• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2004, Vol. 40 ›› Issue (5): 131-135.

• 论文 • 上一篇    下一篇

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AZ31B镁合金交流电阻点焊接头的力学性能及显微组织分析

王亚荣;张忠典;冯吉才   

  1. 哈尔滨工业大学现代焊接生产技术国家重点实验室
  • 发布日期:2004-05-15

MECHANICAL PROPERTIES AND MICROSTRUCTURES OF AZ31B Mg ALLOY JOINTS WELDED WITH AC RESISTANCE SPOT WELDER

Wang Yarong;Zhang Zhongdian;Feng Jicai   

  1. National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technolo
  • Published:2004-05-15

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摘要： 采用交流电阻点焊焊接了AZ31B镁合金，研究了点焊接头力学性能的变化规律，分析了点焊接头的显微组织。结果表明：接头抗剪强度随焊接规范呈规律性变化，存在最佳值；表面状态对接头拉剪强度影响很大；接头熔核区显微组织为单一的等轴晶，在a-Mg固溶体的晶界网络处析出b -Mg17Al12离异共晶体；焊点中的裂纹为沿晶热裂纹，断口显现出韧窝沿晶界撕裂的特点。

关键词: AZ31B镁合金, 交流点焊, 力学性能, 裂纹, 显微组织

Abstract: AZ31B magnesium alloy is welded by AC spot welder, mechanical properties and microstructure of the joints are studied. The results showed that tensile shear load of joints change regularly with increasing of welding variables and the optimum is up to 2 097 N. The surface conditions have significant influence on the properties of joints. There are single fine equiaxle crystals in the nugget, of which the structure is b -Mg17Al12 precipitated on a-Mg boundaries induced by non-equibrium freezing, and hot cracks in the joints. Fracture analysis results show the characteristic that dimples tear along intercrystallines.

Key words: AZ31B Mg alloy, Crack, Mechanical properties, Microstructures, Spot-welding

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