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http://dx.doi.org/10.5762/KAIS.2012.13.4.1460

Development of Semi-automatic Gas Metal Arc Welding Equipment for Fire Piping and Evaluation of Characteristics of Weld Joints  

Lim, Young-Min (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Oh, Tae-Suk (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Jo, Hyun (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Koh, Jin-Hyun (School of Energy.Materials.Chemical, Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.4, 2012 , pp. 1460-1465 More about this Journal
Abstract
The semi-automatic gas metal arc welding equipment was developed and the weldability of zinc coated steel pipes was evaluated in terms of strength, porosity and welding parameters including shielding gas composition. The good bead appearance and the reduction of porosity in the welds could be possibly obtained by adding $O_2$ to Ar. The strength and joint efficiency of welds made by the semi-automatic welding equipment was about 1.8 times higher compared with welds manually made. The integrity of welds was confirmed by the water pressure test as well, Finally, it is expected that the weld productivity will be enhanced even unskilled welders can produce quality welds by operating the semi-automatic welding equipment.
Keywords
Zinc coated steel pipes; Semi-automatic GMA welding equipment; Porosity; Shielding gas;
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