More tig work

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I was approached last week to do some welding.  He left me ONE to do and give him a price.  Its a heat exchanger that goes on the first stage of an air compressor in a locomotive.   I can weld them any way I want as long as they are air tight.  They carry about 35 psi.  I tigged the first one and it took me 75 minutes.  I told him I could do them in an hour.  He liked the welds and sent me 22 more.  He said his guy did them, they pressure tested and marked the leaks. They then fixed the leaks.  I told him I want NO leaks the first time.The second pic is the hardest part.  I could not mig this and guarantee no leaks.Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Most of it is an outside corner.  I tried to fuse one, but like it better with filler. Here is the 10" run on one of the first ones.Then I said SCREW the DIMES and just weld.   The torch only goes forward in a steady uniform motion.  I just keep feeding filler the same way.  220 amps full throttle.Real world weldin.  When I grow up I want to be a tig weldor.
Reply:Here is an outside cornerTalk about seat time!   It has already improved my skill.David Last edited by David R; 08-23-2007 at 11:33 PM.Real world weldin.  When I grow up I want to be a tig weldor.
Reply:And the toys (tools)I did the 5th one today in 35 minutes.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Excalent work David R.Great to see your work brought you such quick jobs, and alot of them!Miller Thunderbolt 225Millermatic 130 XPLincoln HD 100 Forney C-5bt Arc welderPlasma Cutter Gianteach Cut40ACent Machinery Bandsaw Cent Machinery 16Speed Drill PressChicago Electric 130amp tig/90 ArcHobart 190 Mig spoolgun ready
Reply:Originally Posted by David RThen I said SCREW the DIMES and just weld.
Reply:Well.... 35 PSI is not much... a MIG stich weld in my opinion would be air tight  but that´s just me, never tried any of my welds...Nice TIG welds and its great that you´re improving...and it seems like it was a pretty fun Job...I bet you´re liking that machine!My Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:Maybe .030 wire, 92/8 gas and a FOOT PEDAL. Now I have to try it. DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:That comment "screw the dimes" reminds me of a veteran pipe welder that worked on the last job I was on.  He had been TIG welding for probably as long as TIG welding has been around and had seen and done it all.  When I first saw his welds I thought he was inexperienced, and sloppy.  But then he "showed the dimes" and my jaw dropped.  He had the skills to make it look pretty, but it wasn't practical on this job since the pipes were being buried in concrete and would never be seen.  As long as they were x-ray quality welds, it didn't matter how pretty they are.Nice job!  You get all the good contracts...  P.S. we use wire all daylong for waterproof welds under pressure.  We run 6010 first then dual-shield over it.  And that has to keep water out of a 300' long steel boat that weighs more than I even want to guess.  I can't even imagine the water pressure exerted on the welds with that much water being displaced.Last edited by WelderBoy; 08-24-2007 at 04:12 PM.
Reply:This is piece work.  I think in inche$ of weld per minute, what ever process works the best.   Its faster to just feed the torch and wire in.  DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Welderboy,The water pressure exerted on the exterior of a hull open to the air above is just dependent on the depth of the hull below the surface of the water.  At 33.9 ft deep, the water pressure is one atmosphere or 14.7 psi.David R,Yeah seat time!  You already cut the process time per unit in half!  Burn it in hot and run fast in the straights, ease off on the corners.Who has to chase the threaded holes (your pics #3 and 4, in your second post in this thread) that have a little weld filler encroaching into the chamfers?  And what are those threaded holes for and will the inserted fasteners still work with the (needed) weld fillet there?
Reply:Originally Posted by MoonRiseWelderboy,The water pressure exerted on the exterior of a hull open to the air above is just dependent on the depth of the hull below the surface of the water.  At 33.9 ft deep, the water pressure is one atmosphere or 14.7 psi.
Reply:Great looking welds! If you or lets say someone else, Mig'd this job, would it hold up to par with the tig that you have done?
Reply:Originally Posted by tanglediverActually at that depth you are at two atmosphere's. One atmosphere at the surface and another atmosphere each additional 33.~'29.4 psi. Given the surface area of the hull, that total pressure is in the mega tons or something.
Reply:Glad you got the job Dave!Looks good.Me!
Reply:looks really good. i like the torch holder idea. i must make one when i get my tig torchhttp://datingsidorsingel.com/
Reply:Good choice to say "screw the dimes". Problem with these things isn't just getting it airtight in the first place, but KEEPING it airtight in service. They see a lot of vibration under load, and constant load cycling. The smoother, the better, in terms of reducing risk of cracking. Also, if dye pen tested or x-rayed, smooth is better.. less risk of showing a 'flaw' that isn't really there between the dimes.Real nice looking job. That point in the second pic should get the designer a dope slap. Not a good idea to carry a weld between planes like that, both from the awkwardness to weld it, and from fatigue issues.
Reply:Originally Posted by enlpckThat point in the second pic should get the designer a dope slap. Not a good idea to carry a weld between planes like that, both from the awkwardness to weld it, and from fatigue issues.
Reply:Originally Posted by WelderBoyAnd that has to keep water out of a 300' long steel boat that weighs more than I even want to guess.  I can't even imagine the water pressure exerted on the welds with that much water being displaced.
Reply:Originally Posted by Alan NIf the hull draws 20 ft of water the pressure on the lowest point is only 10 PSI.
Reply:Originally Posted by tanglediverActually at that depth you are at two atmosphere's. One atmosphere at the surface and another atmosphere each additional 33.~'29.4 psi. Given the surface area of the hull, that total pressure is in the mega tons or something.
Reply:David Great Work, good job being more efficent. Originally Posted by Alan NIf the hull draws 20 ft of water the pressure on the lowest point is only 10 PSI.
Reply:H2oboy,Actually a foot head of seawater (where most ships float) is .445 PSI.Water pure=62.4# per cu. ft.Sea Water=64.08# per cu. ft.Just keeping you on your toes. LaterSyncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:as long as the bilge (?) pump is working ........................shut up and fish!! lolG3
Reply:Another nice job Dave, seat time is what makes us better than we are.Disclaimer; "I am just an a$$hole welder, don't take it personally ."Originally Posted by G3farms  as long as the bilge (?) pump is working ........................shut up and fish!! lolG3
Reply:Originally Posted by SundownIIIH2oboy,Actually a foot head of seawater (where most ships float) is .445 PSI.Water pure=62.4# per cu. ft.Sea Water=64.08# per cu. ft.Just keeping you on your toes. Later
Reply:David very nice work. Now i really want to get a Tig machine. I used it once and now I think Im going through welder's withdraw :/
Reply:nice work Dave and great job. hope it all works out for the best when your done.Miller DVI2Lincoln Precision Tig 225Thermodynamics Cutmaster 38Everything else needed.
Reply:Then I said SCREW the DIMES and just weld.
Reply:It was about maximizing the profit level (got it down to 35 min). Mig woulda slowed him down, deposition rate and all that, plus you can put more heat in with a big tig torch.edit, they coulda been some display pieces though !!Anything worth doing is worth doing RIGHT
Reply:I bought some .030 wire and had AG8.  I migged 3 or 4 of them in about an hour.  Didn't like it. I don't think they will leak but the tigged ones look nicer.  I tigged the rest.  I have pics of them too.  I will post.   "tig work part II"This thread got lost at sea.  David Real world weldin.  When I grow up I want to be a tig weldor.
Reply:I don't think you could have gotten the penetration you needed on a couple of those corners...those things are going to be subjected to some serious vibration aren't they ?Anything worth doing is worth doing RIGHT
Reply:Originally Posted by David RI bought some .030 wire and had AG8.  I migged 3 or 4 of them in about an hour.  Didn't like it. I don't think they will leak but the tigged ones look nicer.  I tigged the rest.  I have pics of them too.  I will post.   "tig work part II"This thread got lost at sea.  David