The Effects of He–Ar-O₂ Shielded Gas Addition on GTA Welding on Welded Shape of UNS S31803 Duplex Stainless Steel

Abstract:

The effects of oxygen in helium-argon base shielded GTAW on weld shape of weld penetration are systematically investigated by bead-on-pale welding on UNS S31803 duplex stainless steel. The results show that amount of oxygen addition to He-Ar mixed shielding can significantly change the weld shape from a wide narrow type to narrow deep one and the weld depth/width ratio can be doubled due to the change in Marangoni convection condition from an outward to an inward direction.

• Periodical: Advanced Materials Research (Volume 214)
• Pages: 325-328
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.214.325
• Online since: February 2011
• Authors: Santirat Nansaarng, Suthiphong Sopha
• Keywords: Austenite/Ferrite Phase, Duplex Stainless Steel, Marangoni Convection, Mixed Gas Shielding, Weld Shape

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