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I'm running 110amps DCEN with 3/32 2% ceriated tungsten. I am attempting one inch per 6 seconds but am going maybe a second or two slower. It's a butt weld on 3/16 mild steel at a 45 degree angle going up. No filler, but I have some er70s-2 available.The welds seem ok, preliminary banging with a hammer hasn't broken the metal.The tungsten seems to keep balling on me. I don't know if I'm dipping it, or I need to go up to a larger diameter tungsten. I'm also getting a small amount of flying sparks, might be due to the mill scale.This is my second attempt at tig, so I'm pretty green. Anyone have any tips?Thanks!Click to enlarge:
Reply:Originally Posted by clearchrisI'm running 110amps DCEN with 3/32 2% ceriated tungsten. I am attempting one inch per 6 seconds but am going maybe a second or two slower. It's a butt weld on 3/16 mild steel at a 45 degree angle going up. No filler, but I have some er70s-2 available.The welds seem ok, preliminary banging with a hammer hasn't broken the metal.The tungsten seems to keep balling on me. I don't know if I'm dipping it, or I need to go up to a larger diameter tungsten. I'm also getting a small amount of flying sparks, might be due to the mill scale.This is my second attempt at tig, so I'm pretty green. Anyone have any tips?Thanks!Click to enlarge:
Reply:Turn your gas on, it works better that way. I doubt your tungsten is balling, with welds like that its burning up instead. Big difference.Have we all gone mad?
Reply:JSM11: I am running about 18cfh with an HTP gas lens. I just turned it up to 23 cfh to test and was getting major porosity in the work piece.sn0border88: I hear the gas come on and see the regulator needle twitch when I hit the peddle. I think it's on.Last edited by clearchris; 02-13-2011 at 05:31 PM.Reason: clarifying
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Reply:Then next thing you need to do is grind the scale off the plate, cant TIG weld over stuff like that.Have we all gone mad?
Reply:prop-doctor: 100% argonsn0border88: I was starting to suspect that I needed to grind the scale. Time to get out the angle grinder.Thanks everyone!
Reply:Originally Posted by clearchrisI'm running 110amps DCEN with 3/32 2% ceriated tungsten. I am attempting one inch per 6 seconds but am going maybe a second or two slower. It's a butt weld on 3/16 mild steel at a 45 degree angle going up. No filler, but I have some er70s-2 available.The welds seem ok, preliminary banging with a hammer hasn't broken the metal.The tungsten seems to keep balling on me. I don't know if I'm dipping it, or I need to go up to a larger diameter tungsten. I'm also getting a small amount of flying sparks, might be due to the mill scale.This is my second attempt at tig, so I'm pretty green. Anyone have any tips?Thanks!Click to enlarge:
Reply:if it's hot rolled steel then the scale is jumping on your tungsten. if not you have you hot start set up to high, that is if you are using a dynasty.
Reply:Originally Posted by threedif it's hot rolled steel then the scale is jumping on your tungsten. if not you have you hot start set up to high, that is if you are using a dynasty.
Reply:You say "the weld seems OK". Sorry to be harsh, but I would suggest you shoot the bird that must be roosting above your welding table, what you show in the photo is not a weld.The abuse of the steel in the photo appears to have no inert shielding! The failure to remove the mill scale may account for some of the porosity and severe oxidation, but you also have a major shielding gas problem, either not 100 Argon ( a MIG CO2 mix by mistake?), or a major leak in the gas system, or major wind blowing the shielding away.You can test your shielding by making a small stationary spot weld on clean steel, it should be absolutely shiny silver color if the shielding is pure and you have adequate post flow while the spot cools.Looking forward to seeing some clean welds, thanks for sharing.Last edited by pulser; 02-15-2011 at 02:22 PM.
Reply:I agree on poor shielding. What torch are you using? too much gas flow can cause the same problems as not enough as it ends up being a turbulent flow which will pull in air from around the weld. I would reset your gas flow to 15cfm and maybe switch to a regular gas cup in maybe a #7 size. Try keeping your tungsten stickout to around 3/8 at most and hold a very tight arc to the metal as well
Reply:Here's the best $25 you'll ever spend: http://www.millerwelds.com/resources...d=170555&qty=1Blackbird
Reply:Originally Posted by sn0border88Turn your gas on, it works better that way. I doubt your tungsten is balling, with welds like that its burning up instead. Big difference.
Reply:ironmangq: I have been keeping the tungsten stickout less that 1/8". Any more and I just dip the tungsten.I have been using the standard diamondback torch (wp17) that comes with the miller synchrowave 180 (old model, no numeric display).threed: I didn't know mill scale could jump on the tungsten. It sure does look like there is a buildup of something on the tungsten rather than the tungsten itself melting.pulser: Heheh, if you can imagine, that bird poop is great progress from my first attempt. I'll tighten up the gas connections, clean the metal, and try again. It's a new tank and the tag says argon, and that's what I asked for, so I hope that's not the problem.I'm going to try to make another go at it tonight after work. Thanks!
Reply:Good attitude....Hope to here of better progress.1981 Lincoln SA 200Miller Trailblazer 302gMiller 211 Mig Welder w/ AutosetI'm learning to stick metal together
Reply:You cannot TIG weld over mill scale . PERIOD.When you see all that brown stuff along the weld, the gas pressure is a little too high.Don't use a grinder for cleaning along the weld seam, it is too rough. Use a 60 grit flap wheel and it will leave a much smoother surface. A grinder can leave very deep grooves which is a stress riser.What a good TIG weld should look like on carbon steelWATCH THIS EXCELLENT VIDEO Good luck with your welding ClearChris!!!Last edited by Donald Branscom; 02-16-2011 at 01:44 PM.AWS certified welding inspectorAWS certified welder
Reply:Originally Posted by clearchrisJSM11: I am running about 18cfh with an HTP gas lens. I just turned it up to 23 cfh to test and was getting major porosity in the work piece.
Reply:they say 10 sec post flow for every 100amps.
Reply:Ok, I dipped the steel in a malic acid solution to strip the scale. It worked pretty well. I turned down the gas to 13cfh. My post-flow isn't configurable, I think it's set to 10sec.No sparking and the weld looks completely different.I think I can turn on the pulser at this point to try to reduce my HAZ. What do you think?
Reply:Originally Posted by clearchrisI think I can turn on the pulser at this point to try to reduce my HAZ. What do you think?
Reply:Just my 2 cents....If its balling on its own check your polarity.....If your dipping it get comfortable and make a steady guide...Sounds like you have been dipping it so check your gas leans its probably clogged....Get rid of the ceriated (I only use ceriated on Aluminium, didnt like way it ran on SS and MS), Get some 2% Thoriated....Also I set my gas pressure at the torch with one of these I dont trust guages after all these years....Just my opion....Go Luck....And like snoborder88 stated forget about the bells and whistles till you get the basic...Been weld/Fab for 24years now....Been pulsing everything for last 5 years....Gas Guage checker........http://weldingdirect.com/gasflowchecker.html
Reply:I read your post and looked at the pics and as the guys stated you had several items to address 1. Clean scale from surface with Hot Roll 2. maintain a clean well manicured tungsten and 3. keep it out of the puddle and clean it if you dip......The second pics looked a ton better so your on your way.....Now practice practice practice.......... Miller Dynasty 350Twenty Six HammersThree Crow BarsBig Rock
Reply:Never mind about the pulser at this point learn to weld with "seat time" at your bench.Everything will fall into place after you see what is happening with the puddle and you gain confidence practice practice practice.Did i mention practice practice practice. It is quite rewarding with the learning curve but TIME is what it requires.Vinnie |
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发表于 2021-8-31 23:29:29