Fig. 1 — Structures observed in UNS S31803 as a result of ASTM A923 Test Method A. A — Unaffected Structure (500×); B — Possibly Affected Structure (500×); C — Affected Structure (500×). (Reprinted with permission from ASTM A92314, Detecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steels, copyright ASTM International, 100 Barr Harbor Dr., West Conshohocken, PA 19428. A copy of the complete standard may be obtained from ASTM, astm.org.) WJ fected Structure that would not be accepted without successfully passing Test Method B or Test Method C — a successful test of material similar to that of Fig. 1C by either Test Method B or Test Method C seems to me to be highly unlikely. So, the correct way to apply ASTM A923 testing is to conduct Test Method A first, and do nothing further if that test reveals an Unaffected Structure. Given the heat input and maximum interpass temperature stated during the inquiry, which are both within normally specified limits for 2205 welding, I would expect an Unaffected Structure. Intermetallic precipitation seems unlikely under such welding conditions. Follow-up: The fabricator conducted Test Method A and found an Unaffected Structure. The PQR was accepted. Standard Test Methods for DAMIAN J. KOTECKI is president, Damian Kotecki Welding Consultants, Inc. He is treasurer of the IIW and a member of the A5D Subcommittee on Stainless Steel Filler Metals, D1K Subcommittee on Stainless Steel Structural Welding; and WRC Subcommittee on Welding Stainless Steels and NickelBase Alloys. He is a past chair of the A5 Committee on Filler Metals and Allied Materials, and served as AWS president (2005–2006). Questions may be sent to Damian J. Kotecki c/o Welding Journal, 8669 NW 36 St., # 130, Miami, FL 33166, or via email at damian@damiankotecki.com. MARCH 2016 / WELDING JOURNAL 19 For info, go to www.aws.org/adindex
Welding Journal | March 2016
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