Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effect of Heat Flux on the Melting Efficiency and Penetration Shape in TIG Welding

TIG 용접에서 열유속이 용융효율과 용입형상에 미치는 영향

  • Oh, Dong-Soo (Dept. of Industrial Facility Automation, Korea Polytechnic VII College) ;
  • Cho, Sang-Myung (Course of Materials Processing Eng., Div. of Materials Science & Engineering, Pukyong National University)
  • 오동수 (한국폴리텍VII대학 창원캠퍼스 산업설비자동화과) ;
  • 조상명 (부경대학교 신소재공학부 소재프로세스공학)
  • Published : 2009.04.30
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Abstract

The characteristics of arc pressure, current density and heat flux distribution are important factors in understanding physical arc phenomena, which will have a marked effect on the penetration, size and shape of a weld in TIG welding. The purpose of this study is to find out the effect of the heat flux on the melting efficiency and penetration shape in TIG welding using the results of the previous investigators. The conclusions obtained permit to draw a proper method which derived the heat flux distributions by arc pressure distribution measurements, but previous researchers calculated heat flux and current distribution with the heat intensity measurements by the calorimetry. Heat flux of Ar gas arc was concentrated at the central part and distributed low from the arc axis to the radial direction, that of He mixing arc was lower than that of Ar gas, and it was wide distributed to radial direction. That showed a similar characteristic with the Nestor's by calorimetry calculated values. Throughout heat flux drawn in this study was discussed melting efficiency and penetration shape on Ar gas and He mixing gas arc.

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References

  1. M. L. LIN and T, W. Eagar : Pressures Produced by Gas Tungsten Arcs, Metallurgical Transactions B, 17B(1986), 601-607
  2. K. Hiraoka, A. Okada and M. Inagaki : Effect of Electrode Geometry on Maximum Arc Pressure in Gas Tungsten Arc Wedling, Journal of JWS, 3-2(1985), 10-16(in Japanese)
  3. Sang-Myung Cho and Sang-Goun Seo : The Effect of Configuration and Surface Polishing in Tungsten Electrode Tip for Gas Tungsten Arc Welding on the Arc Characteristics, Journal of KWS, 19-1(2001), 33-39(in Korean)
  4. Nestor, O. H. : Heat intensity and current density distributions at the anode of high current, inert gas arcs, J. Appl. Physics, 33-5(1962), 1638-1648 https://doi.org/10.1063/1.1728803
  5. N. S. Tsai and T. W. Eagar : Distribution of the Heat and Current Fluxes in Gas Tungsten Arcs, Metallurgical Transactions B, 16B(1985), 841-846
  6. Peter A. Schoeck : An Investigation of the Anode Energy Blance of High Intensity Arcs in Argon, Modern Developments in Heat Transfer (IBELE, W. ED) Academic press New York, (1963), 353-400
  7. K. Hiraoka, A. Okada and M. Inagaki : Effect of Heliun Gas on Arc Characteristic in Gas Tungsten Arc Welding, Journal of JWS, 3-2(1985), 241-246(in Japanese)
  8. Dong-Soo Oh, Yeong-Sik Kim, and Sang-Myung Cho : The characteristics of Arc Pressure Distribution by Shield Gas Mixing Ratio in TIG Welding, Journal of KWS, 23-1(2005), 50-56 (in Korean)
  9. J. F. Lancaster : The Physics of Welding, Pergamon Press, England, (1984)
  10. N. S. Tsai, : Heat Distribution and Weld Geometry in Arc Welding, Doctor of Philosophy, MIT, (1983)
  11. G. R. Cannell and R. P. Ruth : Closing Spent Nuclear Fuel Canisters with GTAW, welding Journal, 82-12(2003), 28-32
  12. A. C. Guu and S. I. Rokhlin : Technique for Simultaneous Real-Time Measurements of Weld Pool Surface Geometry and Arc Force, Welding Journal, 71-12(1992), 473s-482s
  13. Dong-Soo Oh, Yeong-Sik Kim, and Sang-Myung Cho : Derivation of Current Density Distribution by Arc Pressure Measurement in TIG Welding, Journal of Science and Technology of Welding and Joining, 10-4(2005), 442-446 https://doi.org/10.1179/174329305X44116
  14. Dong-Soo Oh, Yeong-Sik Kim, and Sang-Myung Cho : Effect of He Mixing Ratio on the Characteristics in TIG Welding with High Current and Speed, Journal of KWS, 23-3(2005), 52-58 (in Korean)
  15. T. Hinata, K. Yasuda, H. Kasuga and T. Onzawa : Study on Penetration Form Using Stationary TIG Arc(Study on Low Speed DC-TIG Welding Method(Report 1), Journal of JWS, 10-3(1992), 352-359(in Japanese)
  16. A. Okada and H. Nakamura : Anode Behavior in GTA Welding and Its Effect on Melting Thin Plate, JWS 12-1(1994), 94-100 (in Japanese)
  17. J. Tusek, M. Suban : Experimental research of the effect oh hydrogen in argon as a shielding gas in arc welding of high-alloy stainless steel, International Journal of Hydrogen Energy 25 (2000), 369-376 https://doi.org/10.1016/S0360-3199(99)00033-6
  18. A. Katsaounis, Heat Flow an Arc Efficiency at High Pressures in Argon and Helium Tungsten Arcs, Welding Journal 72-9(1993), 447s-454s