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2nd year sheet metal > Shop theory > Flashcards

Shop theory Flashcards

1
Q

Lap seam allowance?

A

1W

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2
Q

Groove seam allowance?

A

3W

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3
Q

Hammerlock allowance?

A

3W

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4
Q

What type of seam is an elbow seam?

A

Circumferential

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5
Q

Allowance for a female pittsburg?

A

15/16”

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6
Q

Male pittsburg allowance?

A

1/4”

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7
Q

Formula for stretchout?

A

Diameter x 3.14

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8
Q

What is the purpose for the bead on a pipe?

A

Add strength and as a stop for the pipe connected to it

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9
Q

What type of seam travels the length of the fitting?

A

Longitudinal

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10
Q

Formula for small end?

A

Minus 7MT

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11
Q

How is small end identified?

A

With a notch

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12
Q

What allowance is added to the net pattern for a slip and drive connection?

A

1/2”

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13
Q

Ideal length to width ratio for duct?

A

1 to 1

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14
Q

To what standard is ductwork constructed?

A

SMACNA

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15
Q

How many views are required to develop the mitre line on a round tee?

A

2

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16
Q

In which direction should you follow when resistance welding?

A

Outward to avoid bulging and buckling

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17
Q

What is a crimp used for on a pipe?

A

Aid in the joining of fittings

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18
Q

The pitch between fasteners is?

A

The spacing

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19
Q

The 3 methods used to divide a stretchout into 12 equal spaces?

A

Sloped rule, using dividers and mathematically

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20
Q

What is done to a fish pattern to ensure it is perfect or true?

A

Truing up the pattern

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21
Q

What is used on a pattern to ensure it finishes at the correct angle?

A

Centreline

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22
Q

How is the type of seam to be used, determined on a fitting?

A

Material thickness and pressure class

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23
Q

How many methods are there to developing an offset?

A

4

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24
Q

Name 3 measurements that are required to develop an elbow?

A

Throat radius, opening (diameter) and mitre angle

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25
Q

What is the throat radius dimension on a full throat 4” 90?

A

4”

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26
Q

What is the centreline radius dimension on a full throat 5” 90?

A

7 1/2”

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27
Q

What are the sections of an elbow called?

A

Gores

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28
Q

How many patterns are required to lay out a 5 piece, 90?

A

1

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29
Q

What must be considered when laying out and fabricating a 90 degree elbow?

A

Airflow

30
Q

Name 2 turning machines that can produce an offset circumferential lap seam?

A

Offset lap and burring

31
Q

What 3 dimensions must be known before developing the elevation view of a round offset?

A

Offset amount, opening size and vertical height

32
Q

What is the stretchout for a 4” 90?

A

12 9/16”

33
Q

What is the cut or blank size for a 5” SE with a 1/2” lap seam x 48” H?

A

16” x 48”

34
Q

What is the cut or blank size for a 7” SE with a 1/4” groove seam x 24” H?

A

22 9/16” x 24”

35
Q

What seam travels around a fitting?

A

Circumferential

36
Q

What fitting is used to join spiral pipe?

A

Beaded sleeve joint, coupler, connecting collar

37
Q

Which 90 is better for airflow-2 piece or a 5 piece?

A

5

38
Q

Which notch removes material that may come in contact with a Pittsburg connection?

A

Transfer of angle notch

39
Q

The formula for developing the mitre angle can only be used on 90 degree elbows, true or false?

A

False

40
Q

Up to what distance are light rays dangerous?

A

50’

41
Q

All compressed gas cylinders must have what type of label?

A

WHMIS

42
Q

Welding lenses will protect your eyes from what percentage of harmful rays emitted during the welding process?

A

99%

43
Q

3 components necessary for a fire?

A

Heat, fuel, oxygen

44
Q

What is the maximum safe working pressure for acetylene gas?

A

15 psi

45
Q

3 basic modes of metal transfer with gas metal arc welding?

A

Spray transfer, short circuit and globular

46
Q

3 types of drive systems in GMAW

A

Push, pull, push pull

47
Q

What is the primary function of the shielding gas when MIG welding?

A

Protect weld from atmospheric contamination

48
Q

Flow rate for CO2 and Argon?

A

20 CFH

49
Q

What can happen to a weld if travel speed is excessive?

A

Porosity

50
Q

Why would you use blinds, screens or shields when welding?

A

Protect other people

51
Q

When are transitional fittings used?

A

When duct size changes are necessary

52
Q

What does FOB refer to?

A

Flat on back (bottom)

53
Q

If duct is to have a raw connection, how much allowance is added to the length?

A

No allowance is added

54
Q

What do you call a pattern that has allowances added to it?

A

Gross pattern

55
Q

What do you call a pattern that has no allowances added to it?

A

Net pattern

56
Q

What method can be used to calculate the length of a side rather than measuring off a pattern?

A

Pythagoras theorem

57
Q

When cutting the hole in the body of a pipe tee, you should cut directly on the line you traced, true or false?

A

False

58
Q

After laying out a pattern, what should be done prior to cutting it out?

A

Label airflow direction, number of pieces and centreline

59
Q

Why are gore sections left together when rolled?

A

To ensure all pieces have the same curvature

60
Q

True or false-an offset only needs the first gore developed?

A

False

61
Q

Name 3 types of light rays when MIG welding?

A

Ultraviolet, infrared and invisible light

62
Q

What does GMAW stand for?

A

Gas metal arc welding

63
Q

Best type of clothing to protect yourself when MIG welding?

A

Leather

64
Q

What is used to indicate weld style on a blueprint?

A

Welding symbols

65
Q

Name 3 types of malfunctions with oxyfuel equipment?

A

Backfire, flash back, burn back

66
Q

What type of hammer is used to stretch the flange on a tee stub?

A

Riveting hammer

67
Q

When welding, what controls the current?

A

Wire speed

68
Q

What will change if the wire speed is increased when welding?

A

Amps

69
Q

When assembling the sections of an elbow, in which direction should the gores be put together?

A

From SE (small end) to BE (big end)

70
Q

What is the bevel on a welded pipe used for?

A

Root weld

71
Q

What turning machine is used for making round pipe?

A

The adjustable slip rolls

2nd year sheet metal (5 decks)

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