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Firebag
04-17-2005, 09:40 PM
Could someone out there give me a little advise? I have a wire feed welder that is set up to use either flux core wire or gas shielded wire. I have been using the flux corw with out the shielding gas. Could someone enlighten me as to which gas is appropriate for welding mild steel?

hoffman
04-17-2005, 09:42 PM
I use c25 and it does what I want it to do. I think it's carbon dioxide and argon. Ask the folks at the welding store.

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Deep Sea Tool Salvage

Rustystud
04-17-2005, 09:56 PM
Firebag:

I use a Lincoln Pro 200 Mig. For steel I use National Welders Tri Mix. It is the industry standard. For my Spool Gun I use 100% Argon for Aluminum. I use a Argon/Helium mix for stainless steel. I follow the manufacture recomended gases and have have great success with the mig welder.
Rustystud

precisionworks
04-17-2005, 09:58 PM
Mild steel? C-25.

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Barry Milton

3 Phase Lightbulb
04-17-2005, 09:59 PM
I use C25 also (75% Argon/25% C02) using mild steel wire.. You can use 100% argon, but you get better penitration with the C25.

-Adrian

snowman
04-17-2005, 10:40 PM
Ditto what 3 phase said

I think you'll also have to change the polarity for using MIG instead of just wire feed.

not entirely sure...

-Jacob

Joel
04-18-2005, 12:00 AM
Yep, you are going to need to reverse polarity to DCEP (electrode positive) when using gas. I also use 25%/75% for shielding on steel. Your penetration will be slightly reduced when using gas, but the weld will be cleaner.

You might also want to change wire diameters, as the flux core wires are often larger than you need when compared to welding with solid wire.