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Key Takeaway Basic Principle: Arc welding machines create an electric arc between an electrode and the workpiece, generating intense heat to melt metals and join them together.Power Source: They use either AC or DC power to generate the arc, with DC offering better stability for most welding applications.Electrode Function: The electrode can be consumable (melts to form the weld) or non-consumable (used with filler materials).Shielding Protection: Arc welding requires shielding to protect the we …