Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Analysis of Electro-Magnetic Force Acting on Arc Column in Butt-Joint Welding of Mild Steel Plate

연강 판재의 맞대기 용접에서 아크에 작용하는 자기력의 해석

  • Bae Kang-Yul (Dept. of Mechatronics Engineering, Jinju National University)
  • 배강열 (진주산업대학교 메카트로닉스공학과)
  • Published : 2005.08.01
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Abstract

Arc blow being occurred by Electro-Magnetic force(EMF) during the electric arc welding prevents the formation of a sound weldment. In this study, the effects of arc position, groove size, tack weld and base plate on the EMF in a butt-joint welding of mild steel plate are analyzed by a computer simulation based on the finite element method. The EMF can be numerically identified to be caused by a difference of the magnetic flux-density between ahead of and behind the arc in case that the workpiece locates asymmetrically around the uc. When there exists an air gap of groove ahead of the arc in the welding direction, the similar magnetic force has been producted regardless of the arc position and the gap size. The tack weld alleviates the magnetic force to about one fourth at the finish end of the workpiece. The magnetic force can be also significantly reduced with the base plate to about one fifth at the start end of the workpiece containing a tack weld.

Keywords

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