Making up angles getting distortion

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I've had  a need to make up  some right angle pieces lately for different projects.An issue I've encountered is that  even though I clamped the parts to be TIG welded to a known good square  when I take 'em off they are no any thing like square necessitating me taking a hammer to them to get them to conform to my needs Is there some  massively noob kind of  thing that is guaranteeing the parts  distort?  The distortion is toward the side that is welded.  SO If I weld the outer corner the parts tend to open up.  If I weld the inside they close up.Hey~!! It's a hobby. It's not supposed to make sense~!!
Reply:Weld out side first, then inside. Or weld inside only, but leave the parts at less than 90 so that when welded they pull square. Stainless is a huge pain in this regard.Does some one have the link to the old Lincoln "Mr.shrink" video?Sent from my SGH-T989 using Tapatalk
Reply:Here you go Raul - it's an old video but watch it more than once Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Hot metal cools, when it does it shrinks. Even Jody can't change that. You can outsmart it. IE a broken bucket lip on a loader, if the crack is 1/4 the depth of the floor of the bucket, you simply weld the crack, you better have some very ductile weld metal. Once welded, everything red hot is going to shrink, probably breaking. If you preheat first, giving most heat behind the cracked portion, you expand the width of the crack. this leaves room for a wider weld, so when everything cools and shrinks including the repair it returns to original size. when welding a corner joint you can restrain it so it bends itself rather than move out of shape, or predict how much it will move, weld it that much out of square. You'll note it curves lengthwise also as the seam shrinks to less length than the metal. Restraint, or preheat will help.
Reply:Originally Posted by MinnesotaDaveHere you go
Reply:That was a really cool video. Educational. Be cool if we can compile video links of things like this and then post a sticky or something to them.HH140---------------------------https://www.facebook.com/brandon.pike.9
Reply:Weldingtipsandtricks.com has some vids as well about it.  Jodi welds a post to a plate and intentionally leaves it 1/8" out of square.  After the weld it's perfect.TA Arcmaster 300CM3XMT 304S22P12 suitcase feederX-Treme 12VSOptima pulserTA161SMaxstar 150STLHypertherm PM45OP setupStihl 020AVP, 039, 066 Magnum
Reply:Lots of great advice.  Thanks guys.Hey~!! It's a hobby. It's not supposed to make sense~!!
Reply:Many times I have used a level to tack pieces out of level and if you weld opposite the out of level it will pull itself level....then tack the other side and you should be goodMiller Syncrowave 210 w/CK FlexLoc 150  3/6/14ESAB PCM 1125 Plasma CutterAtlas 12x36 LatheACER 9x42 3hp millHarig 612 Surface GrinderDRINK Machine              welding&fabrication