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

Bae Kang-Yul (Dept. of Mechatronics Engineering, Jinju National University)
Publication Information
Journal of Welding and Joining / v.23, no.4, 2005 , pp. 73-80 More about this Journal
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
Magnetic-flux density; Electro-magnetic force; Groove size; Base plate; Finite element method; Equivalent external magnetic field; Arc blow;
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