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Spray transfer requires a high output welder (the 210 MIG or 270 MIG), the right shielding gas (90/10 Argon/CO2 mix), the right voltage setting for the proper wire size (the 210 MIG can spray transfer .030” on tap setting six, while the 270 MIG can spray transfer .030” and .035” wires but usually you have to be in the top two voltage tap settings).

While welding in the spray transfer mode, the weld will produce a humming sound with almost no spatter while the short arc transfer produces more of a crackling/buzzing sound and very fine spatter.