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Sheet Metal Red Seal > Shop/ PD > Flashcards

Shop/ PD Flashcards

1
Q

Minimum OG length

A

Minimum 2x offset, 3x preferred

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2
Q

What is a constant current welding machine ?

A

SMAW OR GTAW

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3
Q

DCEP

A

Reverse Polarity - direct current electrode positive, slower weld speed, deeper penetration, good for heavy gauge

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4
Q

DCEN

A

Straight Polarity - faster, shallow penetration, good for light metal

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5
Q

Double hem Allowance

A

2W minus 1/16

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6
Q

Groove seam allowance

A

3W (1.5for each side **)

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7
Q

Difference between hot rolled and cold rolled steel?

A

Hot rolled is lower grade and not as hard as cold rolled

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8
Q

How is copper gauged

A

Oz per square foot

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9
Q

Mild steel has a _____ carbon content?

A

Low

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10
Q

10gauge metal is how thick?

A

1/8th

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11
Q

16 gauge metal is ?

A

1/6 thick ( 6 gauges is half thickness)

(Not sure on this one) need to be confirmed

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12
Q

Type of aluminum most used in architectural sheet metal work is called?

A

Half hard

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13
Q

Ferrous metals are gauged using ?

A

Standard gauge

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14
Q

Most aluminum has what type of finish?

A

Mill

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15
Q

Metals thicker than 1/4 are called?

A

Plate

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16
Q

Process that builds natural oxide on aluminum?

A

Anodizing

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17
Q

Copper is used for intricate work because?

A

It’s very malleable

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18
Q

A metal that is used to strengthen steel? Chemically non reactive and not affected by most acids

A

Molybdenum

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19
Q

Most commonly used screen in sheet metal shop?

A

Hardware cloth (bird screen)

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20
Q

To prevent exposure or contact with DC current when using plasma table, operator must make sure that ?

A

Nozzle in place
Safety sensor in place

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21
Q

Good rule of thumb, choose a machine class that is how many times your typical cutting thickness

A

Two times

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22
Q

Plasma nozzles are sized according to?

A

Amperage

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23
Q

How to find Kerf compensation values?

A

Trial and error

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24
Q

Best indicator of worn or misaligned parts in torch head ?

A

Concave cut on one side and convex cut on other side

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25
Q

Slow cutting speed will produce ?
Fast cutting speed will produce?

A

Slow - vertical lag lines
Fast - slanted s shaped lag lines

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26
Q

Molten leftover from plasma cutting ?

A

Dross

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27
Q

Two main requirements for plasma machine?

A

Ac power and compressed air

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28
Q

What views are necessary for developing on center square to rounds?

A

Just a Plan view

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29
Q

When would you need more than twelve point spacing in round?

A

Fitting over 12” round

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30
Q

First step for groove seam?

A

Not hand groover

Dress the hook material down to 4 metal thickness using smooth hammer

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31
Q

When folding for groove seam you should always?

A

Fold slightly less than nominal size

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32
Q

What device controls the motorized zone damper ?

A

Central control panel

33
Q

Drill bit angle for mild steel?
Stainless ?

A

118 Mild steel
130-140 SS

34
Q

What method of power breaking should be used when bending SS?

A

Air bending

35
Q

Can SS be soldered?

A

Yes

36
Q

Silver brazing is a form of _____

A

Hard solder

37
Q

What settings must be adjusted before spot welding SS

A

Increase pressure , decrease current

38
Q

Finishing SS procedure?

A

Grind, sand, polish, buff

39
Q

What is a turning machine used for?

A

Forms pocket for wired edge

40
Q

Wiring machine is used for?

A

Turn the edge and close a wired edge pocket

41
Q

What type of stake is E?

What type of stake is E?
A

Beakhorn

42
Q

The metric system is also known as what

A

System international (SI)

43
Q

1 ton is equal to how many KG?

A

1000KG

44
Q

Another name for hammer lock?

A

Clinch lock

45
Q

Net vs gross pattern

A

Net is without allowance
Gross is with allowance

46
Q

Which Seam would you use to attach around collar to a square to round body

A

Elbow seam

47
Q

Centre line radius for HVAC elbows vs blow pipe elbow

A

1&1/2 for HVAC vs 2&1/2 w centreline blowpipe (width of duct)

48
Q

Radial line PD can be described as

A

Start from a vertex

49
Q

What fittings developed from radial line?

A

Cone flashing, tall cone, tapering cones, reducer, increaser

50
Q

Radius on gooseneck ?

A

1/2 W

51
Q

Gooseneck and roof ventilator height

A

18”

52
Q

Rain cap diameter

A

2x pipe it’s attached too

53
Q

Gap from rain cap to pipe

A

1/2 W of pipe

54
Q

Angle of rain cap

A

30 degree

55
Q

Spacing between fasteners on round vs straight objects

A

Straight will have one less - 8 fasteners 7 spaces
Round will have same number - 8 spaces 8 fastner

56
Q

What must be in place for a brake to work at full capacity ?

A

Angle bar
-If angle bar is removed reduce 4 gauges
-If insert bar is removed reduce 7 gauges

57
Q

What must you do if your metal thickness is within 4 gauges of break rating

A

Move nose back 2 metal thickness

58
Q

What is a trammel point

A

Beam compass

59
Q

Gauge for ferrous metal?
Non ferrous ?

A

Ferrous- Us standard
Non ferrous - Brown and sharp (american standard wire gauge)

60
Q

Another name for duckbill snips?

A

Combination snips

61
Q

Best tool to transfer pattern into sheet metal

A

Prick punch

62
Q

Files are classified by

A

Length, shape, cut

63
Q

Use a hand groover that is

A

1/16 bigger than your groove seam

64
Q

Brittleness

A

Ability to withstand distortion

65
Q

Ductility

A

Ability to withstand stretching, bending, twisting

66
Q

Elasticity

A

Tendancy of metal to return to original form

67
Q

Hardness

A

Ability to resist forces, resists penetration

68
Q

Malleability

A

Ability to withstand mechanical processing such as rolling

69
Q

Strength

A

Amount of high steady stress metal can handle, SS is strong

70
Q

Toughness

A

Opposite of brittleness, ability to withstand impact

71
Q

Least noble ?
Most noble?

A

Least - aluminum
Most - SS 300 series then bronze then copper

72
Q

Brass is

A

Copper and zinc

73
Q

Bronze

A

Copper and tin

74
Q

Mig uses ____ on mild steel

A

DCEP reverse polarity

75
Q

Orthographic projection

A

Taking an isometric drawing and having three sides drawn

76
Q

When would you use spray transfer type welding?

A

Mig welding aluminum, 85% argon

77
Q

What flux is used for galvanized

A

Muriatic acid

78
Q

How do you seal a copper roof?

A

Solder

79
Q

What type of stake is this?

A

Conductor

Sheet Metal Red Seal (6 decks)

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