The effects of He-Ar-O2 shielded gas addition on GTA welding on welded shape of UNS S31803 duplex stainless steel

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Publication Details

Author list: Nansaarng S., Sopha S.

Publisher: Trans Tech Publications

Publication year: 2011

Volume number: 214

Start page: 325

End page: 328

Number of pages: 4

ISBN: 9783037850633

ISSN: 1022-6680

eISSN: 1662-8985

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-79952412990&doi=10.4028%2fwww.scientific.net%2fAMR.214.325&partnerID=40&md5=957b9f7ea5b1024e7ae33a297b81d1b5

Languages: English-Great Britain (EN-GB)

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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. ฉ (2011) Trans Tech Publications.

Keywords

Austenite/ferrite phase, Duplex stainless steel, Marangoni convection, Mixed shielding gas, Weld shape