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概要

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The authors described the theoretical definition of eccentricity of coated welding electrode by the theory of the inclined melting of coating. There are four types of the eccentricity of coated electrode, which may be expressed by the following formulas[numerical formula], where α : eccentricity; a : maximum thickness of coating at one cross-section of welding electrode; b : minimum thickness of coating at same section; d : diameter of core wire; D : outside diameter of coating. Explanation was made of measuring methods of the eccentricity and its measuring errors. Next, research was made of the relations between the eccentricity and the inclined melting of coating by both theory and actual welding, and as a result obtained the following : tanθ=K.χ, where θ : angle of the tip of the electrode formed as a result of the inclined melting; α : eccentricity; K : constant which is determined by the qualities of flux and core wire.
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