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Module 7: Maintenance Practices (B1) > 7.15 - Welding, Brazing, Soldering and Bonding > Flashcards

7.15 - Welding, Brazing, Soldering and Bonding Flashcards

1
Q

What is the oxygen acetylene welding procedure?

A

Lighting up oxygen acetylene welding procedure.
Acetylene is ignited first, pressure increased until black smoke stops and then oxygen is introduced

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2
Q

Why is Flux not required with oxygen acetylene welding?

A

Flux is not required with oxygen acetylene welding because the gas by-products of the flame protect the weld

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3
Q

When must flux be used?

A

Flux must be used when welding nonferrous metal

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4
Q

What are the 4 forces on a bonded joint?

A

Four forces on a bonded joint are:
1. Tension
2. Shear
3. Cleverage
4. Peel

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5
Q

What does a bonded joint need to cure correctly?

A

To cure correctly a bonded joint needs pressure and heat

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6
Q

Acetylene will form an explosive mixture when combined with _________________

A

Acetylene will form an explosive mixture when combined with copper and silver

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7
Q

MIG welding is constant ______

A

MIG welding is constant voltage

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8
Q

Flux used for soldering electrical components is ___________

A

Flux used for soldering electrical components is passive

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9
Q

At what temperature does Eutectic solder melt and solidify?

A

Eutectic solder melts and solidifies at 183^C. Sn63 (Tin)

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10
Q

At what temperature does 60/40 solder melt and solidify?

A

60/40 - melts at 183^C. Solid at 192^C

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11
Q

What are the 3 major factors of the heat cycle?

A

Heat cycle 3 major factors:
1. Relative thermal mass
2. Surface condition
3. Thermal linkage

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12
Q

What property does Active flux present?

A

Active flux, corrosive

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13
Q

What property does passive flux present and what is it used for?

A

Passive flux, non-corrosion. Use this one for electrical.

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14
Q

What should be noted above 450^C?

A

Above 450^C its brazing or hard soldering

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15
Q

What temperature is Hook repair at?

A

Hook repair is at 270^C

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16
Q

What does Oxyacetylene welding cause?

A

Oxyacetylene welding causes the least stress

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17
Q
A

To remove oxidation and prevent any further contamination of the parent material

'’As with welding, it is necessary to employ the use of a flux material to assist the fusion of the filler with the parent metals and to prevent oxidation of the joint’’

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18
Q
A

They are the best gases to generate the temperatures necessary for welding

'’For welding, however, only an oxygen and acetylene mixture will provide a sufficiently, high heat input, needed for the welding process’’

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19
Q
A

The electrode is consumed by the welding process

'’In this semi-automatic welding process the heat source is also an electric arc, but the electrode is a bare wire, which is consumable and is supplied, from a reel, to the welding gun, by a wire feed unit.’’

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20
Q
A

The acetylene gas is ignited first, the pressure is increased until the black smoke stops and then the oxygen is introduced.

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21
Q
A

The gas byproducts of the flame protect the weld pool from contamination

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22
Q
A

Shield metal arc welding
(Manual Metal Arc Welding)

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23
Q
A

True
‘‘Flux must be used when welding nonferrous metal’’

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24
Q
A

The resistance to the electrical flow between two electrodes by the parent material (workpiece)

Resistance Spot Welding
A method used to join comparatively thin sheets of metal, spot welding is a form of resistance welding. The sheets of metal are sandwiched between two, pointed electrodes on which force is exerted as the current is applied. The heat is generated at a local spot where the resistance to the flow of the electricity is at its highest and the metal fuses at these spots.

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25
Q
A

Tension, Shear, Cleverage and Peel

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26
Q
A

Pressure and heat

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27
Q
A

True

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28
Q
A

Copper and silver

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29
Q
A

True

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30
Q
A

Passive

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31
Q
A

True

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32
Q
A

pickled

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33
Q
A

a high resistant joint potential

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34
Q
A

too little heat

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35
Q
A

neutral

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36
Q
A

to dissolve oxides

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37
Q
A

To chemically clean the base metal of oxide film

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38
Q
A

The soldering iron and solder should be applied simultaneously to the connection

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39
Q
A

non-active

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40
Q
A

60^C above the melting point of solder

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41
Q
A

Tin and lead

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42
Q
A

Some dissimilar metals

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43
Q
A

must be cleaned off with a selected solvent

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44
Q
A

components not hot enough

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45
Q
A

standing wave bath method

46
Q
A

tinned

47
Q
A

tin / lead / antimony / silver

48
Q
A

600^C - 850^C

49
Q
A

helium or argon, or a mixture of helium and argon

50
Q
A

Type and thickness of the metal to be welded

51
Q
A

Sides sloping to the base metals

52
Q
A

copper zinc and silver

53
Q
A

reduces the strength of the joint

54
Q
A

prevent the formation of oxides in the puddle

Tungsten Inert Gas Welding (TIG)
This process also uses an electric arc as the heat source, but here a tungsten non-consumable electrode is used to form the arc with the workpiece. An inert shielding gas (argon) is required to protect both the weld pool and the tungsten electrode fromt he oxygen and moisture in the atmosphere.

55
Q
A

release the stresses from the material

56
Q
A

flux

57
Q
A

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

58
Q
A

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

59
Q
A

Oxides mixed in with the filler material

60
Q
A

Amount of heat applied to the work

61
Q
A

Material Compatibility

62
Q
A

the parent (or base) materials are fully fused together

63
Q
A

Option A: pickled

64
Q
A

Option B: a high resistance joint potential

65
Q
A

Option C: too little heat

66
Q
A

Option C: neutral

67
Q
A

Option A: to dissolve oxides

68
Q
A

Option B: D

69
Q
A

Option C: To chemically clean the base metal of oxide film

70
Q
A

Option B: the soldering iron and solder should be applied simultaneously to the connection

71
Q
A

Option B: non-active

72
Q
A

Option C: 60^C above the melting point of solder

73
Q
A

Option B: Tin and lead only

74
Q
A

Option B: a letter coding

75
Q
A

Option C: wire flux cored solder

76
Q
A

Option A: some dissimilar metals

77
Q
A

Option A: dissolve oxides

78
Q
A

Option C: must be cleaned off with a selected solvent

79
Q
A

Option B: components not hot enough

80
Q
A

Option A: It must be immersed in a weak solution of hydrochloric acid and rinsed thoroughly in running water

81
Q
A

Option C: stainless steel

82
Q
A

Option C: standing wave bath method

83
Q
A

Option C: stick solder needing a separate flux and solder in wire form having a rosin core

84
Q
A

Option C: tinned

85
Q
A

Option C: tin / lead / antimony / silver

86
Q
A

Option C: subjected to small forces

87
Q
A

Option C: 600^C - 850^C

88
Q
A

Option B: a defect associated with a soldered joint

89
Q
A

Option B: high temperature applications

90
Q
A

Option C: copper, zinc and silver

91
Q
A

Option A: brass and mild steel

92
Q
A

Option C: Minimises or prevents oxidation

93
Q
A

Option C: helium or argon, or a mixture of helium and argon

94
Q
A

Option C: Type and thickness of the metal to be welded

95
Q
A

Option C: Sides sloping to the base metals

96
Q
A

Option A: copper zinc and silver

97
Q
A

Option C: reduces the strength of the joint

98
Q
A

Option A: prevent oxides from forming ahead of the weld

99
Q
A

Option B: prevent the formation of oxides in the puddle

100
Q
A

Option C: release the stresses from the material

Note: Normalising removes local stresses set up by the heat, and in turn prevents corrosion.

101
Q
A

Option C: borax powder

102
Q
A

Option C: flux

103
Q
A

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

104
Q
A

Option A: the penetration should be 100 percent of the thickness of the base metal

105
Q
A

Option A: oxides mixed in with the filler material

106
Q
A

Option C: amount of heat applied to the work

107
Q
A

Option A: material compatibility

108
Q
A

Option A: the parent (or basis) materials are fully fused together

109
Q

Module 7 . 15. 1
Q 33 Solder will only adhere to: -

(a) clean metal.
(b) smooth metal.
(c) rough metal.

A

(a) clean metal.

110
Q

Module 7 . 15. 1
Q 34 General purpose solders are an alloy of: -

(a) rosin, tin and lead.
(b) tin, soft iron and lead.
(c) tin and lead.

A

(c) tin and lead.

111
Q

Module 7 . 15. 1
Q 35 A good liquid cleaner used for preparation of a soldered joint is: -

(a) petrol.
(b) paraffin.
(c) trichlorethylene.

A

(c) trichlorethylene.

Module 7: Maintenance Practices (B1) (20 decks)

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