ray diffraction. The results show that wetting angle of weld with Al-Mg filler metal is larger than that with Al-Si filler metal. Si atoms change the shape of intermetallic compounds and inhibit the formation of Fe2Al5 intermetallic compound. The results of tensile tests show that the welded joints with Al-Mg filler metal mainly fracture along the interface between the intermetallic layer and the steel, and the fracture mode of the joints is brittle fracture. The welded joints with Al-Si filler metal mainly fracture in the fusion zone of aluminum alloy, and the fracture mode of the joints mainly is ductile fracture, but has the trace of brittle fracture. Hardness of joints with Al-Si filler metal was determined, the results show that the hardness of aluminum heat affect zone is obviously lower than that of the other zone, which leads to the joints with Al-Si filler metal failure in aluminum fusion zone.
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    • 参考文献(10)
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  • 收稿日期:  2014-09-25

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