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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Cu-Interlayer Thickness on Microstructures and Mechanical Properties of MIG-Welded Mg-Steel Joints
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Influence of Cu-Interlayer Thickness on Microstructures and Mechanical Properties of MIG-Welded Mg-Steel Joints

机译：铜中间层厚度对MIG焊接Mg-钢接头组织和力学性能的影响

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摘要

The joining of AZ31B Mg alloy to Q235 steel was realized by metal inert-gas arc welding using Cu-interlayer. Microstructure characteristics and mechanical properties of Mg-steel joints with Cu-interlayer of different thicknesses were investigated. The results indicated that acceptable joints with sound appearance could be obtained by adjusting the thickness to the range of 0.1-0.2 mm. In particular, at the thickness of 0.15 mm, the average tensile strength reached a maximum of 190 MPa, representing a 79% joint efficiency relative to the Mg base metal. Further increasing the thickness would cause more formation of coarse and thick Mg-Cu eutectic structure and Mg-Al-Cu ternary phase, which resulted in the decrease of joint strength. Therefore, the best thickness of Cu-interlayer to obtain high strength of Mg-steel MIG-welded joint was in the range of 0.1-0.15 mm. The average microhardness reached the maximum value in the reaction layer because of the presence of FeAl intermetallic compounds.
机译：AZ31B镁合金与Q235钢的连接是通过使用Cu-interlayer的金属惰性气体弧焊实现的。研究了具有不同厚度的铜中间层的镁钢接头的组织性能和力学性能。结果表明，通过将厚度调整到0.1-0.2 mm的范围，可以获得具有良好外观的合格接头。特别地，在0.15mm的厚度下，平均抗拉强度达到最大值190MPa，这表示相对于Mg母材的79％的结合效率。进一步增加厚度将导致更多的粗大和粗大的Mg-Cu共晶结构和Mg-Al-Cu三元相形成，从而导致接头强度降低。因此，获得高强度的Mg钢MIG焊接接头的Cu中间层厚度在0.1-0.15mm的范围内。由于存在FeAl金属间化合物，平均显微硬度在反应层中达到最大值。

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