Metal Joining: Need, Approaches, Mechanisms.- Classification of Joining Processes.- Heat Generation and Protection of Weld.- Power Density & Peak Temperature of Welding Processes.- Physics of Welding Arc: Electron Emission and Welding Arc.- Physics of Welding Arc: Arc Initiation and Arc Maintenance.- Physics of Welding Arc: Arc forces, Electrode Polarity and Arc blow.- Physics of Welding Arc: Arc Efficiency, Metal Transfer and Melting Rate.- Arc Welding Power Source: Basic Characteristics.- Arc Welding Power Source: Basic Characteristics, Duty Cycle, and Feed Drives.
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