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GMAW/MIG is often used on thick metal (FCAW as well but its more limited to structural stuff). We are welding around 50 mm thick joints with GMAW that are phased array ultrasonic tested. People like SMAW/stick for low temp qualities and lower heat input. You get into stuff about the size of the rod or wire in relation to the puddle too.
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Aug 27, 2015 02:17
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| # ¿ May 19, 2024 23:43 |
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charliemonster42 posted:Would like to know more about this. Sounds much more useful than X-ray testing. We ran into some serious delays on a project due to the x-ray technicians not being diligent in their testing process and waiting until we'd welded both sides of the weld to take any shots. Then they found shadows and they might have been in one side or the other of the welds or it might have been in the fit up and there's just no way to tell so lets just take grinders to it and redo until they go away but now they're moving and there's new ones over here that weren't there before and we need to fix those, too. That sounds pretty iffy but we don't get anything shot or scanned until its done. Did they let your company look at the film? What is the application? I.e. ASME vessels The details of how phased array is done are online but the catch is it does see more on thicker sections than cobalt source radiography. This can make it more difficult to pass welds and makes things like ckeaning between passes all the more critical.
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Aug 27, 2015 15:22
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Keep in mind if you're using thoriated tungsten it is (maybe slightly I dont know actual levels) radioactive and you should use proper ppe...
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Aug 28, 2015 03:55
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I can only see it as giving you more flexibility, but I don't do a lot of work related to that thin of metal. Can you adjust voltage separately or only heat?
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Sep 12, 2015 02:54
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Some info in this article: http://www.azom.com/article.aspx?ArticleID=969 Looks like you're correct on the 309 filler but you also need to preheat. If it's on a flange I would definitely be concerned with distortion. What is the connection like?
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Sep 12, 2015 15:03
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| # ¿ May 19, 2024 23:43 |
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the spyder posted:Warping mainly. This sheetmetal easily warps and it's no fun having to fix a wavy panel because you ran too hot of a bead. This, but mainly cost if you're selling what you're welding.
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Dec 9, 2015 07:33
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