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The Validity of Using ASTM A923 Practice for Weld Procedure Qualification of 2507 Duplex SSs

There is no confidence in the A923 Test Method C for weld procedure
qualification of 25% Cr DSS on a consistent basis. The ability to obtain corrosion
rates < 10 mdd is not achievable at 40°C for samples in the “as-welded”
condition.

Product Number: 51317--8838-SG
ISBN: 8838 2017 CP
Author: Richard Colwell
Publication Date: 2017
Industry: Test Method
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$20.00
$20.00

ASTM A923 provides three methods/practices to determine the extent of intermetallic precipitation in Duplex Stainless Steels. While Practice A (electrolytic NaOH) etch can be used it is sometimes not permitted for this purposeby user speciifations. THis leaves practiceB (CVN testing @ -40?C)and practice C Ferric Chloride exposure/corrosion rate testing) to qualify the welding procedure for corrosive environments. The practice C test is difficult to pass and is entirely non repeatable. While it is an effective test in dtermining the microstructural state of the base metal it is not appropriate for weldments especially the root pass. Date presented in this paper will illustrate the problems using ASTM A923 practice C for WPQR development.

Key words: conference papers, 2017 conference papers

ASTM A923 provides three methods/practices to determine the extent of intermetallic precipitation in Duplex Stainless Steels. While Practice A (electrolytic NaOH) etch can be used it is sometimes not permitted for this purposeby user speciifations. THis leaves practiceB (CVN testing @ -40?C)and practice C Ferric Chloride exposure/corrosion rate testing) to qualify the welding procedure for corrosive environments. The practice C test is difficult to pass and is entirely non repeatable. While it is an effective test in dtermining the microstructural state of the base metal it is not appropriate for weldments especially the root pass. Date presented in this paper will illustrate the problems using ASTM A923 practice C for WPQR development.

Key words: conference papers, 2017 conference papers

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