Visualizations of fluid flows in the TIG welding r

Authors: Yoon Hwan Choi Yeon Won Lee Ji Seok Seo Sang Myung Cho Deog Hee Doh

Publish Date: 2011/05/01

Volume: 14, Issue: 3, Pages: 213-224

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Abstract

The tungsten inert gas TIG welding enables to produce high welding qualities However it has some problems such as a large distortion and a shallow penetration into the welding parts To overcome those problems there have been many studies on ATIG welding in which active flux and a shield gas are used The shield gas pressure velocity and distribution area are dominant factors in producing better welding condition which can be evaluated by the gas penetration the gap between the nozzle tip and welding plate and the nozzle shape of the shield gas In this study the influences of the shield gas distribution onto the melting efficiency and penetration shape in TIG welding were investigated using a numerical simulation The gap distances between the nozzle tip and the welding plate were changed 3 4 5 mm and two nozzle shapes convergent parallel CP and CDP were tested 100 Ar gas was used as the shield gas CDP type nozzle showed deeper penetrations and higher melting efficiency compared to those of CD type and CP type nozzles

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