tig.. carbon flange.. sch 40.. technique to prevent warp?

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hiI was just curious on opinionsI was just wondering weld techniques I could try on a flange to pipe butt weld to prevent warping the flange out of squarecan be rolledI'll bolt flange to another flangetigcarbonsch 40anyway.. any opinions or ideas would be great.. ty in advance
Reply:I read your post earlier, but figured that someone else will reply.  Since no one else has replied, I will make a couple of suggestions.     The idea of clamping a flange to the flange being welded is a good strategy.   If the flange was not rigid enough, you could clamp it to 1/2 inch thick plate, or anything which would be very difficult to distort.If you can predict the nature of the distortion, you could potentially compensate for it.   For example, not just clamping to the plate, but adding a shim to counteract the distortion before clamping it.You could potentially correct the distortion after the fact by heating it red hot and then "adjusting" it, perhaps with a hammer, a lever, or a clamp.   That might not be very applicable to flanges, however.  Another strategy would be a series of tack welds.  You could tack the flange in several places before you weld it.  How many tacks are you using now?From what you wrote, I took it that the flange was no longer flat, not that the flange was somehow off a degree or two.I will be interested in seeing the suggestions from people who weld pipe regularly.Last edited by raferguson; 03-22-2015 at 03:49 AM.Sculptures in copper and other metalshttp://www.fergusonsculpture.comSyncrowave 200 Millermatic 211Readywelder spoolgunHypertherm 600 plasma cutterThermal Arc GMS300 Victor OA torchHomemade Blacksmith propane forge