Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study of the Effect of Magnetic Fields Using Welding Process

용접 공정에서 자기력의 효과에 대한 연구

  • Cho, Hong Seok (Graduate School of Energy and Environment, Seoul National University of Science and Technology) ;
  • Park, Ik Keun (Mechanical and Automotive Engineering, Seoul National University of Science and Technology) ;
  • Lee, Wooram (Graduate School of Energy and Environment, Seoul National University of Science and Technology)
  • 조홍석 (서울과학기술대학교 에너지환경 대학원 에너지 시스템 공학과) ;
  • 박익근 (서울과학기술대학교 기계.자동차공학과) ;
  • 이우람 (서울과학기술대학교 에너지환경 대학원 에너지 시스템 공학과)
  • Received : 2014.05.14
  • Accepted : 2014.10.22
  • Published : 2014.10.31
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Abstract

Welding and joining technology has become a core field. Therefore it is more widely applied to nonferrous metals, inorganic and polymeric materials. That is because the high performance, high function and diversification trend of materials used as industrial technology develops. In the laser welding process, STS 304 and SCP1-S were used as the base materials, the output density was fixed $7MW/cm^2$, the protective gas was argon(Ar) and the transfer rate was fixed 5 mm/sec. and it was progressed while the magnetic field is gradually increasing by 100 mT ranging 0 to 400 mT. The tensile test showed in average about 6 % tensile strength improvement in the case of the laser welding process using the magnetic fields. In the shielded metal arc welding process using SPHC only or the combination of SPHC+STS304 as base materials. The electric current was set at 80 Amperes and the protective gas used argon(Ar) the same as the laser welding process and the strength of magnetic fields. In the shielded metal arc welding process using the magnetic fields, the tensile tests showed about 5 % tensile strength improvement in the case of using SPHC only, 3 % tensile strength improvement in the case of using the combination of SPHC+ STS304. In comparing the results of numerical analysis to the results of experimental tests, it was revealed that the temperature, thermal stress distribution and the behavior of molten pool were similar to those of real tests. Consequently, it may be considered that the numerical assumption and the analytical model used in this study were reasonable.

Keywords

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