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JWJ > Volume 28(6); 2010 > Article
Journal of KWJS 2010 December;28(6) :21-27.
Published online January 10, 2011.
Control of Molten Pool by Physical Force of Bead Former in TIG Welding of Overhead and Inclined-up Position
Hyo-Sik Ham, Jong-Moon Ha, Byung-Woo Lee, Sang-Myung Cho

Correspondence:   Published online January 10, 2011
  Due to excellent weld quality, orbital welding with TIG is widely applied to pipe welding. But concave back bead is formed easily in overhead and inclined-up position of butt orbital welding. It is difficult to find a paper to overcome this problem. In this study, in order to make convex back bead in overhead and inclined-up position of pipe 5G welding, control method of molten pool was actively investigated. Melt run welds were conducted on thickness 4.0mm SS400 with overhead and inclined-up position and was observed the variation of bead shape after welding with the bead former developed. The height of back bead showed the trend of increase as the distance from molten pool to the bead former was decreased. Also, there is no trend in the bead width of front and back as welding position was changed or the distance from molten pool to the bead former was decreased.
Keywords: TIG welding;Orbital welding;Overhead position;Inclined-up position;5G welding;Convex back bead;Concave back bead;Bead former;Distance from molten pool to the bead former
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