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首页> 外文期刊>Journal of Manufacturing Processes >A comparative study on mechanical performance of traditional and magnetically assisted resistance spot welds of A7N01 aluminum alloy
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A comparative study on mechanical performance of traditional and magnetically assisted resistance spot welds of A7N01 aluminum alloy

机译：A7N01铝合金传统磁辅助耐热点焊的力学性能比较研究

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摘要

In this paper, an external magnetic field was introduced to resistance spot welding (RSW) to improve the weldability of A7N01 aluminum alloy. Comparative studies of the macro- and micro-structures, microhardness, and the static and dynamic mechanical properties between welds produced by traditional RSW and magnetically assisted RSW (MA-RSW) were completed. The results show that the external magnetic field could enable larger nugget diameter, the softened columnar grain zone (CGZ-I), the hardened columnar grain zone (CGZ-II) and the finer equiaxed grain zone (EGZ). As a result, compared to traditional RSW joints, the MA-RSW joints exhibited better strength, improved toughness, and greater energy absorption capacity. This resulted in a transition of the failure mode from an interfacial fracture (IF) to a partial thickness fracture (PTF) in lap-shear tests and a BP fracture in cross-tension tests, respectively. In fatigue tests, the larger nugget diameter, hardened CGZ-II and finer EGZ in the MA-RSW welds can inhibit cracks from propagating from EGZ, but from the softened CGZ to the base metal. This change of fracture mode greatly improved the fatigue life of MA-RSW welds under both high and low load conditions.
机译：本文将外部磁场引入电阻点焊（RSW），以提高A7N01铝合金的可焊性。通过传统RSW和磁辅助RSW（MA-RSW）产生的宏观和微观结构，微硬度和静态和动态机械性能的比较研究完成。结果表明，外部磁场可以使巨大的块状直径，软化的柱状晶粒区（CGZ-I），硬化的柱状晶区（CGZ-II）和更精细的等式晶粒区（EGZ）。结果，与传统的RSW关节相比，MA-RSW关节表现出更好的强度，改善韧性和更大的能量吸收能力。这导致失效模式从界面骨折（IF）转变为循环剪切试验中的部分厚度裂缝（PTF）和交叉张力试验中的BP骨折。在疲劳试验中，MA-RSW焊缝中的较大的块状直径，硬化的CGZ-II和更精度的EGZ可以抑制从EGZ传播的裂缝，而是从软化的CGZ到基础金属。这种裂缝模式的变化大大提高了高负荷条件下MA-RSW焊缝的疲劳寿命。

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  • 来源
    《Journal of Manufacturing Processes》 |2021年第6期|133-144|共12页
  • 作者

    Qi Lin; Zhang Qingxin; Ma Yunwu; Xu Ye; Han Xiaohui; Li Yongbing;

  • 作者单位

    Shanghai Jiao Tong Univ Shanghai Key Lab Digital Manufacture Thin Walled Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Shanghai Key Lab Digital Manufacture Thin Walled Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China;

    Osaka Univ Joining & Welding Res Inst Osaka 5670047 Japan;

    CRRC Qingdao Sifang Co Ltd Qingdao 266111 Peoples R China;

    CRRC Qingdao Sifang Co Ltd Qingdao 266111 Peoples R China;

    Shanghai Jiao Tong Univ Shanghai Key Lab Digital Manufacture Thin Walled Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Resistance spot welding (RSW); Magnetic assisted resistance spot welding (MA-RSW); Electromagnetic stirring; Aluminum alloy; Fatigue;

    机译：电阻点焊（RSW）;磁辅助电阻点焊（MA-RSW）;电磁搅拌;铝合金;疲劳;

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