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Sheet Metal Red Seal > Shop/ PD > Flashcards

Shop/ PD Flashcards

(79 cards)

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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
Slow cutting speed will produce ? Fast cutting speed will produce?
Slow - vertical lag lines Fast - slanted s shaped lag lines
26
Molten leftover from plasma cutting ?
Dross
27
Two main requirements for plasma machine?
Ac power and compressed air
28
What views are necessary for developing on center square to rounds?
Just a Plan view
29
When would you need more than twelve point spacing in round?
Fitting over 12" round
30
First step for groove seam?
Not hand groover Dress the hook material down to 4 metal thickness using smooth hammer
31
When folding for groove seam you should always?
Fold slightly less than nominal size
32
What device controls the motorized zone damper ?
Central control panel
33
Drill bit angle for mild steel? Stainless ?
118 Mild steel 130-140 SS
34
What method of power breaking should be used when bending SS?
Air bending
35
Can SS be soldered?
Yes
36
Silver brazing is a form of _____
Hard solder
37
What settings must be adjusted before spot welding SS
Increase pressure , decrease current
38
Finishing SS procedure?
Grind, sand, polish, buff
39
What is a turning machine used for?
Forms pocket for wired edge
40
Wiring machine is used for?
Turn the edge and close a wired edge pocket
41
What type of stake is E?
Beakhorn
42
The metric system is also known as what
System international (SI)
43
1 ton is equal to how many KG?
1000KG
44
Another name for hammer lock?
Clinch lock
45
Net vs gross pattern
Net is without allowance Gross is with allowance
46
Which Seam would you use to attach around collar to a square to round body
Elbow seam
47
Centre line radius for HVAC elbows vs blow pipe elbow
1&1/2 for HVAC vs 2&1/2 w centreline blowpipe (width of duct)
48
Radial line PD can be described as
Start from a vertex
49
What fittings developed from radial line?
Cone flashing, tall cone, tapering cones, reducer, increaser
50
Radius on gooseneck ?
1/2 W
51
Gooseneck and roof ventilator height
18"
52
Rain cap diameter
2x pipe it's attached too
53
Gap from rain cap to pipe
1/2 W of pipe
54
Angle of rain cap
30 degree
55
Spacing between fasteners on round vs straight objects
Straight will have one less - 8 fasteners 7 spaces Round will have same number - 8 spaces 8 fastner
56
What must be in place for a brake to work at full capacity ?
Angle bar -If angle bar is removed reduce 4 gauges -If insert bar is removed reduce 7 gauges
57
What must you do if your metal thickness is within 4 gauges of break rating
Move nose back 2 metal thickness
58
What is a trammel point
Beam compass
59
Gauge for ferrous metal? Non ferrous ?
Ferrous- Us standard Non ferrous - Brown and sharp (american standard wire gauge)
60
Another name for duckbill snips?
Combination snips
61
Best tool to transfer pattern into sheet metal
Prick punch
62
Files are classified by
Length, shape, cut
63
Use a hand groover that is
1/16 bigger than your groove seam
64
Brittleness
Ability to withstand distortion
65
Ductility
Ability to withstand stretching, bending, twisting
66
Elasticity
Tendancy of metal to return to original form
67
Hardness
Ability to resist forces, resists penetration
68
Malleability
Ability to withstand mechanical processing such as rolling
69
Strength
Amount of high steady stress metal can handle, SS is strong
70
Toughness
Opposite of brittleness, ability to withstand impact
71
Least noble ? Most noble?
Least - aluminum Most - SS 300 series then bronze then copper
72
Brass is
Copper and zinc
73
Bronze
Copper and tin
74
Mig uses ____ on mild steel
DCEP reverse polarity
75
Orthographic projection
Taking an isometric drawing and having three sides drawn
76
When would you use spray transfer type welding?
Mig welding aluminum, 85% argon
77
What flux is used for galvanized
Muriatic acid
78
How do you seal a copper roof?
Solder
79
What type of stake is this?
Conductor

Sheet Metal Red Seal (6 decks)

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