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    Welder Qualification

    when a welder is suppose to be qualified using a specific PQR can we use a test coupon within the range of what qualified in the PQR or should we use the same test coupon used in the PQR. For example "if the PQR is qualified for 6" SCH 80 Pipe (which will qualifies for 2-7/8" & above.) at the...

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