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JWJ > Volume 24(5); 2006 > Article
Journal of KWJS 2006 October;24(5) :49-56.
Published online January 4, 2007.
Improvement of Gap Bridging Ability in CO₂ Laser-GMA Hybrid Welding
Hyunbyung Chae, Cheolhee Kim, Jeong-Han Kim, Sehun Rhee



Correspondence:   Published online January 4, 2007
ABSTRACT
  For laser welding in shipbuilding industry, gap bridging capability is one of the most important characteristics to achieve the high productivity and good weld quality. Recently, laser-GMA hybrid welding process is regarded as a distinctive method to overcome the tight gap tolerance with improving the productivity. In this study, the influence of process parameters on the bead formation was experimentally analyzed and the relationship between the process parameters and geometric imperfections was investigated. It was revealed that undercut, excessive weld metal, excessive penetration and incompletely filled groove were the major geometric imperfections. The optimized wire feeding and arc pressure were necessary to ensure the gap bridging ability. The approach to select the process parameters was conducted for butt welding with up to 2㎜ joint gap, in which the sound weld beads were generated without changing the welding speed.
Keywords: Shipbuilding;Gap bridging capability;Laser-GMA hybrid welding;Geometric imperfection
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