International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
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IMPROVEMENT OF FATIGUE LIFE IN POST-WELD COLD WORKED ALUMINUM RESISTANT SPOT WELDS

  • Kim, D. (School of Engineering and Computer Science, Washington State University Vancouver) ;
  • Blake, D.M. (School of Engineering and Computer Science, Washington State University Vancouver) ;
  • Ryu, S.J. (Graduate School, Sungkyunkwan University) ;
  • Lim, B.S. (School of Mechanical Engineering, Sungkyunkwan University)
  • Published : 2006.08.01
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Abstract

Aluminum Resistance Spot Weld(Al RSW) is an enabling technology for body assembly of low mass fraction vehicles. Due to the unreliable durability of spot-welded joints, applications of Al RSW are limited. This study presents experimental investigation on the use of a post-weld cold working process to improve the fatigue strength of Al RSW. The post-weld cold working process includes special shaped indenters that are pressed or driven into the structure to induce compressive residual stresses. The mechanical properties of the post-weld cold worked Al RSW were investigated, including the experimental results of fatigue and micro-hardness tests. Comparisons of the mechanical properties and qualitative results between the as-welded RSW specimens and the post-weld cold worked RSW specimens are discussed. The post-weld cold worked Al RSW samples had an increase in both microhardness and fatigue life.

Keywords

References

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