Analysis of Electro-Magnetic Force Acting on Are Column in Butt-Joint Welding of Mild Steel Plate

Bae, Kang-Yul

Journal of KWJS 2005;23(4):73-80.
Published online September 22, 2005.

[연구논문]연강 판재의 맞대기 용접에서 아크에 작용하는 자기력의 해석

Analysis of Electro-Magnetic Force Acting on Are Column in Butt-Joint Welding of Mild Steel Plate

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 workpice locates asymmetrically around the arc. 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 on fourth at the finish end of the workpiece. The magnetic force can be also significantly reduced with the base plate to about on fifth at the start end of the workpiece containing a tack weld.