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J Weld Join > Volume 30(2); 2012 > Article
Journal of KWJS 2012;30(2):54-58.
DOI: https://doi.org/10.5781/KWJS.2012.30.2.54    Published online May 16, 2012.
Effect of Welding Condition and Roller on Weldability of Al Coated Steel Sheet using Plasma Arc Welding
Tae-Woo Lee, Cheol-Ho Park, Namhyun Kang, Myung-Duk Kim
Abstract
  Al-coated steel sheets with excellent heat and corrosion resistance are widely used in various applications. In welding of thin plate, some defects such as unmelted zone and metal-through occur easily in the beginning and ending of welding line. In the study, the welding defects in Al-coated steel sheets were investigated with respect to plasma arc current, height between Cu block and base metals, and using a roller to align the height of the base metal. Full penetration and voids free welds were obtained with a plasma arc current 52A and weld speed 2.3m/min. An unmelted zone increased and Ericshen rate decreased as the height between Cu block and base metal increased from 0 to 0.6㎜. Using a roller moving ahead of the plasma arc, the length of unmelted zone decreased from 1.7㎜ to 0.5㎜.
Key Words: Plasma arc weding, Al-coated steel sheet, Ericshen test


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