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So I saw this today and thought I'd ask about it. I was in a shop and saw a guy weld a 1/4" x 3" x 20' plate to a 4" x 3" x 20' angle along the 3" leg of the angle to create a channel. The thing curled up like banana! The shop foreman was pissed to say the least. Anyway , was wondering about the proper procedure so as to minimize the curl. The guy at the shop tacked it every 12" or so on both side and then just filled in between the tacks starting at one end and working to the other. The foreman wanted him to alternate filling in from end to end working towards the middle. So what is the proper way to do it?GizzmoSyncrowave 250 CK aircooled tig
Reply:Back step your welds, and skip around a lot. When all else fails, break out the torch and a bucket of water. Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:First of all proper clamping is critical on things you don't want to warp. Others will have the answers but i would think skipping a few feet at a time would help and allowing time for cool down since that's when the warp-page will occur. I say patience is a virtue here.Fireman BillHH 210 MVPMM 211 Spoolmate 100Lotas LTP5000D PlasmaOxy/Accet (Victor)Wards AC/DC buzz box30 ton old hyd pressA few brand name toolsA bunch of cheap toolsA wife to worry me and4 dogs to supervise me
Reply:That would be a cluster-f@@@ no matter how you did it. Altrnating middle- end -middle would help a lot but with all the welding on one side its hard to balance out the effects from the heat. What the guy who welded it was probably the most effective way of warping it. It could probably be heat straightened but it probably isn't worth the effort.Miller xmt304, Miller S22 p12, Miier Maxstar SD, Miller 252 w 30A, Miller super32p12, Lincoln Ranger 9, Thermal Arc 181I with spoolgun, Hypertherm 10000 ,Smith torches. Esab 161lts miniarc.
Reply:Well, guess I'm not the only one who did that.When I first started, about '95, I welded a couple two footers cause I needed an angle.Couple tacks, then welded all the way. It twisted like a screw about 1/8 turn went in the scrap Edit: just re-read it, he ignored the forman?? Does he still have a job?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:Originally Posted by MinnesotaDaveWell, guess I'm not the only one who did that.When I first started, about '95, I welded a couple two footers cause I needed an angle.Couple tacks, then welded all the way. It twisted like a screw about 1/8 turn went in the scrap
Reply:Originally Posted by M J DThat's not a F up ,that's art.
Reply:Originally Posted by minnesotadavewhen i first started, about '95,
Reply:Originally Posted by CEPwow! 95?
Reply:Just funning you Dave.Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Originally Posted by CEPJust funning you Dave.
Reply:Well that's true for sure! Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:In a case like this, another thing you can do is pre-bend the material before welding. Or after every weld peen that weld. On thick material I've used a rivet buster with a flat gad to beat the dog sh!t out of welds.Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:I caint even remember when i was 45The main thing is not to panic or get excited Bobcat 250, X-Treme 12VS, MM211Meltabo, Milwaukee,Porter Cable,Dewalt,MakitaVictor O/A, Ingersoll-RandEvolution Rage2, 40 amp PlasmaLincoln 225 AC/DC
Reply:Attachment 566891 Originally Posted by MinnesotaDaveJust figured you were jealous of my youthful enthusiasm
Reply:Originally Posted by DSWAttachment 566891Well it certainly wasn't your good looks....
Reply:Originally Posted by MinnesotaDaveMaybe he should tell his shop Forman that
Reply:Hello Gizzmo, take into account all of the responses that others have given here, then apply some basic physics and think about the context of those physics when considering all of the responses. A general rule of thumb: when something is heated it will expand first and then shrink slightly more than it expanded as it cools(this is why the banana effect). Another, if there are internal stresses present in the materials from the manufacturing/milling operations involved in their manufacture heat will sometimes result in a release of stresses/tension causing some unforeseeable results that don't follow the expansion/contraction theory. Shimming or back-to-back orientation of like parts with shims and clamping the ends together will "sometimes" help with distortion issues, however, this often requires experimentation to "get it right". Another consideration follows the use of a lot of tacks and a weld-out progression similar to the way that you would torque a head on an engine. These are just a few more items for your consideration. Best regards, Allanaevald
Reply:Aw Hell, if you heat it, it WILL BEND. Give all the advice you wanna give, but it WILL BEND"Any day above ground is a good day"http://www.farmersamm.com/
Reply:Originally Posted by MinnesotaDaveHmmm, maybe some clarification...in 1995 after getting out of the Air Force I'm one of the young ones here - only 43 Hey, i just looked back - I did use an apostrophe!
Reply:Originally Posted by Stick-manI'm 43, too!:drink up: And thanks for referring to us as young ones!!!I did a little welding in college, but I didn't really start until around '96 or '97.
Reply:If the Foreman bitches then let him have a go at it. That is one of those jobs destined for failure. Much better to get 2 angles and plug weld through the centers of them, or use standard channel, or have a piece bent up on a press brake.
Reply:Originally Posted by CEPwow! 95?
Reply:Buy the proper channel in the first place :P
Reply:Originally Posted by walkerIf the Foreman bitches then let him have a go at it. That is one of those jobs destined for failure. Much better to get 2 angles and plug weld through the centers of them, or use standard channel, or have a piece bent up on a press brake.Originally Posted by MinnesotaDave"If the women don't find you handsome, they should at least find you handy." Red Green
Reply:Originally Posted by gizzmoSo I saw this today and thought I'd ask about it. I was in a shop and saw a guy weld a 1/4" x 3" x 20' plate to a 4" x 3" x 20' angle along the 3" leg of the angle to create a channel. The thing curled up like banana! The shop foreman was pissed to say the least. Anyway , was wondering about the proper procedure so as to minimize the curl. The guy at the shop tacked it every 12" or so on both side and then just filled in between the tacks starting at one end and working to the other. The foreman wanted him to alternate filling in from end to end working towards the middle. So what is the proper way to do it?Gizzmo
Reply:Originally Posted by ZTFab'95, huh...I was a sophomore in High School in '95.
Reply:Thanks for the responses,all very good. Yes the guy still has a job and is generally a good welder but this one got away from him. The foreman is a GREAT welder and is well capable of doing the job (but that's what we get paid for) . Apparently this was a bit of test on a non-critical part. The foreman said it wouldn't matter and show us a bit of straightening using a torch and water. The man has a great eye and understanding of how to form metal. Anyway I just wanted to pick you brains a bit so when it's my turn I won't be totally ignorant of how to proceed.Thanks again ,GizzmoSyncrowave 250 CK aircooled tig
Reply:Remember gizzmo, back stepping, and skipping around a lot is your friend in a case like this. Attached ImagesDont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400 |
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发表于 2021-8-31 23:24:31