Original scientific paper

https://doi.org/10.21278/TOF.481054823

Influence of Argon and Helium Purging Flow Rates on the Fusion Zone in Autogenous Stationary TIG Arc Welding of 316L Stainless Steel

Domagoj Kojundžić orcid.org/0000-0001-9527-9486 ; University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, Croatia *
Nikša Krnić ; University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, Croatia
Zoran Kožuh ; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, Croatia

* Corresponding author.

Abstract

The impact of argon and helium purging flow rates of 4 l/min and 10 l/min on fusion zone dimensions and shape was investigated. Experiments were performed during an autogenous stationary TIG welding process for welding times of 7 s, 14 s, and 21 s. For a welding time of 7 s, the flow rate of the argon and helium purging gases almost did not affect the fusion zone. When the welding time was extended (14 s), the argon purging flow rate also had no significant effect on the fusion zone. However, increasing the helium purging flow rate resulted in a significant (approx. 20 %) increase in weld penetration. Arc time of 21 s and an argon flow rate of 10 l/min decreased the weld penetration by around 17 %. On the other hand, an increased helium flow rate had the opposite effect, leading to an increase of approx. 17 % in weld penetration.

Keywords

purging gas flow rate; argon; helium; fusion zone dimensions; stationary TIG welding; 316L stainless steel

Hrčak ID:

313728

URI

https://hrcak.srce.hr/313728

Publication date:

1.1.2024.

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