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Welding Variables: Amperage : controls fusion and penetration. Voltage : controls arc length. Travel speed :controls depth of penetration. Gas flow rate :protects weld from atmosphere. Electrode extension :affects penetration.

Welding is usually regarded as a joining process in which the work pieces are in atomic contact often with a filler metal with broadly similar properties. Hence soldering and brazing are excluded but both solid state and fusion welding are included.