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JWJ > Volume 30(2); 2012 > Article
Journal of KWJS 2012 April;30(2) :76-80.
Published online May 16, 2012.
doi:https://doi.org/10.5781/KWJS.2012.30.2.76
Hardness Distribution and Microstructures of Electric Resistance Spot Welded 1GPa Grade Dual Phase Steel
Hye-Sung Na, Jong-Pan Kong, Tae-Kyo Han, Kwang-Geun Chin, Chung-Yun Kang




Correspondence:   Published online May 16, 2012
ABSTRACT
  In this study, the effect of the welding current on the hardness characteristics and microstructure in the resistance spot welding of 1GPa grade cold-rolled DP steel was investigated, Also, correlation between the hardness and microstructure was discussed. In spite of the change in the welding current, the hardness distributions near weld was similar. the hardness in the HAZ and the fusion zone was higher than that of the base metal and the hardness in the fusion zone was variated with the location. Especially, the hardness of HAZ adjacent to the base metal showed maximum value, and softening zone in the base metal adjacent to HAZ was found. With the increasing of welding current, there were no difference in maximum hardness and average hardness in the fusion zone were, but the hardness of the softening zone reduced. The difference in the hardness in each location of weld due to grain size of prior austenite. The softening of the base metal occurred by tempering of the martensite.
Keywords: DP steel;Electric resistance spot welding;Welding current;Hardness;Microstructure;Softening
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