Argon mixes for flux core

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Will 85/15 work with flux core? It seem like most manufacturers only spec C25 or straight CO2. Thanks for any insight.
Reply:If you are talking about regular flux core, you don't need gas.  If it is dual shield, see what the manufacturer recommends.
Reply:No gas required for self shielding wire. Most dual shield wires require co2 only. Why you use expensive mixed gas when it is not required?
Reply:Most flux-core wires made for 75/25 will be OK with 85/15. Lincoln makes a couple of wires designed specifically for higher argon mixes.JohnA few weldersA lot of hammersA whole lot of C-clamps
Reply:Yes it should work.  You may notice that the weld puddle might be slightly more fluid, or you may have to use different settings; particularly for vertical and over head welds.The bigger concern is that the mechanical properties may not match what's promised by the manufacturer.  All other things being equal, I'd guess that the strength of the weld might be slightly higher and toughness slightly lower, than described by the manufacturer's datasheet.So if you're making any kind of critical weld; the best choice would be to use the gas mix recommended by the filler metal manufacturer. Originally Posted by GjertsonWill 85/15 work with flux core? It seem like most manufacturers only spec C25 or straight CO2. Thanks for any insight.
Reply:RTFM.Some FCAW-G wires use 100% CO2, some use C25, some can use either, some can use other argon-CO2 blends as well.examples (first tech sheet I pulled up, other makes/brands of wires usually have similar variations):Fabcor 86R, C25 or C10 properties listed, speced as C25 or higher argon mixFabco RXR, 100% CO2Excel-Arc  71, 100% CO2 or C25RTFM.  The best laid schemes ... Gang oft agley ...