Welding

Question 1

In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to

Answer 1

Prevent the formation of oxide in the puddle

Question 2

Which statement best describes magnesium welding?

Answer 2

Filler rod should be the same composition as base metal

Question 3

Which statement is true in regard to welding heat-treated magnesium?

Answer 3

The weld section does not have the strength of the original metal

Question 4

The oxyacetylene flame for silver soldering should be

Answer 4

Neutral

Question 5

Why is it necessary to use flux in all silver soldering operations?

Answer 5

To chemically clean the base of oxide film

Question 6

Engine mount members should preferably be repaired by using a

Answer 6

Larger diameter tube with fishmouth and rosette welds

Question 7

What method of repair is recommended for a steel tube longeron dented at a cluster?

Answer 7

Welded patch plate

Question 8

Welding over brazed or soldered joints is

Answer 8

Not permitted

Question 9

Which statement concerning soldering is correct?

Answer 9

joints in electric wire to be soldered should be mechanically secure prior to soldering

Question 10

A resurfaced soldering iron cannot be used effectively until after the working face has been

Answer 10

Tinned

Question 11

Which of the following can normally be welded without adversely affecting strength?
1. Aircraft bolts.
2. SAE 4130 chrome/molybdenum tubing.
3. Spring steel struts.
4. Most heat-treated steel/nickel alloy components.

Answer 11

2

Question 12

In selecting a torch tip size to use in welding, the size of the tip opening determines the

Answer 12

Amount of heat applied to the work

Question 13

Why should a carburizing flame be avoided when welding steel?

Answer 13

It hardens the surface

Question 14

The most important consideration(s) when selecting welding rod is

Answer 14

Material compatibility

Question 15

The oxyacetylene flame used for aluminum welding should

Answer 15

Be neutral and soft

Question 16

A very thin and pointed tip on a soldering copper is undesirable because it will

Answer 16

Cool too rapidly

Question 17

Filing or grinding a weld bead

Answer 17

Reduces the strength of the joint

Question 18

Acetylene at a line pressure above 15 PSI is

Answer 18

Dangerously unstable

Question 19

Cylinders used to transport and store acetylene

Answer 19

Contain acetone

Question 20

A welding torch backfire may be caused by

Answer 20

A loose tip

Question 21

Which statement concerning a welding process is true?

Answer 21

The inert arc welding process uses an inert gas to protect the weld zone from the atmosphere

Question 22

Where should the flux be applied when oxyacetylene welding aluminum?

Answer 22

Painted on the surface to be welded and applied to the welding rod

Question 23

What purpose does flux serve in welding aluminum?

Answer 23

Minimize or prevent oxidation

Question 24

Why are aluminum plates 1/4 inch or more thick usually preheated before welding?

Answer 24

Reduces internal stresses and assures more complete penetration

Question 25

How should a welding torch flame be adjusted to weld stainless steel?

Answer 25

Slightly carburizing

Question 26

Oxides form very rapidly when alloys or metals are hot. It is important, therefore, when welding
aluminum to use a

Answer 26

Flux

Question 27

In gas welding, the amount of heat applied to the material being welded is controlled by the

Answer 27

Size of the tip opening

Question 28

Oxygen and acetylene cylinders are made of

Answer 28

Steel

Question 29

When a butt welded joint is visually inspected for penetration,

Answer 29

The penetration should be 100 percent of the thickness of the base metal

Question 30

Annealing of aluminum

Answer 30

Remove stresses caused by forming

Question 31

Edge notching is generally recommended in butt welding above a certain thickness of aluminum
because it

Answer 31

Aids in full penetration of the metal and prevents local distortion

Question 32

If too much acetylene is used in the welding of stainless steel,

Answer 32

The metal will absorb carbon and lose its resistance to corrosion

Question 33

The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminum consist of

Answer 33

Helium or argon or a mixture of helium and argon