Another factor you may need to consider is the thickness of the coating of flux on your electrode. This measurement is indicated by a coating factor, which is the ratio of the rod’s diameter and the coating’s diameter. There’s some margin of error, but the three ranges center around these values. Light: A coating factor of around 1.25 Medium: A coating factor of around 1.45 Heavy: A coating factor of 1.6-2.2.

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