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| 高强镁合金点焊接头性能 |
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邱然锋1,2, 申中宝1, 李青哲1, 石红信1,2, 里中忍3, 木下明3
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1.河南科技大学 材料科学与工程学院, 洛阳 471023;2.有色金属共性技术河南省协同创新中心, 洛阳 471003;3.日本熊本大学 自然科学研究科, 日本 熊本 860-8555
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| 摘要: |
| 采用电阻点焊方法对高强镁合金Mg96Zn2Y2进行了焊接.通过扫描电子显微镜对接头微观组织进行了观察，分析了接头的组织，研究了焊接电流对接头熔核直径及抗剪载荷的影响.在此基础上探讨了接头组织对接头性能的影响.结果表明，接头熔核直径与抗剪载荷均随焊接电流的增大而增大，接头最大抗剪强度约为142 MPa；接头熔核区第二相呈细网状分布，其α-Mg晶粒发生了粗化，直径约为30 μm.熔核区这些组织特征被认为是接头弱化的主要原因. |
| 关键词: 镁合金 点焊 性能 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（U1204520）；河南省高等学校青年骨干教师资助计划（2013GGJS-064）；河南省高校创新人才支持计划（16HASTIT050） |
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| Property of spot weld of high strength magnesium alloy |
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QIU Ranfeng1,2, SHEN Zhongbao1, LI Qingzhe1, SHI Hongxin1,2, SATONAKA S3, KINOSHITA A3
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1.School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;2.Collaborative Innovation Center of Nonferrous Metals, Luoyang 471003, China;3.Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
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| Abstract: |
| Mg96Zn2Y2 magnesium alloy sheet was resistance spot welded. The microstructure of joint was observed by scanning electron microscope. The effect of welding current on the nugget diameter and tensile shear load of joint was analyzed. The influence of microstructure on the property of joint was discussed. The nugget diameter and tensile shear load increased with the increase of welding current. The maximum shear strength of joint, approximately 142 MPa, was obtained. Fine mesh like second phase existed in the nugget zone, α-Mg grains were approximately 30 μm in diameter. The results reveal that the microstructure characteristics were the main reason for weakening of joining strength. |
| Key words: magnesium alloy spot welding property |
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