Chapter 4 Section C (Airframe Textbook Unit 3)

1. Acetylene gas stored under a pressure of more than __________ pounds per square inch will become unstable.

15

2. Normal operating pressure for most welding jobs using acetylene is __________ to __________ psi.

4

8

3. Acetylene gas may be stored under pressure by combining it with __________.

acetone

4. The amount of acetylene gas in a steel cylinder is determined by the __________(weight or pressure) of the cylinder.

weight

5. The acetylene tank valve should be opened no more than __________ to __________ turn.

1/4

1/2

6. Oxygen must never be used in the presence of __________ based substances.

petroleum

7. Tanks previously filled with __________, __________ or __________ fluid must be __________ before beginning any welding operations.

gasoline

alcohol

hydraulic

steam-cleaned

8. Turning the acetylene regulator adjusting handle clockwise will __________(open or close) the valve.

close

9. The union nut for connecting the oxygen regulator to the cylinder valve has __________(right or left) hand threads.

right

10. The acetylene hose is colored __________ and has a __________(left or right) hand threaded fitting at each end.

red

left

11. The fittings on the __________(oxygen or acetylene) hose are identified by a groove cut around their hex nut fittings.

acetylene

12. The oxygen hose is colored __________ and has a __________(left or right) hand threaded fitting at each end

green

right

13. The torch most often used with cylinder gases is an __________(equal-pressure or injector) type.

equal-pressure

14. A torch designed for light-duty welding, such as one used with aircraft thin wall tubing, has its valve on the end of the torch near the __________ (tip or hoses).

tip

15. The lower the number of the welding tip (not the size of the orifice), the __________(smaller or larger) the tip.

smaller

16. The size of the orifice in a welding tip is measured with the shank of a(n) __________.

number drill

17. Torches should be lit with a(n) __________, not with __________.

striker

matches/lighters

18. Most mild steel filler rods are coated with __________ to prevent rust from forming on the surface of the rod.

copper

19. Oxyacetylene welding goggles __________(will or will not) provide adequate eye protection for electric arc welding.

will not

20. The lower the number of the welding goggle filter, the __________(lighter or darker) the filter.

lighter

21. A __________(blue or brown) filter should be used in the welding goggles for welding aluminum.

blue

22. The __________ of the metal to be welded will determine the size of the torch tip needed.

thickness

23. An oxyacetylene flame in which the feather of the outer cone just disappears into the inner cone is a(n) __________(oxidizing, neutral, or carburizing) flame.

neutral

23. An oxyacetylene flame in which the feather of the outer cone just disappears into the inner cone is a(n) __________(oxidizing, neutral, or carburizing) flame.

neutral

25. When an oxyacetylene welding torch is shut off, the __________(oxygen or acetylene) is shut off first.

acetylene