| Effect of welding current on strength and microstructure in resistance spot welding of AZ31 Mg alloy |
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| 作者姓名： | 王亚荣 张忠典 冯吉才 |
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| 作者单位： | [1]Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics [2]State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001 |
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| 摘 要： | In this paper, resistance spot welding were performed on lmm-thickness magnesium AZ31B plates. The effect of welding current on the microstructure and tensile shear force was investigated. It was found that the welding current governed the nugget growth, and the nugget could not form if current levels were insufficient. The nugget revealed a homogeneous, equiaxed, fine-grained structure, which consisted of non-equilibrium microstructure of α-phase dendrites surrounded by eutectic mixtures of α and β（ Mg17All2 ） in the grain boundaries. With increasing welding current, the size of grains in nugget would be more smaller and uniform, and the width of plastic rings would be larger. Tensile shear tests showed that tensile shear force of the joints increased with increasing welding current when the welding current was smaller than 17 000 A. The maximum tensile shear force was up to 1980 N.
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| 关 键 词： | 焊接电流 微观结构 拉伸剪切力 镁合金 接触点焊 |
Effect of welding current on strength and microstructure in resistance spot welding of AZ31 Mg alloy |
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| Wang Yarong,Zhang Zhongdian,Feng Jicai.Effect of welding current on strength and microstructure in resistance spot welding of AZ31 Mg alloy[J].China Welding,2007,16(4):37-41. |
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| Authors: | Wang Yarong Zhang Zhongdian Feng Jicai |
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| Affiliation: | 1. Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics
2. State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001 |
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| Abstract: | In this paper, resistance spot welding were performed on 1mm-thickness magnesium AZ31B plates. The effect of welding current on the microstructure and tensile shear force was investigated. It was found that the welding current governed the nugget growth, and the nugget could not form if current levels were insufficient. The nugget revealed a homogeneous, equiaxed, fine-grained structure, which consisted of non-equilibrium microstructure of α-phase dendrites surrounded by eutectic mixtures of α and β (Mg17Al12) in the grain boundaries. With increasing welding current, the size of grains in nugget would be more smaller and uniform, and the width of plastic rings would be larger. Tensile shear tests showed that tensile shear force of the joints increased with increasing welding current when the welding current was smaller than 17 000 A.The maximum tensile shear force was up to 1980 N. |
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| Keywords: | welding current microstructure tensile shear force magnesium alloy resistance spot welding |
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