Maintenance Practices M7.15A Flashcards

1
Q

What is capillary action

A

The process in which the solder flows between 2 surfaces

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2
Q

What is high temp solder

A

Tin Antimony lead solder

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3
Q

Up to what % antimony increases solder strength

A

6%

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4
Q

What is the most common non corrosive flux

A

Rosin

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5
Q

Sulphur embrittlement

A

Cannot restore

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6
Q

What is the cylinder colour for acetalyne

A

Maroon

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7
Q

What is pure acetalyne dissolved in

A

Acetone and pressurised to 15 bar

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8
Q

Why are acetalyne bottles kept upright

A

Because acetalyne is very unstable

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9
Q

What pressure must acetalyne not exceed when being used as a fuel

A

15 psi

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10
Q

At what pressure will acetalyne explode

A

29.4psi

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11
Q

Check valves on acetalyne bottles are only to prevent return of flow what is used as a flashback arrestor

A

Flashback arrestors

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12
Q

What are the two different types of oxy acetalyne torches

A
  • Equal pressure
  • Injector type
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13
Q

Why is equal pressure Better than the injector type

A

More stable and safe. Less susceptible to flashback

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14
Q

What is fusion welding

A

Electrically bonding 2 pieces together

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15
Q

What is a class A fusion weld

A

A vital joint (Failure would jeopardise the aircraft safety)

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16
Q

What is a Class B1 Fusion weld

A

A secondary structure (Failure would not jeopardise the aircraft safety)

17
Q

What is a Class B2 fusion weld

A

Non structural

18
Q

Is the TIG electrode consumed or not consumed during the welding process

A

Not consumed

19
Q

What does TIG stand for

A

Tungsten Inert Gas

20
Q

What gas does TIG use

21
Q

Why do you not need to use a flux with TIG welding

A

Argon gas is used which is an inert gas

22
Q

What current can be used with TIG welding

A

AC or DC current

23
Q

The gas metal arc and gas tungsten arc welding processes are known as what

A

Gas shielded arc process

24
Q

Which welding process electrode doubles as the weld feed and is consumed

25
During the MIG process what helps stop the surface from oxidising
Inert gas and shielding process
26
How to inspect a weld to see if it’s of good quality
- Visual check - Uniform in width - No burn marks - No oxide present
27
What is Porosity
When gas is trapped in a weld
28
What is the best way to detect porosity in a weld
X ray
29
What is used during the brazing process
Bonding 2 pieces of metal with zinc/copper alloy filler
30
Is brazing high temp or low temp
Low temp
31
What adhesive relies on atmosphere
Contact adhesive
32
What does bonding rely on to be strong and of good quality
Adhesion and cohesion
33
Which must be stronger adhesion or cohesion
Adhesion
34
What is wetting
Making sure there is a good surface for bonding
35
What is capillary action
When two materials are together the binding agent will fill the narrow gaps to perform the bond
36
Bond line thickness must not be greater than what
0.1mm