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Last year sometime went to the local AirGas location to get a tank of Argon and a spool gun since I was planning on trying some aluminum welding with my Miller 252 mig machine. While there I told them to load me a tank of Tri-Mix so I could use it for any stainless that came up. So today I needed to repair some stainless, luckily a very small task, and got the TriMix tank out and noticed it was 90% Argon, 8% CO2, and 2% Oxygen. I guess my idea of Tri-mix was different than the salesman's idea but I'm a novice welder so probably my mistake. I wanted Helium/argon/CO2. I was thinking I would call them, explain and see if they would exchange it but I'm curious about this mixture they gave me. I only found a few mentions of it googling it. Is there any advantage to this mixture and should I keep it around? I already have 75 Argon/25 CO2 and 100% Argon.
Reply:With a 252 that mix can be used for spray arc on mild steel. The CO 2 percentage makes it a poor choice for stainless.ESAB Migmaster 250 Hobart Ironman 230Multimatic 215TWECO Fabricator 181i & 211iHH125EZ - nice little fluxcore only unitMaxstar 150 STH - very nice
Reply:I've been using a lot of 308/308L and 309 stainless stick rods on jobs. It's working our pretty well for what I need. Of course if one isn't good with stick welding to begin with, than one shouldn't use stick stainless electrodes. I will say however that the cost is Significantly cheaper than trimix (helium) gas and stainless wire for my projects.A Liberal is someone who lives in a gated community with private security, but says that a boarder fence won't work and people don't need guns for self protection.
Reply:@ ALincarolina - invest some time reading this publication: http://www.lincolnelectric.com/asset...L-50/c4200.pdf. Table I (p.9) and p.14 covers options for axial spray transfer for SS and mild steel materials. Your existing blend should work fine for axial spray on mild steel, but not stainless steel. Although most folks use "TriMix" (90%He, 7-1/2%Ar, 2-1/2%CO2) for short-circuit transfer on stainless, the tertiary blend is $$$. A binary blend of 98% Ar / 2% CO2 for axial spray on SS is an alternative. Note, my LWS charges $130-140 to fill "TriMix" for an 80CF/155CF. By comparison, C25 is ~ $42.After my 80CF of 98%Ar/2%O2 is expended, gun'a fill her up with 98Ar/2CO2 and give it a try.Last edited by ManoKai; 02-14-2015 at 07:49 AM.Reason: $ cost considerations $"Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:Argon with 3 - 5% CO2 is good for spray- and pulsed-spray welding of SS but not as nice as tri-mix for short-arc. The OP's mix is OK for steel but no good out-of-position even with pulse.JohnA few weldersA lot of hammersA whole lot of C-clamps
Reply:Thanks for all the help. Maybe I'll keep the tank and get another of the tertiary Helium. What I'm hearing is that the 90Argon/8CO2/2 O2 may be better than the C25 for axial spray on mild steel. Thanks for the Lincoln link ManoKai I'll read some more this week. |
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发表于 2021-8-31 22:43:25