TIG Bend Test

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I'm trying to tig up two peices of 1/4" for my certification test.  It's supposed to have a root pass, fill pass, and cover.  I am having trouble getting the root to show on the back.  Does anyone have any tips/tricks as to how I can be successful?Thanks, TroyLincoln 175Monkey Wards 230v.  Stick
Reply:3/32" gap, feather edge. I'm assuming its a butt joint. 80-105 amps 3/32" ER70S2 filler. Post some pictures of what you can do so we know what you need help with.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Originally Posted by HotRodTroyI'm trying to tig up two peices of 1/4" for my certification test.  It's supposed to have a root pass, fill pass, and cover.  I am having trouble getting the root to show on the back.  Does anyone have any tips/tricks as to how I can be successful?Thanks, Troy
Reply:Need more info to help you, but my preference for butt welding is feathered edge, .5mm gap (around 1/48th of an inch) and around 140-150 amps on the root run and hot pass, new, sharp tungsten and around 110 for a good looking cap, and keep the wire in the weld pool at all times, this help's to keep the weld pool from getting to hot and causing undercut on the cap, and stop's the root run from sucking back and underfilling.If your not getting peno on the root run there's only so many things it can be, to cold, travelling to fast, to little gap for your amp's, to much landing (easiest without any landing regardless of how much gap you use), sometimes you can force the weld metal through by pushing the wire into the weld pool, not just welding some off, this can force the weld pool through the root and melt in as long as your travel speed is right.Your set-up, and description of your set up, preferably picture's, would help us help you.
Reply:Its a 60 degree V-groove on mild steel. On the first attempt I had no land with a little penetration.   On the second I had a land with no penetration. I was running @ 145 and my tungsten started to ball.  I dont know if it makes a difference but I'm using a new purple ( multipurpose ) tungsten. I will post a couple of pics tomorrow night when I get to class.  Thanks for the replys so far.
Reply:sounds like your using an AC machine, or electrode positive polarity, you want DC electrode negative for this test, running EN the tungsten won't melt and ball like you describe, or your tungsten is far to small for the job (unlickly, since 145 amps is just penetrating with no landing), 145 amps should be plenty enough for a mild steel root, with any more then 1mm  (.0040) root gap, the weld should be very very difficult at 145 amps.EDIT- also, what size tungsten are you using?  I usually run a 3/32 (2.4mm) at up to 200 amp's, without the tungsten balling, and the balling, and 145 amps not being enough heat to get penetration with no landing tells me, your polarity is ***-about, or your running an AC machine.Last edited by ttoks; 04-16-2014 at 08:17 AM.
Reply:Originally Posted by AKweldshopWhat position??
Reply:For the lay wire technique I like a 3/32” gap, no land, 1/8" filler. And about 95-amps. For dipping I like almost and 1/8” gap no land, 1/8" filler, and about 145-amps. I wait until the puddle forms a C before adding filler. I use 3/32” Ceriated tungsten. Attached ImagesDon’t pay any attention to meI’m just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:personally for all my tig roots on pipe, I use 1/16" land, 5/32" gap and feed from the inside. 3/32" rod - 90 amps
Reply:Originally Posted by Pressure_Welderand feed from the inside.
Reply:From 6 to 3 ish on pipe I like to back feed like Pressure. Once i get up above 3 I bring the filler up in to the bevel. I do a 5/32 gap but use 1/8 filler.
Reply:Here is a good video Jody posted a while back. He is doing 6G position, but talks a lot about the root pass. Helped me when I welded a friends 12 bolt.kidtigger24  They think I’m crazy, but I know better. It is not I who am crazy. It is I who am MAD!
Reply:Originally Posted by Pressure_Welderpersonally for all my tig roots on pipe, I use 1/16" land, 5/32" gap and feed from the inside. 3/32" rod - 90 amps
Reply:Here are my root and crappie fill. I was using a Lincoln Square Wave @ 145 amps and DCEP.   Well according to Tapatalk the administrator has blocked me from posting pictures.Sent from my SPH-L710 using TapatalkLast edited by HotRodTroy; 04-18-2014 at 11:55 PM.Lincoln 175Monkey Wards 230v.  Stick
Reply:Okay had to do a separate post.   Damn newbs.  Sent from my SPH-L710 using TapatalkLincoln 175Monkey Wards 230v.  Stick
Reply:Okay had to do a separate post.   Damn newbs.  Sent from my SPH-L710 using TapatalkSent from my SPH-L710 using TapatalkLincoln 175Monkey Wards 230v.  Stick
Reply:Originally Posted by HotRodTroyHere are my root and crappie fill. I was using a Lincoln Square Wave @ 145 amps and DCEP.
Reply:I give it a shot.  On my fill I was having trouble getting the puddle to tie in on both sides without having to walk it back and forth.Sent from my SPH-L710 using TapatalkLincoln 175Monkey Wards 230v.  Stick
Reply:Originally Posted by AKweldshopThere's your problem!!Should be on DCEN.Try that and see.
Reply:All i can do is laugh, since i did say 14 post's back (post 6) that your polarity is the wrong way around, not reading every post I see?
Reply:Originally Posted by ttoksAll i can do is laugh, since i did say 14 post's back (post 6) that your polarity is the wrong way around, not reading every post I see?
Reply:Thanks for all the help.  I was able to pass my bend test with no cracking or breaking.  I also passed my final.  Which was a pipe sleeve I 1G and 2G then pipe to plate in 1F position. Sent from my SPH-L710 using TapatalkLincoln 175Monkey Wards 230v.  Stick
Reply:Congrats!!You owe us a beer for the tips....~JohnJust a couple welders, big hammers, grinders, and torches.Work will free you.Men in dirty jeans built this country, while men in clean suits have destroyed it. Trump/Carson 2016-2024
Reply:You mean you haven't gotten yours yet?   I'll bet the mail man drank it.   ;-)Sent from my SPH-L710 using TapatalkLincoln 175Monkey Wards 230v.  Stick
Reply:LOL....Congrats again...Take care,~JohnJust a couple welders, big hammers, grinders, and torches.Work will free you.Men in dirty jeans built this country, while men in clean suits have destroyed it. Trump/Carson 2016-2024Thanks. Sent from my SPH-L710 using TapatalkLincoln 175Monkey Wards 230v.  Stick