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Spool Gun Handheld Wirefeed Welder Powered by Car Batteries

Step 3Flux Core Wire

Flux Core Wire
I bought this 2lb spool of flux-core wire for $7 from Harbor Freight. Looks like they're asking $20 for it now.
Here's a cheaper source of welding wire. $5/lb is a decent price.
Every welding supply shop and most hardware stores will carry something like it.

I get the .030" thick stuff. You need to get tips to match your wire, $3.50 for a pack of 5.

Online welding forums debate the merits of different vendor's wire and prices.
All agree on one thing. Don't let it get rusty.

If you've got a big spool you can reload the little ones like this.
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Author:TimAnderson
Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output devices. His detailed drawings of traditional ...
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