Copyright Goodheart-Willcox Co., Inc. 238 Modern Welding 2. Which statement about short circuiting metal transfer is false? A. It can be used in all positions. B. It is particularly useful for thin metal sections. C. It has high heat input into the base metal. D. It is used with low welding currents. 3. The property in an electric circuit that slows down the rate of current change is _____. A. constant voltage B. inductance C. inverter D. slope 4. The current required for the transfer method to change from globular to spray transfer must be above the _____ current. A. transition B. peak C. background D. inductance 5. Spray transfer occurs only when the shielding gas is _____. A. 75% argon–25% CO2 B. 90% helium, 7 1/2% argon, and 2 1/2% CO 2 C. at least 50% CO2 D. at least 80% argon 6. How many pounds (kilograms) of fi ller metal can be deposited per hour with the spray transfer method? A. 2–6 (.9–2.7). B. 4–7 (1.8–3.2). C. 6–12 (2.7–5.4). D. 12–18 (5.4–8.1). 7. True or False? A knurled drive wheel is used for fl ux cored steel and aluminum electrodes. Match the following voltages to the base metal and electrode diameters. Use Figure 8-14 through Figure 8-19. 8. .035″ (0.9 mm) spray transfer on carbon steel 9. .045″ (1.2 mm) spray transfer on stainless steel 10. .035″ (0.9 mm) short circuiting transfer on carbon steel 11. 3/32″ (2.4 mm) spray transfer on aluminum 12. .035″ (0.9 mm) short circuiting transfer on stainless steel A. 15–21V B. 16–22V C. 17–22V D. 24–28V E. 24–30V F. 24–33V G. 26–34V 13. Which statement about the pulsed spray transfer method is false? A. This method can be used for brazing thin steel parts. B. Spray transfer occurs during the background current time period. C. The metal deposition rate is 2 lb–6 lb/hr (0.9 kg–2.7 kg/hr). D. The droplet size decreases as the pulse frequency increases. 14. True or False? A 90% argon, 10% carbon dioxide shielding gas is the gas typically used for FCAW–S. 15. Which statement about contact tips is false? A. Whenever the wire diameter is changed, the contact tip must be changed. B. The contact tip contacts the welding wire and passes electricity to it. C. Contact tips must be changed regularly due to wear. D. Shorter-length contact tips are used for short circuiting transfer. 16. True or False? Small-diameter welding wire is deposited at a higher rate than large-diameter welding wire. 17. What stickout length should be used with short circuiting transfer? A. 1/4″–1/2″ (6 mm–13 mm). B. 3/8″–1″ (9 mm–25 mm). C. 1/2″–1 1/2″ (13 mm–38 mm). D. 3/4″–3 3/4″ (19 mm–95 mm). 18. To restart a weld, the arc should be struck _____ in front of the existing weld crater. A. 1/4″ (6 mm) B. 3/8″ (9 mm) C. 1/2″ (13 mm) D. 3/4″ (19 mm) 19. True or False? The groove angle in a joint that will be welded with GMAW can be smaller than the groove angle in a joint that will be welded with SMAW. 20. True or False? Travel speed affects weld bead width in FCAW. 21. Which of the following is the suggested travel angle for GMAW in the fl at position? A. 5°–20°. B. 15°–25°. C. 45°. D. 90°.