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International Journal of Automotive Technology 2006;7(5): 579-584. |
| IMPROVEMENT OF FATIGUE LIFE IN POST-WELD COLD WORKED ALUMINUM RESISTANT SPOT WELDS |
| D. KIM1, D. M. BLAKE1, Seung Jin Ryu2, Byeong-Soo Lim2 |
1Washington State University
2Sungkyunkwan University |
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| ABSTRACT |
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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. |
| Key Words:
Spot weld, Cold working, Aluminum, Fatigue, Residual Stress, Microhardness |
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