Technical gazette, Vol. 29 No. 4, 2022.
Original scientific paper
https://doi.org/10.17559/TV-20220407215830
Influence of Purging Gas on 316L Stainless Steel Fusion Zone in Autogenous Stationary TIG Welding
Domagoj Kojundžić
; Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Ruđera Boškovića 32, 21000 Split, Croatia
Nikša Krnić
; Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Ruđera Boškovića 32, 21000 Split, Croatia
Ivan Samardžić
; University of Slavonski Brod, Mechanical Engineering Faculty in Slavonski Brod, Trg Ivane Brlić Mažuranić 2, 35000 Slavonski Brod, Croatia
Pejo Konjatić
; University of Slavonski Brod, Mechanical Engineering Faculty in Slavonski Brod, Trg Ivane Brlić Mažuranić 2, 35000 Slavonski Brod, Croatia
Abstract
This research reveals the influence of different purging conditions on the fusion zone dimensions and shape for stationary autogenous TIG welding of 316L stainless steel. Welding experiments were performed for unpurged and purged weld root side for 7, 14 and 21 second arcing time. Purging was executed with ten seconds of pre-flow and 23 seconds of post-flow with 10 l/min Ar and 4 l/min of He. Characteristic fusion zone dimensions were extracted and calculated from photo-macrographs of weld cross-sections. Purging the weld root side by argon increased penetration depth and cross-section area compared to helium. Those benefits of argon purging can be attributed to its low thermal conductivity. Measurement of thermal cycles on the weld root side revealed that peak temperatures were higher by argon purging compared to the presence of helium or air. The fusion zone width exhibited no significant differences regardless of weld root side gas type.
Keywords
argon; autogenous TIG; fusion zone; helium; penetration; purging gas, stainless steel 316L; stationary TIG welding
Hrčak ID:
279422
URI
Publication date:
17.6.2022.
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