[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5781/KWJS.2011.29.3.307

A Study on Optimum Shape of Shield Gas Nozzle for Bead Shape Control in TIG Welding using Gas Force (Ⅰ) - Design and Performance Analysis of Venturi Nozzle -

Ham, Hyo-Sik (Graduate school, Dept. of Materials Processing Eng., Pukyong National Univ.)
Seo, Ji-Seok (Graduate school, Dept. of Shipbuilding Systems Management Eng., Pukyong National Univ.)
Choi, Yoon-Hwan (Dept. of Mechanical and Automotive Eng., Pukyong National Univ.)
Lee, Yeon-Won (Dept. of Mechanical and Automotive Eng., Pukyong National Univ.)
Cho, Sang-Myung (Div. of Advanced Materials Sci. and Eng,. Pukyong, National Univ.)

Publication Information

Journal of Welding and Joining / v.29, no.3, 2011 , pp. 51-57 More about this Journal

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 designed by using the Venturi meter and compared velocity, pressure, arc shape in the flat position with existing CP-nozzle. As a result, Venturi-type nozzle's maximum velocity and pressure was improved at the same flow rate. Also heat input was increased by the arc contraction in the flat position.

Keywords

TIG welding; Orbital welding; Nozzle shape; Venturi-type nozzle; Shield gas velocity; Shield gas pressure; Gas force;

Citations & Related Records

Times Cited By KSCI : 5 (Citation Analysis)

Reference
Cited By KSCI

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2	Jin-Woo Kim, Sang-Myung Cho : The effect of the arc pressure variation on the penetration by the filler wire feed rate in pulsed TIG welding, Journal of KWS, 22-1 (2004), 169-171 (in Korean)
3	Ki-joung Kim, Jin-Woo Kim, Youn-Bae Kang, Sang-Myung Cho : Heat input control in orbital GTA welding to stainless steel and mild steel pipes, Journal of KSME, (2002. 11), 2881-2885 (in Korean)
4	Hyo-Won Kim, Sang-Myung Cho : A Study on Back Bead Formation in Inclined-up Position of Plasma Arc Orbital Welding, Journal of KWJS, 27-1 (2009), 71-78 (in Korean) 과학기술학회마을 DOI ScienceOn
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6	Ji-Seok Seo, Hyo-Sik Ham, Sung-Bin Im, Jong-Moon Ha, Chang-Hee Son and Sang-Myung Cho : Control of Bead Geometry and Effect of Protection against Wind according to the CDP Gas Nozzle in Arc Welding, Abstracts of the Autumn Annual Meeting of KWJS, 52 (2009), 25 (in Korean) 과학기술학회마을
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