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a square number is a number times itself. Ex. 4 x4 = 16 16 is a square number.
depending on: the type of electrode, and gap between material, and material thickness, and whether or not the groove is beveled... roughly 1 electrode per 8 inches for a cover pass, and 1 electrode per 16 inches for a root pass
It means 16. Hope I hepled!
It is: (XVI) which means 1000*16 = 16,000
XVI represents the number sixteen, in Roman numerals.