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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

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

References

  1. Kyoung-soo Lee, Tae-ryong Kim, Jai-hak Park, Manwon Kim and Seon-yeong Cho: 3-D characteristics of the residual stress in the plate butt weld between SA508 and F316L SS, Transactions of the KSME A, 33-4 (2009), 401-408 (in Korean) https://doi.org/10.3795/KSME-A.2009.33.4.401
  2. Tae-Kwang Song, Hong-Yeol Bae, Yun-Jae Kim, Kyoung- Soo Lee, Chi-Yong Park, Jun-Seog Yang, Nam-Su Huh, Jong-Wook Kim, June-Soo Park, Min-Sup Song, Seung-Gun Lee, Jong-Sung Kim, Seung-Cheon Yu and Yoon-Suk Chang: Assessment of Round Robin Analyses Results on Welding Residual Stress Prediction in a Nuclear Power Plant Nozzle, Transactions of the KSME A, 33-1 (2009), 72-81 (in Korean) https://doi.org/10.3795/KSME-A.2009.33.1.72
  3. Tae-Kwang Song, Hong-Yeol Bae, Yun-Jae Kim, Kyoung-Soo Lee and Chi-Yong Park: Sensitivity Analyses of Finite Element Method for Estimating Residual Stress of Dissimilar Metal Multi-Pass Weldment in Nuclear Power Plant, Transactions of the KSME A, 32-9 (2008), 770-781 (in Korean) https://doi.org/10.3795/KSME-A.2008.32.9.770
  4. Section XI Task Group for Piping Flaw Evaluation of ASME Code: Evaluation of Flaws in Austenitic Steel Piping, Transactions of the ASME, Journal of Pressure Vessel Technology, 108 (1986), 352-366 https://doi.org/10.1115/1.3264797
  5. Lincoln Electric Co. : Prevent Arc Blow When Welding, Metal Forming-Richmond Heights then Independence, 35-5 (2001), 42-46
  6. A. Matsunawa, "Problems and solution in deep penetration laser welding," Sci. Technol. Weld. Joining, 6 (2001), 351-354 (in Korean) https://doi.org/10.1179/stw.2001.6.6.351
  7. Z. Tang and M. Gatzen, "Influence on the dilution by laser welding of aluminium with magnetic stirring," Physics Procedia, 5 (2010), 125-137
  8. J. Zhou and H.L. Tsai, "Effects of electromagnetic force on melt flow and porosity prevention in pulsed laser keyhole welding," Int. J. Heat Mass Transfer, 50 (2007), 2217-2235 https://doi.org/10.1016/j.ijheatmasstransfer.2006.10.040
  9. F. Vollertsen and C. Thomy, "Magnetic stirring during laser welding of aluminium," J. Laser Appl., 18 (2006), 28-34 https://doi.org/10.2351/1.2164477
  10. B.H. Dennis and G.S. Dulikravich, "Magnetic field suppression of melt flow in crystal growth," Int. J. Heat Mass Transfer, 23 (2002), 269-277
  11. O. Velde, R. Gritzki and R. Grundmann, "Numerical investigation of Lorentz force influenced Marangoni convection relevant to aluminum surface alloying," Int. J. Heat Mass Transfer, 44 (2001), 2751-2762 https://doi.org/10.1016/S0017-9310(00)00299-4
  12. M. Gatzen and Z. Tang, "CFD-based model for melt flow in laser beam welding of aluminium with coaxial magnetic field," Physics Procedia, 5 (2010), 317-326
  13. T. Fuhrich, P. Berger and H. Hugel, "Marangoni effect in laser deep penetration welding of steel," J. Laser Appl., 13 (2001), 178-186 https://doi.org/10.2351/1.1404412
  14. Y. Naito, M. Mizutani and S. Katayama, "Effect of Ambient Atmosphere on Penetration Geometry in Single Laser and Laser-Arc Hybrid Welding (report 2)," Q. Jnl. of JWS, 24-1 (2006), 39-44
  15. Chang-Je Lee, Jong-Do Kim and Yu-Chan Kim, "Characteristics of Plasma Emission Signals in Fiber Laser Welding of API Steel (II) -The Relationship between Welding Conditions and Emission Signals-," Journal of KWJS, 30-4 (2012), 314-320 (in Korean) https://doi.org/10.5781/KWJS.2012.30.4.314
  16. Tae-Jun Park, Jung-Woo, Jun il Kang, Tae-kyo Han, Kwang-Keun Chin and Chung-Yun Kang, "Effect of B Contents on Hardness Characteristic of Disk Laser Beam Welded CP Steels," Journal of KWJS, 29-1 (2011), 107-114 (in Korean) https://doi.org/10.5781/KWJS.2011.29.1.107
  17. Yong Gyu An, Chung Yun Kang, Young Su Kim, Cheol Hee Kim and Tae Kyo Han, "Microstructures and Hardness of DISK Laser Welds in Al-Si Coated Boron Steel and Zn Coated DP Steel," Journal of KWJS, 29-1, 90-98 (in Korean) https://doi.org/10.5781/KWJS.2011.29.1.090
  18. Su-Jin Lee and Jong-Do Kim, "Mechanical Properties of Cu and Ni Dissimilar Welds by High Welding Speed Using Single-Mode Fiber Laser," Journal of KWJS, 32-3 (2014), 81-88 (in Korean) https://doi.org/10.5781/JWJ.2014.32.3.81
  19. Jong-Do Kim and Jung-Han Lee and Young-Sik Kim, "A study on Weld Defect and Their Alternatives during Lap Welding of AZ31B Magnesium Alloy by Pulsed Nd:TAG Laser," Journal of KWJS, 29-3 (2011), 338-344 (in Korean)
  20. Do-Chang Ahn, Cheolhee Kim and Jaedo Kim, "Prevention of Back Side Humping in Laser Welding of Al 5J32 Alloy by using Laser Power Modulation," Journal of KWJS, 29-4 (2011), 442-446 (in Korean)
  21. Young-Nam Ahn, Cheolhee Kim, Wonbeom Lee and Jeonhan Kim, "Porosity Reduction in Laser Welding of Nitrided Carbon Steel," Journal of KWJS, 31-6 (2013), 71-76 (in Korean) https://doi.org/10.5781/KWJS.2013.31.6.71