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石玗, 何翠翠, 黄健康, 曹睿, 余淑荣. 几种铝钢异种金属熔钎焊工艺的对比与分析[J]. 焊接学报, 2014, 35(5): 1-4.
引用本文: 石玗, 何翠翠, 黄健康, 曹睿, 余淑荣. 几种铝钢异种金属熔钎焊工艺的对比与分析[J]. 焊接学报, 2014, 35(5): 1-4.
SHI Yu, HE Cuicui, HUANG Jiankang, CAO Rui, YU Shurong. Comparison and analysis on dissimilar metals welding of aluminum alloy to galvanized steel by different welding-brazing methods[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(5): 1-4.
Citation: SHI Yu, HE Cuicui, HUANG Jiankang, CAO Rui, YU Shurong. Comparison and analysis on dissimilar metals welding of aluminum alloy to galvanized steel by different welding-brazing methods[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(5): 1-4.

几种铝钢异种金属熔钎焊工艺的对比与分析

Comparison and analysis on dissimilar metals welding of aluminum alloy to galvanized steel by different welding-brazing methods

  • 摘要: 采用脉冲旁路耦合电弧MIG焊、CMT及激光焊方法实现铝/镀锌钢板搭接焊,对焊缝界面微观组织、形貌及元素成分进行了观察分析,并测试了其力学性能.结果表明,三种焊接方法均可以实现铝/镀锌钢板异种金属的优质连接,获得成形良好的焊缝,搭接接头的抗拉剪强度均可以达到铝合金母材的80%以上,拉伸试样断裂在焊缝铝合金母材热影响区.当母材热输入及工艺合适时,三种方法下搭接接头界面处均形成一主要成分为Fe2Al5和FeAl3,平均厚度约为8 μm的金属间化合物,而且控制金属间化合物的生成是获得铝/钢焊接优质接头的关键.

     

    Abstract: The welding-brazing lap joints of aluminum/galvanized steel were obtained by using the pulse bypass coupling arc MIG welding (Pulsed DE-GMAW),cold metal transfer (CMT) and laser welding,respectively. The analysis on the microstructure, shape and elements of welding joint shows that these three welding methods are feasible for welding aluminum to steel,due to the low welding heat input of these methods,good weld formation can be also obtained. In addition,the mechanical properties of weld bead are measured. The results show that the tensile-shear strength of lap joint can reached 80% of the tensile strength of aluminum alloy; the sample fracture in the heat affected zone of aluminum alloy. When the heat-input and welding parameters were appropriated,it can generate a thin layer of Al-Fe intermetallic compounds on the lap joint interface under these three methods,and the average thickness of the compound layer is about 8 μm,it is confirmed that the intermetallic compounds is composed of Fe2Al5 and FeAl3. The key of welding aluminum to steel is control the formation of intermetallic compound in the interface by reducing the heat input.

     

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