____________________ is a thin layer of dark gray or black iron oxide formed during the rolling process.
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Q17: The wire feed speed on charts are
Q18: Which of the following is true of
Q19: When used as pure gases for welding
Q20: The only difference between all GMA welding
Q21: Because of the constant-potential power supply, the
Q23: The exact shielding gas _ required for
Q24: The perpendicular welding gun angle produces welds
Q25: What can be done to keep the
Q26: Shielding gases in the gas metal arc
Q27: Explain how high gas flow rates can
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