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Warpage and straightening.
Posted: Tue Oct 22, 2013 5:41 pm
by SBblacksmith
I know Jody has touched on the subject of flame straightening/tig torch straightening, but I am curious for a little more in depth video on the subject. Like flame straightening box tube (thin and thick), solid stock, sheet ect.
The reason I ask for this topic is because warpage seems to be the bane of my existence as a welder. I was just wondering if you had any good tricks up your sleeve.
-Kyle
Re: Warpage and straightening.
Posted: Wed Oct 23, 2013 8:34 am
by Mike
Welcome to the forum Kyle.
As for warpage ??? be more specific in your question and someone will answer.
Re: Warpage and straightening.
Posted: Fri Oct 25, 2013 2:38 am
by SBblacksmith
Well, here are some examples of warpage that I have had. One was a stainless steel railing, 1x2x.083 cap rail with 2x2x.083 posts. All 304, and where the posts met that cap rail, it did't matter how much clamping I did, the cap rail still warped and bowed. I was using tig for this job. Second was a job at the shop, where a new guy just went for it and welded up a door jam, 2x4x.250. All the spots where the 6 inch hinges were welded and in the corners causes a sever amount of bowing. I tried to flame straighten it along with jumping up and down on it between two cinder blocks. I should say that our shop is mainly ornamental fabrication, a lot of railings, doors, gates, firescreens, business signs ect. I was just wondering what kind of tricks for flame straightening box tube one might use, and same goes for thick stuff as well.
Re: Warpage and straightening.
Posted: Fri Oct 25, 2013 6:24 am
by weldin mike 27
Hey,
one weapon you can use in your way against distortion is, pre setting. Once you think you know which something will move with heat from welding , bend it back the other way past the flat stage, by blocking your part in the middle and clamping each end. After welding and cooling , when you release the clamps, it will return to flatish.
Mick
Re: Warpage and straightening.
Posted: Fri Oct 25, 2013 11:24 pm
by Otto Nobedder
Mick's on it!
I weld ss piping, often schd. 5, and "draw" is always on issue. I have to take shinkage in to account with every weld I do.
I pre-set welds with shrinkage in mind. As an example, every sch. 10 pipe weld will shrink 1/32". A sch. 10 90*ell will shrink that same 1/32 inside and out, meaning I have to fit it at 92*-93* if I want it to be 90* when it's done.
Steve S