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JWJ > Volume 28(4); 2010 > Article
Journal of KWJS 2010 August;28(4) :67-72.
Published online September 8, 2010.
A Study on the Arc Characteristics and Weld Pool Analysis of GHTAW under the Space Environment
Sang-Hoon Lee, Suck-Joo Na

Correspondence:   Published online September 8, 2010
ABSTRACT
  The purpose of this paper is to understand the behavior of GHTAW process under the space environment with the experimental and numerical analysis. Gas Hollow Tungsten Arc Welding (GHTAW) using a hollow tungsten electrode was adopted, since the ignition and discharge of a conventional GTAW process is not appropriate to the space environment due to low pressure in space. In order to clarify the phenomena of GHTAW under space environment, an investigation of thermal and physical properties of the GHTAW arc plasma was experimentally performed under low pressure conditions. Furthermore, the molten pool behavior and weldment of GHTAW were understood by CFD-based numerical analysis, based on the models of GHTA heat source, arc pressure and electromagnetic force induced by arc plasma, the characteristics of which were obtained by the captured images of a CCD camera.
Keywords: GHTAW;Arc plasma;Numerical simulation;Heat source;Modeling;Space welding;Molten pool
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