Joint porosity

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I had a joint failure today. It came out with extreme porosity. Lincoln SW 175 100 amps DCEN2% Thoriated 1/16Pure Argon 20 cfh3/16 in. Hot rolled with the mill scale sanded offChecked connections tightThe t-joint was welded and I got the porosity shown. I grabbed a piece of hot rolled using the same sanding disk cleaned the scale and ran the two beads shown. I was not careful with cleaning it as I was just testing the set-up. Beads are not the best but no porosity. Machine set-up same.I welded the next t-joint and got the same porosity. As far as I know the material is just hot-rolled plate cut to size. What am I missing?Timmetalcraft by mooseSoutheast Michiganhttps://www.facebook.com/Metalcraftbymoose  Stupid Hurts!!
Reply:Your skill and knowledge are not up to par, and both of them are colliding.I hate being bi-polar it's awsomeMy Heroes Have Always Been Cowboys
Reply:Are  you cleaning the area of the joint that is in contact with the lower plate? Stuff will chinook out as you weld and cause problems.Sent from my SGH-T989 using Tapatalk
Reply:Originally Posted by weldermikeYour skill and knowledge are not up to par, and both of them are colliding.
Reply:Originally Posted by dcoffmanjrAre  you cleaning the area of the joint that is in contact with the lower plate? Stuff will chinook out as you weld and cause problems.Sent from my SGH-T989 using Tapatalk
Reply:How is the other side of the weld? Just because you cleaned everything real well, when you weld on one side it will push out mill scale and impurities out of the backside esp on the thinner stuff, and needs to be cleaned up again. When you come into problems like this, don't try to plow through them. Drop back and think it out bud, something is wrong. Flip that piece around, and lets have a look at the other side. I hate being bi-polar it's awsomeMy Heroes Have Always Been Cowboys
Reply:I wonder if pre-heating would help? I get a feeling there might be some oil some where.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:You could also be dwelling, and boiled the puddle. With the section you have - just clean it, bust the knobs off the welder and fuse it all the way around (don't worry about undercut, just keep up with it) and you will get an idea of how much power & arc gap you need for that thickness.If you see the puddle moving in a circle - your time might be up...Good luckMatt
Reply:Pressure check the torch and hose by putting a back cap on both sides and letting the argon flow into it. It almost looks like you were welding with c25, I have seen a few people do that.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Check your torch set up. If you have another cap I'd swap it out and see what's what.~Scott~You can see what projects I'm working on on my Facebook page.https://www.facebook.com/pages/Bucke...3595655?ref=hlbucket_of_bolts on Instagram HTP 221 DV
Reply:Originally Posted by tackitLooks like a gas issue to me,  is the nozzle clean and the holes open in the tip holder? Check you your regulator,  make sure it's set at 25 and don't weld in a draft, also hold the torch close to the weld..
Reply:Im by no means an expert, in fact Im still in the teaching myself to tig weld phase, so take this for whatever its worth.The few times I had similar porosity it was either gas flow or oil.  My lathe and my welding area occupy the same table.  The oil incident turned out to be I had laid the rod down in a puddle of oil from my lathe.  I had another where the solenoid was plugged and another where I just had too much gas.  Going on a recommendation from a friend I was running 20cfh thru a #6 cup and it was too much.  I turned the flow down a little, maybe 16-18cfh, and it cleared the problem up.  For a #8 cup though 20cfh seems to work the best for me.I just reread your post though and saw youre running 100amps thru a 1/16" tungsten.  Too many amps maybe?  I had a hole in a weld once and finally figured out that it was a piece of tungsten that had broke off and dropped into the puddle.  Maybe try a 3/32" tungsten and see what happens.
Reply:I am new to TIG welding and I saw the same thing.  I was running argon at 20cfh and turned it down to 10cfh and the problem went away.
Reply:In my TA185 all I ever used was 3/32 tungsten, didnt have a need for anything smaller..I ran at 10cfh with a gas lens, around 15cfh with regular cup and collet..I would also be at about 170 amps and use the pedal.what filler you using, I would guess er70s-6?tackleexperts.comwww.necessityjigs.comhttps://www.facebook.com/groups/mach...dingequipment/
Reply:It's all G.W. Bushes fault. He did this to you. Lack of shielding gas & the presence of oil sure can do that to a bead.  I would start right back at square one. Close the doors too. City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny