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JWJ > Volume 30(6); 2012 > Article
Journal of KWJS 2012 December;30(6) :42-48.
Published online December 23, 2012.
doi:https://doi.org/10.5781/KWJS.2012.30.6.528
A Experiment Study on Selection the Optimal Condition for GMA Root-pass Welding in Overhead and Vertical Position
Ji-Sun Kim*, In-Ju Kim*, Ill-Soo Kim**
*Green mold Technology Center, Korea Institute of Industrial Technology, Gwang-ju 500-460, Korea
**Department of Mechanical Engineering, Mokpo Univ, Mokpo 534-729, Korea
Correspondence: In-Ju Kim  Email: k9inju@kitech.re.kr
  Published online December 23, 2012
ABSTRACT
Due to increase in demand of stable and long pipelines in natural gas industry, wide range of researches are being performed on automation welding to improved welding quality with respect to weld process parameters in real time measurement. In particular, the coupling between the pipe manufacturing process and location of the weld seam, the measured size of the gap that exists in the weld position and the weld angle depending on whether the movement of molten weld. This is due to absence of controlling welding penetration position, depending on the required size of the angle of the setting. In addition, the optimum welding conditions must be considered while selecting, the correlation between these variables and the systematic correlation has not yet been identified. Therefore, in most welded pipe root-pass weld solely depends on the experience of workers in relation to secure a stable weld quality. In this study, automation welding system is implemented to select a suitable root-pass STT (Surface Tension Transfer) welding method using the optimal welding conditions. To successfully accomplish this objective, there were various welding conditions used for welding experiment to confirm that the assessment required for construction through the pipe and automatic welding process is proposed to optimize this plan.
Keywords: Root-pass welding | STT(Surface tension transfer) | Open-gap | Vertical welding | Overhead welding
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