| Mr Larry, As per to the ASME IX QW-423 Alternate Base Materials for Welder Qualification QW-423.1 Base metal used for welder qualification May be substituted for the metal specified in the WPS in Accordance with the following table. When a base metal Shown in the left column is used for welder qualification, The welder is qualified to weld all combinations of base Metals shown in the right column, including unassigned Metals of similar chemical composition to these metals. Base Metals for Welder Qualified Production Qualification Base Metals P-No. 1 through P-No. 15F, P-No. 1 through P-No. 15F, P-No. 34, and P-No. 41 P-No. 34, and P-No. 41 Through P-No. 49 through P-No. 49 P-No. 21 through P-No. 26 P-No. 21 through P-No. 26 P-No. 51 through P-No. 53 or P-No. 51 through P-No. 53 and P-No. 61 and P-No. 62 P-No. 61 and P-No. 62 QW-452.3 GROOVE-WELD DIAMETER LIMITS Outside Diameter Outside Diameter Qualified, in. (mm) Of Test Coupon, in. (mm) Min. Max. Less than 1 (25) Size welded Unlimited 1 (25) to 27⁄8 (73) 1 (25) Unlimited Over 27⁄8 (73) 27⁄8 (73) Unlimited GENERAL NOTES: (a) Type and number of tests required shall be in accordance with QW-452.1. (b) 27⁄8 in. (73 mm) O.D. Is the equivalent of NPS 21⁄2 (DN 65). Here By, P.BalajiRajan, Inspection Engineer, Velosi Certification LLC, P.O 3408 Doha-Qatar. Mobile- Qatar +97433120091, India +919842659329. -------Original Message------- From: Larry Date: 10/27/2010 11:22:50 AM Subject: [MW:7839] Welder Performance Qualification ASME IX Hi There, We have qualified a welder on an ASME IX WPS with the following: Position: 6G Size: 100NB Specs: A333- WPL6 (P1, G1) Process: GMAW/FCAW (F-No.: 6 electrode) As per QW-423.1 and QW-433, will the welder be qualified to weld the following for production? Position: as required Size: All practical diameter and plate Specs: A106B (P1, G1), SA 312-316L (P8, G1) Process: GTAW (F-No.: 6 electrode) Thank you in advance. Cheers, Larry |
Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
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