Chapter 4 Section B (Airframe Textbook Unit 3)

1. Aluminum ___________________(does or does not) change its color as it melts.

does not

2. Which gas is better for torch welding aluminum, acetylene or hydrogen? __________________

hydrogen

3. The main advantage to oxyhydrogen welding is that the hydrogen flame burns much _________________(cleaner or hotter) than acetylene.

cleaner

4. The flame used for welding aluminum should be neutral or slightly ____________ (carburizing or oxidizing).

carburizing

5. An _________________ _________________ shields the puddle of molten metal to prevent the formation of oxides when TIG welding.

inert gas

6. Titanium must be welded in an atmosphere that prevents any ____________ or ___________ from contacting the hot metal.

oxygen

nitrogen

7. Exhaust stacks from an aircraft engine should be TIG welded using _______________ (DC or AC).

DC

8. A dented structural tube may be repaired with a welded patch provided the dent is no deeper than _____ the tube diameter and doesn’t involve more than _________ of the tube circumference.

1/10th

1/4th

9. A rosette weld is a form of ________________(lap or butt) weld.

lap

10. The ends of a reinforcing tube used over a damaged tube in an aircraft structure can be cut with either a 30-degree ________________ or a(n) ________________.

scarf

fish-mouth

11. Use of __________________ parts on a landing gear assembly makes welding repairs __________ or _____________.

heat treatment

difficult

impossible