AWS coupon warp

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Hi..Been practicing 1G, 2G, & 3G with 1" coupons and I'm getting warpage (weld pull?) and wanted to know what I'm doing wrong...  Here's what I'm running...SMAW 7018 5/32 85-90A DCEP.. Stringers on the fill passes...Could it be the smaller sticks are heating the coupon too much?...  How long should you wait between passes for the coupon to cool?  Or is there something else wrong?...Is coupon warpage acceptable on visual...  I wouldn't think so...   Thanks for your comments.Jeffrey Noob welder Thermal Arc Fabricator 181i w/   - Tweeco SG160 Spool Gun   - SSC C850-0825 pedal
Reply:I think you may have a typo. Did you mean 3/32" 7018 instead of 5/32"? Amps seem WAY too low for 5/32". They'd be low for even 1/8"..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:plate warpage is fine on the aws d1.1 test 3g an over head 4g almost always warpsMiller Xmt 350Lincoln Ln-25Ahp 200xSmith Gas Mixer AR/HTig is my Kung FuThrowing down dimes and weaving aboutInstagram http://instagram.com/[email protected]
Reply:Anything you weld is gonna have warpage to some extent, you can see how much it moves and try tacking it up angled back the opposite way so it'll pull in straight when you get done.
Reply:I believe it's better to use 1/8 rods to fill, and 3/32 to cap if you are given the option. When I took a D1.1 test I had to use 1/8 all the way. As for cooling... you can wait as long as you want on test day. As long as you finish the weld in time. What I normally do is run the root and hot pass, wait 5-10 minutes, run the fill and the first cap bead, wait again, and finish it out.
Reply:Far as heat, back in my testing days. I'd make a soapstone line 1-inch out from the top of the bevel on both sides, when the blue heat line got to that soapstone line I'd take a walk.Don’t pay any attention to meI’m just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Warping test plates may or may not be a big deal.  Depends on who's evaluating them, and what kind of testing is being done.  If you're taking a welder qualification test, with visual inspection and bend straps, some warping isn't a problem.  Same for an X-ray evaluation.  If you're doing a weld procedure qualification test, and they are cutting impact specimens, or transverse tensile bars then warping will be a problem because it will interfere with machining the test pieces.The best countermeasure for this is to tack up your plates with a little angle to them, if permitted to do so.  The distortion from welding will pull the plate back into a  flat/straight alignment. This is OK for practice or quick and dirty testing. The other option is to put the test plate in a fixture that restrains the plates and keeps them from moving, or weld strongbacks to the back side of the plate.  For a typical 3/4" thick AWS test plate, I'll take two pieces of 3/4" plate, each about 4-6" wide and 12" long.  Notch them in the middle of one long side to fit over the root pass or backup bar.  Weld them to the back side of the tacked up test plate, perpendicular to the weld joint, about 1/3 of the way from the top and bottom of the plate.  I attached some sketches of what I'm trying to describe.  Note the fillet welds joining each strongback to the test plate.  The strongbacks are broken off once welding is complete and the plate has cooled to room temperature.  You can notch those fillets with a cut off wheel if the filler metal you're welding with has very high strength or toughness.  Then lay the plate on a bench or the floor and smack the strongbacks with a hammer until they fold over the fillets and break off. Attached ImagesBenson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:Originally Posted by DSWI think you may have a typo. Did you mean 3/32" 7018 instead of 5/32"? Amps seem WAY too low for 5/32". They'd be low for even 1/8".
Reply:Originally Posted by akabadnewsI believe it's better to use 1/8 rods to fill, and 3/32 to cap if you are given the option. When I took a D1.1 test I had to use 1/8 all the way. As for cooling... you can wait as long as you want on test day. As long as you finish the weld in time. What I normally do is run the root and hot pass, wait 5-10 minutes, run the fill and the first cap bead, wait again, and finish it out.
Reply:Warping plates on a structural weld test is common. Nothing to worry about.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720
Reply:Originally Posted by CEPFar as heat, back in my testing days. I'd make a soapstone line 1-inch out from the top of the bevel on both sides, when the blue heat line got to that soapstone line I'd take a walk.