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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
Tension, Shear, Cleverage and Peel
26
Pressure and heat
27
True
28
Copper and silver
29
True
30
Passive
31
True
32
pickled
33
a high resistant joint potential
34
too little heat
35
neutral
36
to dissolve oxides
37
To chemically clean the base metal of oxide film
38
The soldering iron and solder should be applied simultaneously to the connection
39
non-active
40
60^C above the melting point of solder
41
Tin and lead
42
Some dissimilar metals
43
must be cleaned off with a selected solvent
44
components not hot enough
45
standing wave bath method
46
tinned
47
tin / lead / antimony / silver
48
600^C - 850^C
49
helium or argon, or a mixture of helium and argon
50
Type and thickness of the metal to be welded
51
Sides sloping to the base metals
52
copper zinc and silver
53
reduces the strength of the joint
54
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
release the stresses from the material
56
flux
57
The MIG welding process uses an inert gas to protect the weld zone from the atmosphere
58
the penetration should be 100 percent of the thickness of the base metal
59
Oxides mixed in with the filler material
60
Amount of heat applied to the work
61
Material Compatibility
62
the parent (or base) materials are fully fused together
63
Option A: pickled
64
Option B: a high resistance joint potential
65
Option C: too little heat
66
Option C: neutral
67
Option A: to dissolve oxides
68
Option B: D
69
Option C: To chemically clean the base metal of oxide film
70
Option B: the soldering iron and solder should be applied simultaneously to the connection
71
Option B: non-active
72
Option C: 60^C above the melting point of solder
73
Option B: Tin and lead only
74
Option B: a letter coding
75
Option C: wire flux cored solder
76
Option A: some dissimilar metals
77
Option A: dissolve oxides
78
Option C: must be cleaned off with a selected solvent
79
Option B: components not hot enough
80
Option A: It must be immersed in a weak solution of hydrochloric acid and rinsed thoroughly in running water
81
Option C: stainless steel
82
Option C: standing wave bath method
83
Option C: stick solder needing a separate flux and solder in wire form having a rosin core
84
Option C: tinned
85
Option C: tin / lead / antimony / silver
86
Option C: subjected to small forces
87
Option C: 600^C - 850^C
88
Option B: a defect associated with a soldered joint
89
Option B: high temperature applications
90
Option C: copper, zinc and silver
91
Option A: brass and mild steel
92
Option C: Minimises or prevents oxidation
93
Option C: helium or argon, or a mixture of helium and argon
94
Option C: Type and thickness of the metal to be welded
95
Option C: Sides sloping to the base metals
96
Option A: copper zinc and silver
97
Option C: reduces the strength of the joint
98
Option A: prevent oxides from forming ahead of the weld
99
Option B: prevent the formation of oxides in the puddle
100
Option C: release the stresses from the material **Note**: Normalising removes local stresses set up by the heat, and in turn prevents corrosion.
101
Option C: borax powder
102
Option C: flux
103
Option C: The inert-arc welding process uses an inert gas to protect the weld zone from the atmosphere
104
Option A: the penetration should be 100 percent of the thickness of the base metal
105
Option A: oxides mixed in with the filler material
106
Option C: amount of heat applied to the work
107
Option A: material compatibility
108
Option A: the parent (or basis) materials are fully fused together
109
Module 7 . 15. 1 Q 33 Solder will only adhere to: - (a) clean metal. (b) smooth metal. (c) rough metal.
(a) clean metal.
110
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.
(c) tin and lead.
111
Module 7 . 15. 1 Q 35 A good liquid cleaner used for preparation of a soldered joint is: - (a) petrol. (b) paraffin. (c) trichlorethylene.
(c) trichlorethylene.

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

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