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T-Joint help..

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发表于 2021-9-1 00:10:09 | 显示全部楼层 |阅读模式
Hello all,Don't have any pics yet, but I thought I need some help with this joint type and who better to come to than this group.Tigging mild steel 1/8" thk, 105-115 amps, 3/32 (ER70S2) filler, 15-20CFM on the argon, .06 electrode, 5/16" ID cup, electrode stickout about .130".I'm not having problems with laying a decent bead or butt joint. I'm really having trouble with the t-joint - especially undercutting the vertical piece. I position the torch about 40 degrees off vertical towards me and about 10-20 off vertical to the right (pretty typical of many diagrams I've seen). I start a puddle in the corner and then dab a bit. It looks like the vertical piece is not really flowing into the horizontal piece - but  I keep the torch aimed into the corner, because I know I'm undercutting.Should I be "rotating" the torch occasionally towards the vertical piece? Am I adding too little filler? When I do add filler should I add it right into the corner? Seems strange, but I don't recall having this much trouble -  even with OA. It's tough to see the puddle sometime but I don't want to hang the electrode out too far. Should I be?I'll try and get some pics up - but thought I'd run it by you folks in case I'm missing the boat on my setup.Thanks, Mike
Reply:I leave the tungestion out anywhere from 1/4" to 3/16"Basically where the sharpness starts..Thats how much is "out"You may want to try some 3/32" tungestion..Dont be afraid to "pour on the filler"..And try to aim alittle more to where the "trouble" area is with the torch..Pics would be good so post if you can and we'll take it even further.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Instead of just letting the wire melt into the puddle push the wire in there and fill the puddle._________________Chris
Reply:As someone here told me, its not "dip", but "Stick" the rod in.   Yes, add more filler if you have undercutting.  Torch angle could be part of the problem too.  I set the tungston so it just won't touch a finished bead in a T joint.  Learned all this here, most of the tig stuff from zap.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:thanks for the tips all! I ran out of time yesterday, so I'll get some new samples/pics up soon.I'll try the 3/32" tungsten - with 3/16-1/4" stickout as you suggested zap. Maybe up one cup size? (Currently 5/16" ID)I'll see what kind of mayhem I can produce...Mike
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