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I need to know if i need to buy flux-core wire to use a eletric welder its a gas free one
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Welcome aboard!
If you have a wire welder that does NOT use gas shielding, then you will have to run a flux cored wire like Lincoln's InnerShield, Coreshield, etc. You cannot run bare wire because there is nothing to shield the weld puddle from the atmosphere and you will have nothing but metal globs full of pinholes. Once you weld a pass, then chip the slag covering the weld and brush the weld clean. Make a second pass if required.
Good luck.
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