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Mechanical and fatigue properties of resistance spot-welded AA 5182 sheets.

机译:电阻点焊AA 5182板材的机械性能和疲劳性能。

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摘要

Although aluminum materials have proven to be a possible weight saving solution, the strength of Al joints remains a challenge in auto industry. Improving the mechanical properties of resistance spot welding, as a major joining method, has been the subject of numerous studies. However, the effects of forging on the mechanical properties of Al spot-welded joints had not been yet determined.; Systematic tensile/fatigue tests and microstructural characterization were conducted on three sets of aluminum DC single-phase spot-welds. The results showed an enhancement in the fatigue life as the result of forging. Crack initiation occurred out of the weld pool in the heat affected zone at the end of the notch, where the stress concentration is highest. No correlation was detected between fatigue life and weld pool microstructure. Residual stress analysis on the weld pool and its vicinity is recommended to clarify if forging impacts the residual stress relieving mechanism.
机译:尽管已证明铝材料可能是一种减轻重量的解决方案,但铝接头的强度仍是汽车行业的一项挑战。作为主要的连接方法,提高电阻点焊的机械性能一直是众多研究的主题。然而,锻造对铝点焊接头力学性能的影响尚未确定。在三套铝制直流单相点焊机上进行了系统的拉伸/疲劳试验和微观结构表征。结果表明,由于锻造,疲劳寿命提高。在缺口末端的热影响区(应力集中最高)的熔池外发生裂纹萌生。在疲劳寿命和焊缝微观结构之间未发现相关性。建议对焊缝池及其附近的残余应力进行分析,以弄清锻造是否会影响残余应力消除机制。

著录项

  • 作者

    Heidar Zadeh, Farnoush.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Engineering Materials Science.
  • 学位 M.A.Sc.
  • 年度 2004
  • 页码 92 p.
  • 总页数 92
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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