Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effects of GTAW Pulse Condition on Penetration, Discoloration and Bending Property for Titanium Tube

GTAW 펄스 용접 조건에 따른 타이타늄 정밀관의 용입, 변색 및 굽힘특성

  • Min, Seonghwan (Interdisciplinary Program in Hybrid Materials Solution, Busan National University) ;
  • An, Sungyong (Department of Materials Science and Engineering, Busan National University) ;
  • Park, Jitae (Materials development team, Samhwa steel) ;
  • Park, Youngdo (Department of Advanced Materials Engineering, Dong-Eui University) ;
  • Kang, Namhyun (Department of Materials Science and Engineering, Busan National University)
  • 민성환 (부산대학교 하이브리드소재솔루션협동과정) ;
  • 안성용 (부산대학교 재료공학과) ;
  • 박지태 (삼화스틸 소재개발팀) ;
  • 박영도 (동의대학교 신소재공학과) ;
  • 강남현 (부산대학교 재료공학과)
  • Received : 2014.11.08
  • Accepted : 2014.12.04
  • Published : 2014.12.31
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Abstract

The purpose of the study is to produce a mechanically improved weld and minimum variation of color through comparing unpulsed and pulsed GTAW (Gas Tungsten Arc Welding) for pure titanium (CP grade7) tube. Pulsed GTAW using 60 A peak current and 20 A background current (1:9) achieved the wider window of welding conditions having part and full penetration without burn-through than the case of unpulsed GTAW. Moreover, the pulsed welding reduced a discoloration on the back bead of the weld and the size of microstructures (basket weave and serrated ${\alpha}$). That is because the pulsed welding has it's a low heat input and severe weld flow induced from electric current variation. Furthermore, the pulsed welding improved the bending property of the welded Ti tube. The enhanced bending property for the pulsed GTAW was due to the insignificant discoloration on the weld surface with maintaining the metal polish.

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References

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