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AWS D18.1:1999

Specification for Welding of Austenitic Stainless Steel Tube and Pipe Systems in Sanitary (Hygienic) Applications
standard by American Welding Society, 04/14/1999

AWS QC20:2011

Specification for AWS Certification of Resistance Welding Personnel
standard by American Welding Society, 01/01/2011

AWS PRGQA

THE PRACTICAL REFERENCE GUIDE FOR HIGH QUALITY FUSION WELDING OF ALUMINUM
Handbook / Manual / Guide by American Welding Society, 2001