| 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 |
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
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