Tig welding Carbon 5" steel pipe root

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Hi, I would apreciate your comments on the root pass. It's a 5" carbon steel pipe, 6mm thick, in the 6G position. The picture isn't very clear, but it was the best i could take with my phone.Thanks guys Attached Images
Reply:Having trouble telling what I'm looking at!SA-250DLincoln Pro-MIG 140 w/spoolgunVictor Journeyman O/A outfitWP-26, WP-17, WP-9 TIG torches run off my SA-250Metabo grinders and all the other stuff...
Reply:Did you get complete fusion on the root?  It looks like it didn't fuse all the way, either that or thats just the little stuff I see when I MIG.  Like black shiny glass beads in the weld.MarkI haven't always been a nurse........Craftsman 12"x36" LatheEnco G-30B MillHobart Handler 175Lincoln WeldandPower 225 AC/DC G-7 CV/CCAdd a Foot Pedal to a Harbor Freight Chicago Electric 165A DC TIG PapaLion's Gate Build
Reply:It's completely fused, the brown in the weld is the oxide form. The view perspective is top down on the pipe. The bottom is just the system to hold pipes from several sizes.
Reply:looks good to me !! what setting did you use?  gap, amp, wire size, ect...?
Reply:5" pipe, 4mm root gap (about 5/32" i think), 2.4mm (3/32) rod and +/- 95 amps
Reply:Thats how I thought it was being shown but, I wanted to be sure before I said anything.  The root looks good, only it looks like it's a little heavy.  Sometimes you can end up with too much reinforcement when you run a wider gap and have to fill more.  Other than that it looks good, no LOF and the tacks tied in good.SA-250DLincoln Pro-MIG 140 w/spoolgunVictor Journeyman O/A outfitWP-26, WP-17, WP-9 TIG torches run off my SA-250Metabo grinders and all the other stuff...
Reply:What do you mean by LOF? I don't know that expression.Thanks.
Reply:Lack of fusion!I'm sorry, english isn't my natural language!
Reply:Looks good!Haha!   His natural language is 'Accronysmic', from the land of Cybertype.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:i know were talking tig here. but im down in miami at aws this week at a seminar and they have lincoln esab and miller here and they all brought their newest and best equipment to show off and i got to run some pipe today on this modified short circuiting transfer. lincoln calls is tss or stt i cant remember but this is the way to weld pipe! you do the root downhill and everything else pulsed or flux core as the balance. ive heard of it never tried it till this morning though. it is so freakin easy and beautiful welding. ever get the chance try this out. its whats going on out there from what they were telling us.
Reply:It's called STT, big red have had it for a fair while now, you could teach an 8 year old to run it in about 10 minutes and pretty much have it up to code.   Thing's like this are very dangerous to the trade if used properly. And yes I've seen it happen with my own eye's.nbarreiros:  Your weld is looking good.I'd rather be hunting........USE ENOUGH HEAT.......Drifting around Aussie welding more pipe up, for something different.....wanting to get home.
Reply:Are you burning a key hole when you weld. You have consistancy but it doesnt look like you have enough pen. Most of our weld specs are 1/16 1/8 root on the inside. Are you waliking the cup or free handing. I walk the cup and if you learn to do it (its a pain in the ***) it really helps with the weld on both sides of the pipe.
Reply:its really hard to tell though. if you have a 1/16 or 1/8 in ch max inside your gravy. Always check your root when you stop to grind tacs (some do some dont). as long as you have burned both sides of the bevel edge you will be fine. thats where burning your key hole comes in
Reply:Originally Posted by jroyster06Are you burning a key hole when you weld. You have consistancy but it doesnt look like you have enough pen. Most of our weld specs are 1/16 1/8 root on the inside. Are you waliking the cup or free handing. I walk the cup and if you learn to do it (its a pain in the ***) it really helps with the weld on both sides of the pipe.
Reply:Your right as long as the bevel edges have pen. Most of our process piping is what i was reffering to. We arent a heat shop lol. We do mostly lube oil skids and compressor skids lots of piping. 1/16 is max on ASME code.
Reply:Eh I wouldnt get scared about SST or pulse taking over. LIncoln has had that out for 10+ yrs and it hasnt taken over yet lol. They are swt when they run right...which is rarely. I still can't quite tell whats going on with that pic? is the piece of pipe attached to the holder of a smaller ID than the piece nearer to me? It looks like it steps. maybe my eyes decieve me.
Reply:If we are looking inside the 2 welded pipe coupons at the root weld, it looks like it does not have full penetration. It appears that the pipe is being held in the 45 degree position by an internal holding device?JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720