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Pipefitting Term 1 > Soldering and Brazing > Flashcards

Soldering and Brazing Flashcards

1
Q

T or F - Coper is a non-ferrous metal

A

True

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2
Q

T or F - ACR copper tubing does not need to be kept plugged or capped.

A

False

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3
Q

T or F - Brass is an elemant listed on the Periodic Tables

A

False

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4
Q

The outside diameter of copper tube types K, L and M are the same

A

True

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5
Q

Cup-joint drainage fittings may be used on pressure piping systems

A

False

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6
Q

Solder and brazed joints are not recommended for soft temper copper tube

A

False

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7
Q

Brass is an alloy of Copper and Zinc

A

True

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8
Q

Never secure a gas cylinder to a conduit carrying

A

electric current

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9
Q

The suggested shade number for filter lenses for torch brazing is

A

4

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10
Q

The suggested shade number for filter lenses for torch soldering is

A

2

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11
Q

The most common type joints for connecting copper tube are?

A

soldered and brazed

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12
Q

What is the max service temperature for copper tube when soldered joints are used?

A

250 F

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13
Q

The flow of a liquid when it is drawn into a small space between wet surfaces is?

A

capillary action

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14
Q

A material or substance made up of two or more elements, at least one of which is a metal, is a/an?

A

Compound

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15
Q

The size of ACR copper tube is designated by?

A

Actual outside diameter

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16
Q

How is the size of copper water tube designated

A

by its nominal inside diameter

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17
Q

Which of the 3 types of copper water tube has the heaviest wall thickness?

A

K

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18
Q

DWV copper wall thickness is __ than Type M

A

less than

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19
Q

If you ran out of 5/8” OD ACR fittings on a job what size water tube fitting could you use?

A

1/2”

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20
Q

Why is it recommended that flux be applied to copper as soon as possible after cleaning?

A

prevent oxidation

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21
Q

After fittings are cleaned and fluxed, they should be assembled and soldered:

A

asap

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22
Q

Which torch valve should be closed first, oxygen or acetylene, when a flashback occurs?

A

oxygen

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23
Q

Overheating a joint when brazing a wrought copper fitting causes

A

oxidation and distortion of the joint

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24
Q

Soldering is done at what temperature?

A

under 840 degrees

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25
Q

Brazing is done at what temperature?

A

above 840 degrees

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26
Q

True or False - Brazing has a higher melting/pasty range than soldering

A

True

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27
Q

What are the 2 classes of brazing filler metals suitable for joining copper?

A

BAg and BCuP

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28
Q

Solders have a ____ instead of a melting point

A

melting range

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29
Q

Name one disadvantage of using tin-silver solders

A

high cost

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30
Q

What are the primary advantages of tine-silver solder

A

easy to use and filleting ability

31
Q

Brazing filler metal is used to designate a brazing alloy which has a melting temp exceeding

A

1100 degrees F

32
Q

Define Alloy

A

a substance made up of 2 or more metals

33
Q

The 2 classes of brazing filler metals differ in their

A

melting, fluxing and flowing characteristics

34
Q

The most widely used solders for making solders joints on copper tube are ___ and ___

A

50/50 tin lead and 95/5 tin antimony

35
Q

Why are new lead free solder considered easy to work with?

A

It has a low initial melting point and wide melting range

36
Q

Of the 2 classes of brazing filler metal which one is more economical and why?

A

BCuP - because it has lower silver content

37
Q

When using solder-flux what 3 rules should be observed

A
  1. Dont depend on the flux to clean the tube.
  2. wire solder must be added to the joint to fill the voids
  3. the paste mixture must be thoroughly stirred before using
38
Q

True or False - heat has no effect on the rate of oxidation of metal

A

false

39
Q

True or False - Brazing fluxes are generally stronger than soldering fluxes

A

true

40
Q

____ or ___ on the high pressure side of an oxygen cylinder can cause an explosion

A

Oil, Grease

41
Q

Name 4 types of copper tube joints

A

Soldered
Brazed
Flared
Compression

42
Q

What is the difference between soldering and brazing?

A

Temperature -
Soldering: below 840 degree
Brazing: above 840 degrees

43
Q

Is it possible to weld copper tube?

A

Yes - butt welded

44
Q

When soldering, is it necessary to use a non-ferrous filler metal which has a melting point below that of the base metal?

A

Yes

45
Q

What is the max service temperature for copper tube when brazed joints are used?

A

350 degrees F

46
Q

The most common method of joining copper tube is with the use of ___ fittings

A

cup joint

47
Q

T or F - Flared joints are often used for connecting underground lines

A

True

48
Q

Name the types of Copper tube

A

K,L,M & DWV

49
Q

What are the 3 general classified groups for fluxes?

A
  1. Highly corrosive
  2. Intermediate
  3. Non-corrosive
50
Q

What are the ingredients of the most common fluxes for soldered joints in copper tube?

A

zinc chloride and/or ammonium chloride

51
Q

Which solder melts at the higher temperature, 50-50 or 95-5

A

95-5

52
Q

True or False - Joint preparations for soldering and brazing are two different procedures?

A

False

53
Q

What are the 3 most common sources of heat used for soldering or brazing copper tube joints

A
  1. Air propane
  2. Air acetylene
  3. Oxyacetylene
54
Q

An Air-acetylene flame produces a ______ amount of heat than an air-propane flame

A

Greater

55
Q

An excess of acetylene in an oxyacetylene flame will give a ___ flame

A

carburizing

56
Q

When making a soldered joint using cast fittings, name 2 things which could cause the fitting to crack

A
  1. wiping

2. quenching

57
Q

Flux may be omitted when joining copper tube to wrought copper fittings with ___ alloys because they are self-fluxing on copper.

A

BCuP series

58
Q

When heated, 95/5 tin-antimony solder begins to melt at a temperature of ___ºF and becomes a liquid at 464ºF.

A

452

59
Q

T or F - When brazing with a copper tube, wrought copper fittings, and BCuP brazing filler metal, fluxing is optional.

A

T

60
Q

Unsoldered areas may be the result of improper cleaning, fluxing, or heating if the surface is ________________.

A

dry

61
Q

A perfectly soldered joint will show the entire cup area of the fitting to be completely covered with ________________, which will have a grayish surface

A

solder

62
Q

When brazing copper tube to wrought copper fittings, a(n) ________________ filler metal may be successfully used without the use of flux

A

BCuP

63
Q

T or F - Where corrosion is a factor, cadmium-free filler metals of the BCuP classification that contain nickel are best suited.

A

F

64
Q

T or F - Brazed joints, with cup-joint fittings, are used where greater strength is required or where system operating temperatures are as high as 250ºF.

A

F

65
Q

T or F - Because of the thinness of its wall, copper tube is not normally threaded.

A

T

66
Q

T or F - It is not possible to use the tube of one manufacturer with the fittings of another manufacturer without any installation problems.

A

F

67
Q

T or F - Copper-to-copper joints shall be made using a copper-phosphorus brazing filler metal without flux.

A

T

68
Q

When a non-ferrous filler metal is applied, but is not distributed in the joint by capillary action, it is called _______.

A

braze- welding

69
Q

T or F - Since the high-temperature would destroy the color marking of a tube if applied, hard temper tube is not color marked.

A

F

70
Q

T or F - Since the high-temperature would destroy the color marking of a tube if applied, hard temper tube is not color marked.

A

False

71
Q

Types K, L and M tube are designated by standard (nominal) sizes ___.

A

1/4” to 12”

72
Q

Type K copper tube is color coded ________________ to distinguish it from other types of copper tube.

A

green

73
Q

True or False - It is not possible to use the tube of one manufacturer with the fittings of another manufacturer without any installation problems.

A

F

Pipefitting Term 1 (5 decks)

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