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JWJ > Volume 27(2); 2009 > Article
Journal of KWJS 2009 April;27(2) :44-50.
Published online May 18, 2009.
Effect of Heat Flux on the Melting Efficiency and Penetration Shape in TIG Welding
Dong-Soo Oh, Sang-Myung Cho

Correspondence:   Published online May 18, 2009
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.
Keywords: TIG welding;Arc pressure;Current density;Heat flux distribution;Penetration shape;Fingerbead;Dish pattern bead;Melting efficiency;Molten pool convection;Lorentz force
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