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Spot Welding Machine for 2G TIG Pipe Practice

Spot Welding Machine for 2G TIG Pipe Practice

Welding Automation for 2G TIG Pipe Practice

laser Welding Machine for 2G TIG Pipe Practice

Welding Automation for 2G TIG Pipe Practice

Welding Automation for 2G TIG Pipe Practice

Platform Spot Welding Machine for 2G TIG Pipe Practice

Platform Spot Welding Machine for 2G TIG Pipe Practice

2G TIG Pipe Practice


Tue, 31 Aug 2021 14:52:28 GMT
Along with the boiler tube practice, which can be seen in my other thread, were also doing some horizontal 2G Practice. TIG all the way, walking the cup. The coupon is 3 sections of 5" Diameter, Sch. 80.Specifics--Miller XMT 350 Scratch StartCompressed Argon @ 15CFH2% Thoriated TungstenER70S 1/8" Filler Wire (Doubled-Up for the cap)Root -85 AmpsFill-115 AmpsCap - 130 Amps
Reply:Coming along nicely my friend! the only thing you lack is more hood time. Your going to be a fine welder sooner enough! only thing i can point out is maybe try and clean the inside of your pipe better for the root. I usually either sandblast or take a die grinder to clean up my edges inside
Reply:I do grind em out with a die grinder, usually a half inch on each pipe. The root pics are post cap so theyve had plenty of heat put to em at 130 Amps. It runs well at that mark but does a number on the root penetration. Can that be improved with faster travel speed?
Reply:Where do you find such large pipe to practice on?Torchmate 2x2 CNC with Flashcut CNC controlsHypertherm Powermax45 Esab ET220i Razorweld 195 MigRazorweld 200ac/dc TigTormach 770, Tormach xstechRazorweld, Vipercut/Vipermig, SSC Foot Pedal Dealer
Reply:I'm a student at a technical school welding program.
Reply:Get in the habit of keeping a file close by. File those two million arc strikes.Those will get you your last check on some jobs.
Reply:Originally Posted by FowlMouthThe root pics are post cap so theyve had plenty of heat put to em at 130 Amps. It runs well at that mark but does a number on the root penetration. Can that be improved with faster travel speed?
Reply:Basically, yes. Overall consistency of the root is fine, walls are broken down and properly fused. But the root certainly sucked back a noticeable amount. It had greater penetration before I filled and capped it.
Reply:Fowl mouth-To remedy suckback you are correct, you must add more filler and increase travel speed. Kind of like water taking the path of least resistance. You can use your filler as a means of cooling your puddle. But i must say ive never heard of this happening on the cap, rather the hot/filler pass
Reply2G TIG Pipe Practiceid you wait until the pipe was cool to the touch before capping?  If yes, then I would say you are running your cap too hot and/or too slow because you are remelting the entire weld.Going from 85 amps to 115 amps on the 2nd pass seems like may be the problem instead of your cap.  Did you check the affect on the root after the 2nd pass?Dave J.Last edited by MinnesotaDave; 06-13-2013 at 09:09 AM.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:it would be my opinion that you would need a TON of heat to effect the root on a cap. OR an incredibly slow travel speed to force that much heat into the pipe. 130-140 is what i run for tig caps, keep in mind i am not walking the cup though, not sure if that makes a difference though?
Reply:I supposed I Kay have miss "spoke" earlier. That first pic of the root was taken after the cap was finished, but I believe the effect on the root was caused during the filler pass. I have some pics of the root pre and post filler. Lemme dig em up here...
Reply:Root Pass @ 85 AmpsSame Root, different angle.Here is the root after the filler has been run. Notice how flat the root penetration becomes. This is on the bottom side 2G position, so I was out of position and trying new techniques. So my travel speed was less than ideal. The fill pass was run @ 115 amps.And now the good....here today's 2nd Cap ran @ 130 amps.
Reply:coming along nicely my friend, excellent root in the first picture. All your experiencing is suck back, try and spend more time on the high side of the bevel and as fast as you can across the root opening area. OR you can try going slower with lower amperage from 6:00 to 4:00 and 6:00 to 8:00 stop and then boost up your amps. Caps are coming along very nice
Reply:I still think it's a simple issue.  Going from 85amps root to 115 amps on the 2nd pass is too big a jump.  You are re-melting your root instead of adding to it.What do you pro pipe guys think?Dave J.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:I agree with Dave, when I do tig, I put my root and hot pass in at the same amps. Maybe a 5 amp bump on the hot, not 30, that's why you're getting suck back..  I never heard of getting suck back when putting in the cap. When I do the cap on tig, I don't usually go hotter either. I wait until it's cool to touch, and then cap. Usually two passes..
Reply:So a hot pass @ 90? Guess ill give it a go. In my experience however, fill passes don't seem to go as smoothly at anything below 110A. Especially if ill be running 5/32 filler. I could see 100A using 1/8 but anything larger certainly requires more heat...?Ideally, using 5/32 filler, would 115 Amps be sufficient for a Fill pass after a 90A hot pass?
Reply:Originally Posted by FowlMouthSo a hot pass @ 90? Guess ill give it a go. In my experience however, fill passes don't seem to go as smoothly at anything below 110A. Especially if ill be running 5/32 filler. I could see 100A using 1/8 but anything larger certainly requires more heat...?Ideally, using 5/32 filler, would 115 Amps be sufficient for a Fill pass after a 90A hot pass?
Reply:As of right now all previous welds are done with 1/8" wire. But this is practice for work and as I understand it, expectations are 1/8" gap, 1/8 wire for root and 5/32 for fill/cap. I would be practicing with the 5/32 wire but my class has expened is inventory and funding as we are within a week of ending.
Reply:Originally Posted by FowlMouthAs of right now all previous welds are done with 1/8" wire. But this is practice for work and as I understand it, expectations are 1/8" gap, 1/8 wire for root and 5/32 for fill/cap. I would be practicing with the 5/32 wire but my class has expened is inventory and funding as we are within a week of ending.
Reply:2g?...5g? Attached Images
Reply:Indeed. 5G. Thanks for the clarification.

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