Wswb19

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Name______________________________________________ Date_________________________ True‑False T F 1. A pull type wire feeder is used for welding with soft and small-diameter electrodes. T F 2. In a constant‑voltage welding machine, arc length remains constant with changes in electrode extension. T F 3. A constant-voltage welding machine is commonly used for GMAW. T F 4. Alternating current is used for welding in overhead position on mild steel. T F 5. The constant‑voltage welding machine has a slightly sloping volt‑ampere curve. T F 6. Inadequate gas shielding is one cause of porosity. T F 7. Poor arc starting is a symptom of a worn contact tip. T F 8. If electrode extension is increased, welding current is decreased. T F 9. The letter S in the electrode designation ER70S-3 stands for short circuiting transfer. T F 10. Voltage is increased by increasing the wire feed speed. T F 11. In semiautomatic GMAW, the operator sets the welding parameters, and the welding gun is controlled by a mechanical device. T F 12. DCEP produces deep penetration and excellent cleaning action. T F 13. Argon is commonly used as a shielding gas when welding aluminum with GMAW.

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