Question

b. true - false
in the space to the left, write the letter t if the statement is true and the letter f if the statement is false.

1. gma can be used to make high - quality arc spot welds.
2. the main limitation of flux cored arc welding is that only ferrous metals can be welded.
3. knurled v - groove feed rollers are best suited for soft wires such as aluminum.
4. changes in gun angle, electrode extension, and weave pattern cannot be made without stopping the weld.
5. the short - circuiting process is too cold to be effective for making quality welds in sections much thicker than 1/4 - inch (6 mm) metal.
6. carbon - dioxide is a reactive gas which restricts its applications to welding carbon steel.
7. the wire feed speed setting also determines the current.
8. both flux cored arc welding (fcaw) and submerged arc welding (saw) use a different power source than the gmaw process.
9. the major disadvantage of fcaw is its low deposition rate.
10. the addition of scavengers in some of the fcaw wires is used to remove sulfur from the weld metal.

Explanation:

1. Gas - Metal Arc Welding (GMAW) can produce high - quality arc spot welds, so it's true.
2. Flux cored arc welding can weld non - ferrous metals too, so it's false.
3. Knurled V - groove feed rollers can damage soft wires like aluminum, so it's false.
4. Changes in gun angle, electrode extension, and weave pattern can be made during welding, so it's false.
5. The short - circuiting process is too cold for thick sections, so it's true.
6. Carbon - dioxide is reactive and mainly used for welding carbon steel, so it's true.
7. Wire feed speed is related to current in welding, so it's true.
8. FCAW and SAW can use similar power sources as GMAW, so it's false.
9. FCAW has a high deposition rate, so it's false.
10. Scavengers in FCAW wires can remove sulfur, so it's true.

Answer:

1. T
2. F
3. F
4. F
5. T
6. T
7. T
8. F
9. F
10. T