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Best Answer: You're wrong about what the arctan function is. arctan is that function that answers the question, What angle theta yields the tan (theta) = x? arctan 0 = 0 because the tan 0 = sin 0 / cos 0 = 0/1 = 0.
FCAW-S Basics: Fast, No Gas Cylinders Required The self-shielded process usually is not the first a welder learns, but it can be one of the most effective. by Tom Myers and Frank Dragolich, Jr. Self-shielded flux-cored arc welding (FCAW-S) wire is the industryâs multitasker. All at once, it produces its own shielding to help protect the arc, handles contaminants on the steel, deposits weld metal that meets structural requirements, and forms a fast-freezing slag over the weld metal.