Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Development of Semi-automatic Gas Metal Arc Welding Equipment for Fire Piping and Evaluation of Characteristics of Weld Joints

소방배관용 강관을 위한 반자동 가스메탈아크용접장치 개발과 용접부 특성평가

  • 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)
  • 임영민 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 오태석 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 조현 (한국기술교육대학교 에너지.신소재.화학공학부) ;
  • 고진현 (한국기술교육대학교 에너지.신소재.화학공학부)
  • Received : 2012.02.29
  • Accepted : 2012.04.12
  • Published : 2012.04.30
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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.

본 연구에서는 소방배관용 아연도금 강관을 용접하기 위하여 반자동 가스메탈아크용접장치를 개발하고 최적 용접 조건을 확립하고 용접성을 조사하기 위해 보호가스, 전압을 변화시켜 용접시험을 수행하였다. Ar 가스에 $O_2$를 첨가함으로써 미려한 비드외관과 기공률이 감소되었다. 반자동 용접부는 기계적 강도와 용접이음효율이 수동용접부에 비해 약 1.8배 우수하였으며 수압시험에 의해 건전성이 확인되었다. 본 연구에서 개발된 반자동용접장치로 비숙련자도 강관용접이 가능하며 용접결함이 적고 용접생산성을 증대시킬 수 있을 것으로 기대된다.

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