Functions of Electrode Coatings

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To stabilize the arc.
To provide gaseous atmosphere for protection from atmospheric gases like O, H, N, etc.
To remove impurity in the form of slag. Slag also protects the molten pool of metal and reduces cooling rate.
To reduce spatter of weld metal.
To act as deoxidizer, i.e., to reduce the melting point of metal oxide.
To include or add the alloying elements.
To insulate the electrode.
To slow down the fast cooling rate of the weld.
To increase the deposition efficiency.

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