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Journal of KWJS 2011;29(3):58-63.
Published online July 7, 2011.
TIG용접에서 가스력을 이용한 비드형상제어를 위한 실드가스 노즐의 최적 형상에 관한 연구 (Ⅱ)벤투리 노즐의 위보기 자세 용융금속제어 효과
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A Study on Optimum Shape of Shield Gas Nozzle for Bead Shape Control in TIG Welding using Gas Force (Ⅱ) - Effect of Molten Metal Control by Venturi Nozzle in Overhead Position
Hyo-Sik Ham, Ji-Seok Seo, Yoon-Hwan Choi, Yeon-Won Lee, Sang-Myung Cho
Abstract
  Bead shape control with gas force process has been developed to overcome the concave back bead in pipe orbital welding. However, It is impossible to make a convex back bead using the existing gas nozzle, because it has high gas-consuming and low gas force. The purpose of this paper, to develop optimum shape of nozzle which to reduce the consumption of gas, maximizing the shield gas force with low cost and high productivity coincide the Green welding. In this paper venturi-type nozzle was compared with existing CP-type nozzle by TIG pulse welding in overhead position. As a result, CP-type occurs the wormholes in the overhead position, but the Venturi-type without the pore and formed a good bead appearance.
Key Words: TIG welding, Orbital welding, Nozzle shape, Venturi-type nozzle, Shield gas velocity, Shield gas pressure Overhead position, Moltenpool vibration, Wormhole formation, Gas force


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