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Resist the urge to go with "flux core" welding wire, and get a separate shielding gas setup. Shielding gas (usually argon/CO2 in a 75/25-percent ratio, respectively) is blown onto the weld-pool and chases out oxygen and impurities, giving the molten work piece the best possible chance to fuse to another piece of metal. Don't skimp on safety, either. Notice the gloves and welding helmet.