Effect of Be Mixing Ratio on the Characteristics of TIG Welding with High Current and High Speed

대전류 고속 TIG 용접 특성에 미치는 He 혼합비의 영향

  • Oh Dong-Soo (Dept. of Plant Facility Automation, Changwon Polytechnic College) ;
  • Kim Yeong-Sik (Major of Machine Design & Manufacturing Automation Eng., Div. of Mechanical Engineering, Pukyong National University) ;
  • Cho Sang-Myung (Course of Materials Processing Eng., Div. of Materials Science & Engineering, Pukyong National University)
  • 오동수 (창원기능대학 플랜트설비자동화과) ;
  • 김영식 (부경대학교 기계공학부 기계설계, 생산자동화공학) ;
  • 조상명 (부경대학교 신소재공학부 소재프로세스공학)
  • Published : 2005.06.01

Abstract

Tungsten Inert Gas(TIG) welding is today one of the most popular arc welding process because of its high quality welds and low equipment costs. Even if welding productivity increases with welding speed and current, this strategy is limited by the appearance of defects such as undercut and humping bead due to the depressed molten metal. The purpose of this study investigates the effect of He mixing ratio on the characteristics with high current and speed in TIG welding. The conclusions obtained permit to explain the arc start characteristics quantitatively and the maximum welding speed on stable bead formation with He mixing ratio for high current and speed TIG welding observed in experiments. Also through the relation of the maximum arc pressure and surface depression depth at high current and speed TIG welding, it made clear the mechanism of unstable bead formation.

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