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Old 03-03-2010, 02:50 AM   #1
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Default Welding SS with flux-core wire do I need shielding gas?

I previously welded fitting on a keggle with ss wire and argon mix shielding gas with mixed results. I heard about and purchased a spool of Blue Demon 0.035 "gasless flux-core stainless steel wire" to use in my Lincoln 3200 HD Weldpak. I recently was in Airgas buying brazing wire (for some ss fittings which failed miserabely) and mentioned gasless flux-core ss wire to the clerk helping me and he said "you'll still need shielding gas"; who is right? Does anyone here have any experience with this stuff? I know its not a substitute for TIG but I have welded quite a bit with this MIG setup and my previous Hobart Handler. Any help or techniques are appreciated.

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Old 03-03-2010, 10:24 AM   #2
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I've never used fluxed core on stainless, prefering tig, so I'll let someone else speak to the weld and adequacy of shielding. I will say that if you had mixed results with bare wire I'd be hesitant to use flux core. You'll get deeper penetration with it than the bare wire and if you aren't comfortable with it you can quite easily blow through something as thin as a keg. Make sure you try to stay on the coupling as much as possible.

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Old 03-04-2010, 04:13 PM   #3
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Thanks for the tip. Noone has ever used this stuff?

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Old 03-04-2010, 04:43 PM   #4
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I have never used it, but I would think you would need to back gas to prevent the sugaring. You might be able to use a paste flux instead of gas.

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Old 03-04-2010, 04:52 PM   #5
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Old 03-04-2010, 04:55 PM   #6
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part of the point of the flux core is so you do not have to use gas; however, splatter will increase...I would use gas to shield your weld, it will be much cleaner that way. But, I'm no expert, just what I have learned on the matter so take my thought for what its worth.

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Old 03-04-2010, 05:14 PM   #7
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I used some over the weekend to repair my neighbors pot that had a pin hole in one of the welds and to repair a crack on one of my kegel's skirting. It worked fine i had no problems with it. it welded nice cleaned it up with a sanding disk you can't even tell that i did any welding.

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Old 03-04-2010, 05:22 PM   #8
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Any pics Johnny?

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Old 03-04-2010, 06:01 PM   #9
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I say try it and report back...maybe use some anti spatter spray JIC

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Old 03-04-2010, 07:04 PM   #10
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Flux core is so you don't need shielding gas. I use it in the small miller matic around the house not on SS but for other items its really nice when you are welding something in windy conditions as the shielding gas gets blown away sometimes resulting in a nasty weld. Maybe the clerk meant backgass would be needed?

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