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27 января 2012 г.
This standard American Welding Society (AWS). 1993. 24p. Supplement F of AWS QC7-93, Standard for AWS Certified Welders, was developed using as references ANSI/ASME B31.3, Chemical Plant and Petroleum Refinery Piping and ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications. American Welding Society makes no assessment of WPS or PQR compliance with either of these standards nor of their usability in production weldi...