Chapter 4 Section A (Airframe Textbook Unit 3)

1. _____________ welding joins metals by blending compatible molten metals into one common part or joint.

Fusion

2. ________________ or nonfusion joining occurs when two or more pieces of steel are held together by a noncompatible molten brass or silver material.

Adhesion

3. The three basic types of fusion welding are:

a. __________________

b. __________________

c. __________________

gas

electric arc

electrical resistance

4. Gas welding utilizes what two gases?

a. __________________

b. __________________

oxygen

acetylene

5. The temperature of a neutral oxyacetylene flame is about _________________ degrees Fahrenheit

5,600 to 6,300

6. Electric arc welding produces a blinding light with ___________ and __________ rays which can ____________ both skin and eyes.

infrared

ultraviolet

burn

7. Anyone performing electric arc welding must wear:

a. ______________________

b. ______________________

c. ______________________

arc welding helmet

gloves

proper clothes

8. Shielded Metal Arc Welding (SMAW) is more commonly known as __________________ welding

stick

9. MIG welding may also be known as _______________ ________________ Arc Welding

gas metal

10. An uncoated wire is fed into the torch as a consumable electrode in ____________________ (TIG or MIG) welding.

MIG

11. The form of arc welding that fills most of the needs in aircraft maintenance is known as _________________ ________________ arc welding. This is commonly referred to by what three-letter designation? ________________

tungsten inert gas

TIG

12. A small wire of _______________ is used as the non-consumable electrode for TIG welding.

tungsten

13. In a TIG welder, the electric arc produces a temperature of up to _________________ degrees Fahrenheit.

11,000

14. When using direct current for TIG welding, the most heat is put into the work when the DC is connected with ____________________(straight or reverse) polarity.

straight

15. Two forms of electrical resistance welding are:

a. __________________

b. __________________

spot

seam

16. What three variables are controlled to get the proper weld using either of the two electrical resistance welding methods?

a. __________________

b. __________________

c. __________________

current

pressure

dwell time

17. The five basic types of weld joints are the:

a. ________________ joint.

b. ________________ joint.

c. ________________ joint.

d. ________________ joint.

e. ________________ joint.

butt

tee

lap

corner

edge

18. A cleanly formed oxyacetylene weld should encompass the following qualities:

a. __________________

b. __________________

c. __________________

d. __________________

uniform width

good penetration

adequate reinforcement

uniform ripples

19. Penetration of welded aircraft parts should be at a depth of ______________ percent of the thickness of the base metal.

100

20. In brazing, the filler metal is pulled between closely fitting parts by ___________________ action.

capillary

21. When brazing, the filler rod should be melted by _____________ (circle a or b).

a. Holding the rod in the flame of the torch.

b. Touching the rod to the hot metal.

b. Touching the rod to the hot metal.

22. Soft solder is a mixture of _________________ and _________________.

tin

lead

23. Fittings may be attached to stainless steel oxygen lines by _________________ soldering.

silver