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Spinoff: Fab shop welder qualifications
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<blockquote data-quote="yankster" data-source="post: 500285" data-attributes="member: 4171"><p>To properly qualify a welder to weld a specific material you first have to qualify a welding procedure based on a specific code or standard and prove that a certain filler material, amperage, voltage, wire feed speed and travel speed will provide a weld that is equal to or stronger than the base metal. Procedure qualification can get very expensive and time consuming if you using a lab to verify results and paying an expensive welder to make up these coupons. All procedure qualifications require destructive testing to verify results, which mean tensile pulls, charpy v-notch testing, etc. </p><p> And once a welder is qualified to weld 1.5" 0.120" wt. tubing to another identical piece, he wouldn't necessarily be qualified to weld plate gussets to the same tubing or another plate. Therefore you would have to qualify another procedure and start all over. In addition, a standard would have to be created and followed to requalify each welder on every procedure on a regular basis; most companies requalify with non-destructive means (x-ray, radiograph, etc.) every six months and then will make the welder destructively test every year. Then if he wants to break out the TIG and weld aluminum or steel you have to start the process all over again. 6061 would be one procedure, 5052 would be another, each stainless grade would each require a procedure, and every type of carbon steel. It gets very complicated. This is what I do 11 hours a day, six days a week.</p></blockquote><p></p>
[QUOTE="yankster, post: 500285, member: 4171"] To properly qualify a welder to weld a specific material you first have to qualify a welding procedure based on a specific code or standard and prove that a certain filler material, amperage, voltage, wire feed speed and travel speed will provide a weld that is equal to or stronger than the base metal. Procedure qualification can get very expensive and time consuming if you using a lab to verify results and paying an expensive welder to make up these coupons. All procedure qualifications require destructive testing to verify results, which mean tensile pulls, charpy v-notch testing, etc. And once a welder is qualified to weld 1.5" 0.120" wt. tubing to another identical piece, he wouldn't necessarily be qualified to weld plate gussets to the same tubing or another plate. Therefore you would have to qualify another procedure and start all over. In addition, a standard would have to be created and followed to requalify each welder on every procedure on a regular basis; most companies requalify with non-destructive means (x-ray, radiograph, etc.) every six months and then will make the welder destructively test every year. Then if he wants to break out the TIG and weld aluminum or steel you have to start the process all over again. 6061 would be one procedure, 5052 would be another, each stainless grade would each require a procedure, and every type of carbon steel. It gets very complicated. This is what I do 11 hours a day, six days a week. [/QUOTE]
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