Tig and stainless mig 75ar25he

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Looking to try some different gas looking at 75ar25he any thoughts. Tig and stainless mig. And mild/carbon steel mig but with stainless wire.
Reply:For tig steel/stainless pure argon. For stainless mig a tri mix gas is usually recommended.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Not the right gas for stainless. 75 Ar/25 He is for welding thick copper and aluminum alloys. MIG welding gases for stainless require a small amount (2 - 5%) of CO2 in order to get good wetting and correct bead profile. TIG for steel and stainless uses 100% Argon.For MIG, many folks use what is called "tri-mix" which is 90% He, 7.5% Ar, and 2.5% CO2.97% Argon / 3% CO2 is another common mix for stainless.99% Ar/1% O2 can also be used.JohnLast edited by Silicon-based; 04-28-2014 at 08:15 PM.Reason: ClarityA few weldersA lot of hammersA whole lot of C-clamps
Reply:Let's forget about the mig for a moment. For Tig welding stainless steel the addition of helium to argon increases the available energy to the weld pool making it more fluid. This in turn increases the penetration profile and weld fusion characteristics. Both these features will help reduce defect levels, reducing scrapping rates and rework, both of which are expensive and must be carefully controlled. Welding speeds are also higher than with pure argon and this helps reduce production costs and improve productivity.
Reply:Originally Posted by Austin BennettLet's forget about the mig for a moment. For Tig welding stainless steel the addition of helium to argon increases the available energy to the weld pool making it more fluid. This in turn increases the penetration profile and weld fusion characteristics. Both these features will help reduce defect levels, reducing scrapping rates and rework, both of which are expensive and must be carefully controlled. Welding speeds are also higher than with pure argon and this helps reduce production costs and improve productivity.
Reply:Originally Posted by Austin BennettLet's forget about the mig for a moment. For Tig welding stainless steel the addition of helium to argon increases the available energy to the weld pool making it more fluid. This in turn increases the penetration profile and weld fusion characteristics. Both these features will help reduce defect levels, reducing scrapping rates and rework, both of which are expensive and must be carefully controlled. Welding speeds are also higher than with pure argon and this helps reduce production costs and improve productivity.
Reply:Thank you I was hoping for a reply from someone that has used this mix. I'm just looking to try different things and see what happens. Sent from my iPhone using TapatalkThermal arc 211iCk flex-loc 150 & 130Clamps, saws & grindersHarbor freight 80 amp inverter
Reply:Hey Austin, here is a listing of some different mixes. http://www.linde-gas.com/internet.gl...1217_82204.pdfArgon/Helium is near the end:"VARIGON He30This argon and helium gas mixture is suitable for TIG welding all gradesof stainless steel.The addition of helium to argon increases the available energy to theweld pool making it more fluid. This in turn increases the penetrationprofile and weld fusion characteristics. Both these features will helpreduce defect levels, reducing scrapping rates and rework, both ofwhich are expensive and must be carefully controlled.Welding speeds are also higher than with pure argon and this helpsreduce production costs and improve productivity."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:Only problem with helium is its expensive.Why not mix your own gas and try all of them?old Miller spectrum 625 Lincoln SP-135 T, CO2+0.025 wireMiller model 250 and WP-18V torchCraftsman 100amp AC/DC and WP-17V torchCentury 115-004 HF arc stabilizerHome made 4 transformer spot welderHome made alternator welder
Reply:Yeah this is where I did some of my research. Excuse the plagiarism but copy and paste is just too simple. I have two 80 cf bottles one pure argon and the other 75/25 ar co2. The argon is running on fumes and i thought why not try something different. I've been arc welding and mig welding for years buy just recently jumped into gtaw. I wanted too see what other people have used other than the common shielding gasses. As far as mixing my own this is something I would like to do in future. If I got my hands on a co2 cylinder and a kick a$$ mixing valve combinations would be only limited by my knowledge. Which in most part is why I joined the forum, to learn what the thousands of combined years experience already learned the hard way.
Reply:Mad welder you have a mixing cart details please. Cost where can I buy or make one how much $$$$
Reply:I have flow meters connnected together with the regulator pressures all set the same, all feeding into one line.I have welded quite a bit of stainless with mig mixing my own 2% to 5% CO2 to argon mix. Also welded a lot of steel with everything from traditional C25 mix to C80 mix blending my own gas. Lets say I want real pretty looking steel welds on thicker metal, just set the argon and CO2 regulators for 10cfh.If you want C25, do 15 on the argon reg and 5 on the CO2.Need to do stainless, chances are the regulator isn't graduated to 1cfh so you have to mess with it a little, if your stainless weld is tall and clumpy, add more CO2, if its dirty and porous looking use less CO2.Its deceptively simple, you think it cant be that easy but it is.Last edited by mad welder 4; 04-29-2014 at 10:23 PM.old Miller spectrum 625 Lincoln SP-135 T, CO2+0.025 wireMiller model 250 and WP-18V torchCraftsman 100amp AC/DC and WP-17V torchCentury 115-004 HF arc stabilizerHome made 4 transformer spot welderHome made alternator welder
Reply:2x postLast edited by mad welder 4; 04-29-2014 at 10:21 PM.old Miller spectrum 625 Lincoln SP-135 T, CO2+0.025 wireMiller model 250 and WP-18V torchCraftsman 100amp AC/DC and WP-17V torchCentury 115-004 HF arc stabilizerHome made 4 transformer spot welderHome made alternator welder
Reply:So multiple lines running into a manifold body and one line out to your work ? Sounds simple enough. Do you use back flow preventers. Do you have pics that would help a bunch. Thank youThermal arc 211iCk flex-loc 150 & 130Clamps, saws & grindersHarbor freight 80 amp inverter
Reply:Originally Posted by Austin BennettSo multiple lines running into a manifold body and one line out to your work ? Sounds simple enough. Do you use back flow preventers. Do you have pics that would help a bunch. Thank you
Reply:Turns out that at least my regulatorsmhave check valves built in, I would think most do.old Miller spectrum 625 Lincoln SP-135 T, CO2+0.025 wireMiller model 250 and WP-18V torchCraftsman 100amp AC/DC and WP-17V torchCentury 115-004 HF arc stabilizerHome made 4 transformer spot welderHome made alternator welder
Reply:Cool thanks for the info I might have to start playing with this idea.Thermal arc 211iCk flex-loc 150 & 130Clamps, saws & grindersHarbor freight 80 amp inverter
Reply:Update my not so local lws by my work finally got my 75ar25he bottle in. picking it up tomorrow at the same price as pure argon form air gas. I will let you know how it goes good bad or ugly.Thermal arc 211iCk flex-loc 150 & 130Clamps, saws & grindersHarbor freight 80 amp inverter
Reply:Results are about the same wets in faster with a few less amps on Tig.  haven't tried mig yet going to cut some coupons this weekend and melt some metal. Maybe a few pics for the naysayers. Out the door cost for 80cf 75ar/25he $45.27. pure argon cost $43.68 for 80cf so no real loss I needed gas anyway.Thermal arc 211iCk flex-loc 150 & 130Clamps, saws & grindersHarbor freight 80 amp inverter
Reply:Same price as argon???Nice.I'll check around up here and.see....Just 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:Yeah within a couple bucks. My argon price was from airgas so I'm sure it's high. Got the mix from arcet they supply the south east coast not sure what argon costs from them.Thermal arc 211iCk flex-loc 150 & 130Clamps, saws & grindersHarbor freight 80 amp inverter