ANODE HEATING AND MELTING IN THE ARGON GTA

  • Terasaki, Hidenori (Joining and Welding Research fustitute, Osaka University) ;
  • Tanaka, Manabu (Joining and Welding Research fustitute, Osaka University) ;
  • Fujii, Hidetoshi (Joining and Welding Research fustitute, Osaka University) ;
  • Ushio, Masao (Joining and Welding Research fustitute, Osaka University)
  • Published : 2002.10.01

Abstract

In order to make clear the physical relation among the arc plasma, the anode heat transfer and the weld penetration, the results of experimental measurements of temperatures of arc plasma, the distributions of heat input and current on the anode and the weld penetration were presented The experimental results showed that the electron temperature above the anode and current and heat input density on the anode was dominated by the position of the cathode. Furthermore, it was showed that electron temperature of arc plasma was dominated by the cathode shape. These results were related with the results of the welded penetration measurements. As a result, it was showed that the electron temperature above the anode and current density distribution on the anode decided the heat input density distribution on the anode and that the heat input density on the anode remarkably dominated the size of the weld penetration in argon GTA welding process. Furthermore, it was suggested that the cathode played the important role in the determination of the weld penetration in argon GTA welding process.

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