Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effect of Si content on Nugget Diameter of Electric Resistance Spot Welded Dual Phase Steel

DP강의 전기저항점용접부 너깃직경에 미치는 Si 함량의 영향

  • Kong, Jong-Pan (Dept. of Material Science and Engineering, Pusan National University) ;
  • Kang, Gil-Mo (Dept. of Material Science and Engineering, Pusan National University) ;
  • Han, Tae-Kyo (POSCO Technical Research Laboratories) ;
  • Chin, Kwang-Geun (POSCO Technical Research Laboratories) ;
  • Kang, Chung-Yun (Dept. of Material Science and Engineering, Pusan National University)
  • Received : 2011.10.19
  • Accepted : 2011.10.28
  • Published : 2011.09.30
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Abstract

In this study, effect of Si content on nugget diameter in electric resistance spot welded dual-phase(DP) steel was investigated. The cold rolled DP steels with different Si content (0.5, 1.0, 1.5, 2.0 wt.%) were used and thickness of those sheet was 1.2mm. With increasing Si content, nugget diameter was increased at the same welding current. This is attributed to increase of heat input result from high resistivity. Also, nugget diameter was increased with an increase in Si content for the same heat input. For this reason, the melting point of DP steel is lowered with an increase in the Si content. And solid DP steel can easily be transformed to a liquid phase because the low melting point. Finally, a prediction formula for the nugget diameter(N.D.) could be obtained in terms of heat input(Q) and melting point(M.P) as follows: N.D.(mm) = 0.11Q(J) - 0.0031 M.P.($^{\circ}C$) + 0.32.

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References

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