Welding

Question 1

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

Answer 1

Prevent the formation of oxides in the puddle.

Question 2

What statement best describes magnesium welding?

Answer 2

Filler rod should be the same composition as base metal.

Question 3

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

Answer 3

The welded section does not have the strength of the original metal.

Question 4

What statement best describes magnesium welding?

Answer 4

It can be welded successfully using the same type of joints that are used for aluminum.

Question 5

The oxyacetylene flame for silver soldering should be…

Answer 5

Neutral.

Question 6

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

Answer 6

To chemically clean the base metal of oxide film.

Question 7

Engine mount members should preferably be repaired using a…

Answer 7

Larger diameter tube with fishmouth and rosette welds.

Question 8

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

Answer 8

Welded patch plate.

Question 9

Welding over brazed or soldered joints is…

Answer 9

Not permitted.

Question 10

What statement concerning soldering is correct?

Answer 10

Joints in electric wire to be soldered should be mechanically secure prior to soldering.

Question 11

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

Answer 11

Tinned.

Question 12

What can normally be welded without adversely affecting strength?

Answer 12

SAE 4130
chrome/molybdenum tubing.

Question 13

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

Answer 13

Amount of heat applied to the work.

Question 14

Why should a carburizing flame be avoided when welding steel?

Answer 14

It hardens the surface.

Question 15

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

Answer 15

Material compatibility.

Question 16

When selecting a welding rod, one of the most important factors to consider is to ensure that…

Answer 16

The proper AMS number is used.

Question 17

The oxyacetylene flame used for aluminum welding should…

Answer 17

Be neutral and soft.

Question 18

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

Answer 18

Cool too rapidly.

Question 19

Filing or grinding a weld bead is considered to be…

Answer 19

A way to bring about strength reduction in joint.

Question 20

Acetylene at a line pressure above 15 psi is…

Answer 20

Dangerously unstable.

Question 21

Cylinders used to transport and store acetylene…

Answer 21

Contain acetone.

Question 22

A welding torch backfire may be cause by…

Answer 22

A loose tip.

Question 23

What statement concerning a welding process is true?

Answer 23

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

Question 24

What purpose does flux serve in welding aluminum?

Answer 24

Minimizes or prevents oxidation.

Question 25

Where should the flux be applied when oxyacetylene welding aluminum?

Answer 25

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

Question 26

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

Answer 26

Reduces internal stresses and assures more complete penetration.

Question 27

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

Answer 27

Slightly carburizing.

Question 28

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

Answer 28

Flux.

Question 29

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

Answer 29

Size of the tip opening.

Question 30

When welding or cutting, the acetylene pressure gauge should never be set higher than...

Answer 30

15 psi.

Question 31

Oxygen and acetylene cylinders are made of...

Answer 31

Steel.

Question 32

High pressure cylinders used to transport and store acetylene must...

Answer 32

Contain acetone.

Question 33

When a butt-welded joint is visually inspected for penetration, the penetration should be...

Answer 33

100 percent of the thickness of the base metal.

Question 34

Annealing of aluminum...

Answer 34

Removes stresses caused by forming.

Question 35

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

Answer 35

Aids in getting full penetration of the metal and prevents local distortion.

Question 36

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

Answer 36

The metal will absorb carbon and lose it resistance to corrosion.

Question 37

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

Answer 37

Helium or argon, or a mixture of helium or argon.

Question 38

Why should an aircraft maintenance technician be familiar with weld nomenclature?

Answer 38

In order to gain familiarity with the welding technique, filler material, and temperature range used.

Question 39

Identify the weld cause by an excessive amount of acetylene.

Answer 39

3

Question 40

Select the illustration which depicts a cold weld.

Answer 40

2

Question 41

Why is it considered good practice to normalize a part after welding?

Answer 41

To relieve internal stresses developed within the base metal.

Question 42

Holes and a few projecting globules are found in a weld. What action should be taken?

Answer 42

Remove all the old weld, and reweld the joint.

Question 43

Which condition indicates a part has cooled too quickly after being welded?

Answer 43

Cracking adjacent to the weld.

Question 44

What is a characteristic of a good gas weld?

Answer 44

The weld should taper off smoothly into the base metal.

Question 45

One characteristic of a good weld is that no oxide should be formed on the base metal at a distance from the weld of more than...

Answer 45

1/2 inch.

Question 46

In examining and evaluating a welded joint, a mechanic should be familiar with...

Answer 46

Likely ambient exposure conditions and intended use of the part, along with type of weld and original part material composition.

Question 47

What type weld is shown at A?

Answer 47

Butt.

Question 48

What type weld is shown at B?

Answer 48

Double butt.

Question 49

What type weld is shown at G?

Answer 49

Lap.

Question 50

On a fillet weld, the penetration requirement includes what percentage(s) of the base metal thickness?

Answer 50

25 to 50 percent.