| Dear Dr.Paulose John, As per your statement in SEC IX QW 301.2 and API 1104 para 6.2.1 it has been not mentioned regarding the minimum number of welder to be qualified by one WPS QW-301.2 Qualification Tests. Each manufacturer orContractor shall qualify each welder or welding operator For each welding process to be used in production welding. The performance qualification test shall be welded in accordance With qualified Welding Procedure Specifications (WPS), 6.2.1 General (API 1104) For single qualification, a welder shall make a test weld Using a qualified procedure to join pipe nipples or segments Of pipe nipples. The welder shall make a butt weld in either The rolled or the fixed position. When the welder is qualifying In the fixed position, the axis of the pipe shall be in the horizontal Plane, in the vertical plane, or inclined from the horizontal Plane at an angle of not more than 45°. A welder making a single-qualification test for branch connections, Fillet welds, or other similar configurations shall follow The specific procedure specification. Sir please clarify. Here By, P.BalajiRajan, Inspection Engineer, Velosi Certification LLC, P.O 3408 Doha-Qatar. -------Original Message------- Minimum number of welders to be qualified by one WPS is - One welder. The welder who performs the PQR coupen welding is automatically becomes qualified. Please refer 2nd para of QW 301.2 of Section IX:2010 and para 621 of API 1104:2007. Regards, Dr. Paulose John QA/QC Manager, Unisis Engineering, Saudi Arabia . On Sat, 30 Oct 2010 14:15:07 , No ID Specified wrote
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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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