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Airframes > Welding > Flashcards

Welding Flashcards

1
Q

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

A

To chemically clean the base metal of oxide film.

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2
Q

Which statement concerning soldering is correct?

A

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

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3
Q

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

A

tinned.

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4
Q

Which of the following can normally be welded without adversely affecting strength?

A

2 (SAE 4130 chrome/molybdenum tubing.

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5
Q

A very thin and pointed tip on a soldering coppper is undersiable because it will…?

A

cool to rapidly.

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6
Q

Filing or grinding a weld bead…?

A

reduces the strength of the joint.

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7
Q

Which statement concerning a welding process is true?

A

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

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8
Q

What purpose does the flux serve in welding aluminum?

A

Minimizes or prevents oxidation.

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9
Q

Oxides for very rapidly when alliys or metals are hot. It is important, therefore, when welding aluminum to use a…?

A

flux

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10
Q

When a butt welded joint is visually inspected for penetration,

A

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

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11
Q

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

A

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

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12
Q

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

A

helium or argon, or a mixture of helium and argon

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13
Q

Which statement best describes magnesium welding?

A

Filler rod should be the same composition as base metal.

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14
Q

Which statement is true regarding to welding heat-treated magnesium?

A

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

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15
Q

Engine mount members should preferably be repaired by using a…?

A

larger diameter tube with fishmouth and rosette welds.

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16
Q

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

A

Welded patch plate.

17
Q

The oxyacetylene flame used for aluminum welding should…?

A

be neutral and soft.

18
Q

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

A

amount of heat applied to the work.

19
Q

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

A

material compatibility.

20
Q

Acetylene at a line pressure above 15 PSI is…?

A

dangerously unstable.

21
Q

Cylinders used to transport and store acetylene…?

A

contain acetone.

22
Q

A welding torch backfire may be caused by…?

A

a loose tip.

23
Q

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

A

Reduces internal stresses and assures more complete penetration.

24
Q

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

A

Slightly carburizing.

25
Q

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

A

size of the tip opening.

26
Q

Oxygen and acetylene cylinders are made of…?

A

steel.

27
Q

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

A

the metal will absorb carbon and lose its resistance to corrosion.

28
Q

Where should the flux be applied when oxyacetylene welding aluminum?

A

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

29
Q

Why should a carburizing flame be avoided when welding steel?

A

It hardens the surface.

30
Q

The oxyacetylene flame for silver soldering should be…?

A

neutral.

31
Q

Annealing of aluminum…?

A

removes stresses caused by forming.

32
Q

Filing or grinding a weld bead is considered to be…?

A

a way to bring about strength reduction in joint.

33
Q

Welding over brazed or soldered joints is…?

A

not permitted.

34
Q

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

A

prevent the formation of oxides in the puddle.

Airframes (14 decks)

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