Describe the working principle of Arc Welding.

Describe the working principle of Arc Welding.
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Arc welding is the most extensively employed method of joining metal parts. Here the source of heat is an electric arc. The arc column is generated between an anode which is the positive pole of D.C. power supply and the cathode negative pole. When this two conductor of an electric circuits are brought together and separated for a small distance to 2 to 4 mm such that the current continue to flow through a path of a ionized particles called plasma and electric arc is formed.

The heat of the arc rises the temperature of the parent metal which is melted forming a pool of molten metal. The electrode metal or a welding rod is also melted and is transferred in to the metal in the form of globules of molten metal.

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