best gas for welding stainless sch 10 maderl bends

admin

i know argon ,but some one told me that Argon/CO2blends are very good as produce less surface oxide, good bead shape and wetting, broad penetration, and consistent quality.any truth in this be nice to know before i tackle my first manifold build
Reply:Originally Posted by hoochhenryhi know argon ,but some one told me that Argon/CO2blends are very good as produce less surface oxide, good bead shape and wetting, broad penetration, and consistent quality.any truth in this be nice to know before i tackle my first manifold build
Reply:Originally Posted by dave powelsonFor TIG or MIG?
Reply:http://weldingweb.com/vbb/showthread.php?t=43982
Reply:If you are MIG welding you can use certain mixes. I still don't think that Co2/Argon is one you would want for stainless. But I never MIG weld stainless. With TIG you can only use straight argon or argon/helium.Last edited by Felderthewelder; 10-29-2011 at 07:32 PM.
Reply:I have found for MIG, the tri mix is best.  Right now my LWS tells me Helium is hard to find and the cost is double.  I just had them drop a 300 cf of 98/2   (argon/Oxygen) for an All stainless grill I am building.  Short arc is the only way I can do it with out a ton of back purging etc.   I will report in a day or two how the 98/2 works compared to the trimix.  I found TIG to be too hot and more difficult to keep the back from sugaring.   With Mig, I seem to have more control of the heat.  I have burned up quite a bit of wire testing.   This grill is made out of 2 sheets of 1/8", a couple lengths of angle 304 $tainle$$.Real world weldin.  When I grow up I want to be a tig weldor.
Reply:I'll be interested to see your results David. I've got an idea for an inset double grill for a friend using basically the same materials. I'd planned to tig it, but if mig works well I might just invest in the gas as I've got a big roll of 308 SS wire I could use..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Hey Doug(DSW),I do a lot of SS restaurant fixes/fabs, & I've been using 98/2(ArCo2) w/309L(MIG) with superb results. I, too, will be interested to see some pics with the 98/2(ArO2).DennyComplete Welding/Machine/Fab. ShopMobile UnitFinally retired*Moderator*"A man's word is his honor...without honor there is nothing.""Words are like bullets.... Once they leave your muzzle, you cannot get them back."
Reply:I also will be watching.Craig is a big advocate for the 98%Argon/2%CO2 mix for SS but I've never heard of anyone using Ar/O2, except for spray arc.  I know with spray, the Ar/O2 mix yields a hottler arc than a 92%Ar/8%CO2 mix.Also, never heard of anyone (who knew what they're doing), claiming that they had more control over the heat with mig vs tig.  That's definitely a "new one" on me.Syncro 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:Here is what I found.   C/25 too much spatter.Trimix  works great98/2   Argon/ Oxygen   Not good.    Lays turds for beads or burns through.  I am trading for a 300cf of tri mix with a full credit for the 98/2.     LWS thought I was trying to pulse spray the stainless.  I did try it but its too frikkin hot for 1/8' Plate and angle.We will discuss the heat control thing later.  I'll give you a hint, Mig is more consistent.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by David RI found TIG to be too hot and more difficult to keep the back from sugaring.   With Mig, I seem to have more control of the heat.