Chapter 7

Name________________________ Period__________

Chapter 7

1. Name the welding processes covered in this chapter which may use a shielding gas to shield the weld area?

2. What type welding current may be used with GTAW?

3. A GTAW electrode is held in the torch by a ______________.

4. GTAW welding power sources are constant _______________ machines.

5. Why is a high-frequency voltage used continually in an AC circuit that is being used for GTAW?

6. List five reasons why argon is more frequently used for GTAW than helium.

7. A regulator controls and measures ________. A flowmeter measures and controls the ________ of a gas.

8. The maximum amperage used on a gas-cooled GTAW torch is generally _______ amps.

9. What determines the nozzle diameter when selecting a nozzle for GTAW or GMAW?

10. What is the advantage or using thoriated tungsten electrodes?

11. The color coding of a 2% thoriated tungsten electrode is ____________ .

12. The arc welding power source used for GMAW and FCAW produces a constant ___________ .

13. Increasing the rate of speed on the wire feed in GMAW or FCAW increases the _______ in the circuit.

14. Which gas produces the deepest penetration when used in GMAW?

15. Describe the following GMAW electrode completely: ER90S-B3L

16. When feeding a FCAW electrode through the wire feed mechanism, care must be taken not to ________ the flux cored wire.

17. List five ways that FCAW wires are altered to meet the requirements of a weld.

18. Describe the following FCAW electrode completely: E80T-2

19. What number filter lens is recommended when GTAW steel with 80A?

20. What number filter lens is recommended when GMAW steel, using 220A?