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JWJ > Volume 26(2); 2008 > Article
Journal of KWJS 2008 April;26(2) :75-84.
Published online June 18, 2008.
A Comparison of Spot Weldability with Electrode Force Changes in Surface Roughness Textured Steel
Sang-Soon Park, Yeong-Do Park, Ki-Hong Kim, Yung-Min Choi, Young-Mok Rhym, Nam-Hyun Kang





Correspondence:   Published online June 18, 2008
ABSTRACT
  With the development of surface roughness textured steel for automotive body-in-white assemble, one of key issues is to understand the role of the surface roughness in textured steel sheets. To investigate effect of surface roughness on weldability in prepared steels, electrode force was varied. Steel sheets (T-H) with high surface roughness (Ra = 1.94 ㎛) reduced electrode life. It was attributed to the higher contact resistance at the electrode-sheet interface in the presence of the high surface roughness. The increased electrode diameter decreased current density, therefore reducing weld electrode life due to small weld button size. When an increased electrode force was used, a significant increase in the electrode life was observed in welding of high surface roughness steel sheet. This study suggested that contact resistance at the electrode-sheet interface was the dominant factor, as compared to the sheet-sheet interface for determining electrode life in welding of surface roughness textured steel.
Keywords: Spot welding;Surface roughness;Electrode force;Electrode life;Contact resistance
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