Chapter 9 Knowledge Check

Chapter 9

Quiz yourself using the following chapter review questions to check how well you can recall the material.

Review Questions

1. What are the two sub-processes of FCAW?
   1. FCAW-G and FCAW-S
   2. FCAW-I and FCAW-C
   3. FCAW-M and FCAW-T
   4. FCAW-A and FCAW-P
2. What is the main purpose of flux in FCAW?
   1. Allow superior welding of non-ferrous metals.
   2. Increase the cleanliness of the welding process.
   3. Make the weld metal thinner.
   4. Provide shielding, deoxidize, denitrify, and aid arc stabilization.
3. True or False: FCAW is often used in industries requiring high weld deposition rates.
4. What does CV stand for regarding welding power sources?
   1. Current Variable
   2. Central Voltage
   3. Constant Voltage
   4. Constant Variable
5. True or False: The contact tip is where the wire electrode is electrified.
6. A                      integrates the entire wire-feeding system into the welding gun itself.
7.                         drive rollers are used for FCAW wire, to allow it to grip the soft tubular wire without crushing it.
8. True or False: Some FCAW electrodes are suitable only for single-pass welds and cannot be used for multi-pass welding.
9. True or False: The type of shielding gas used in FCAW-G can affect the arc characteristics and the appearance of the weld.
10. What is the effect of using a slow travel speed in FCAW?
    1. Undercut and lack of fusion.
    2. An overly convex weld and overlap.
    3. Too fast wire feed.
    4. An undersized weld.

Answer Key

1. FCAW-G and FCAW-S. FCAW can use an externally supplied gas shield (FCAW-G) or the internal flux can generate the shielding gas to enable the wire to be self-shielding. (FCAW-S).
2. Provide shielding, deoxidize, denitrify, and aid arc stabilization. The flux included in the wire serves to remove the oxygen and nitrogen from the liquid weld pool, as well as stabilize the welding arc.
3. True. The FCAW process produces high quality welds very quickly  and economically compared to many other processes.
4. Constant Voltage. A Constant Voltage (CV) power source maintains a fairly constant voltage and arc length during wire feed welding.
5. True. The contact tip transfers the welding current to the wire electrode.
6. Spool gun. A spool gun combines a wire feeder, spool of wire, handle, conductor tube, nozzle, and contact tip into one compact hand held unit.
7. Knurled. Knurled drive rolls have small teeth in the grooves, allowing the drive rolls to grip and push the electrode without applying too much pressure.
8. True. When performing multi-pass welds, check the manufacturer’s specification to make sure your electrode is suitable.
9. True. Shielding gases affect the arc and finished weld appearance. Always check manufacturers recommendations when selecting the shielding gas.
10. An overly convex weld and overlap. A travel speed that is too slow will result in a “ropey” weld that is too convex or has overlap.