I am working to ASME IX and have done a procedure to weld cunifer P34 socket welds using a purge but the client has asked for me to do a test without a purge. When I read ASME IX I think that the purge by QW256 GTAW that it is an essential gas but when you read QW 408 I am confused if it is QW408.5 OR .9 OR .10 Which one is relevant and is it an essential variable or not. ?????????????????
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