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Sheet Metal 4th Year > Shop And Welding > Flashcards

Shop And Welding Flashcards

1
Q

Power press brakes can either be?

A

Mechanical or hydraulic

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2
Q

All power press brakes are rated in?

A

Tons

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3
Q

If you are using a 120 ton brake that measures 10’ in length, how many tons of braking power do you have per foot?

A

12 tons per foot

120 / 10 = 12

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4
Q

What is the amount of travel of the moving beam and is adjustable on press brakes?

A

Stroke length

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5
Q

What is the distance between the lower surface of the top beam and the upper surface of the bottom beam when the moveable beam is at its maximum stroke length with no dies in place?

A

Opening height

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6
Q

What is the distance from the left side to the right side of the brake tooling?

A

Overall length

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7
Q

What is used in certain types of hydraulic press brakes to ensure the stopping of the ram at the same position?

A

Mechanical stops

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8
Q

Name three types of bending on a power press brake?

A

Coining -stamping
Bottom bending
Air bending

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9
Q

When the material is expected to take its shape from the amount of depth penetration of the punch, this is known as?

A

Air bending

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10
Q

Which form of bending requires the least amount of pressure?

A

Air bending

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11
Q

What must you do to the thickness of the metal when using inside dimensions?

A

Add 20%

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12
Q

To calculate outside dimensions, what do you need to do to the thickness of the metal you are working with?

A

Subtract 80%

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13
Q

What is the name of the upper bending tool on a power brake?

The lower bending tool?

A

Upper is punch

Bottom is die

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14
Q

What die can be used to straighten out material that has been formed incorrectly?

A

Flattening die

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15
Q

What are 2 disadvantages of working with rubber dies?

A

They deteriorate much faster

They have a high replacement cost

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16
Q

What type of die can be used if a quality finish is desired?

A

Roll form or rotator dies

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17
Q

Which is the most accurate method of bending?

A

Coining

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18
Q

Which method of bending produces sharp corners with consistent accuracy?

A

Bottom bending

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19
Q

How many times the material thickness should the die opening be when air bending material up to and including 1/2” thick?

A

8 times the material thickness

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20
Q

How many times the material thickness should the die opening be if you are air bending material over 1/2” thick?

A

10 times the material thickness

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21
Q

What can be done to ensure the most accurate method to determine bend allowance?

A

Test piece

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22
Q

What is the biggest disadvantage of air bending?

A

Inconsistency of the bends due to the variation of metal thickness and structure as it comes from the mill

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23
Q

Is it ok to bend material using numbers above the bolded numbers on a tonnage chart?

A

It is dangerous and will cause unsafe pressures

24
Q

Is it acceptable to remove the guards on a power shear?

A

No

25
Q

Two design types of power squaring shears are?

A

Guillotine (slider)

Swing beam

26
Q

Power shears are electrically run with the motor being of what two type of systems?

A

Hydraulic or mechanical

27
Q

Power shears can cut from what gauge to material in excess of what?

A

From 30 gauge to in excess of 1/4” plate steel

28
Q

When using a shear, stainless steel reduces the shear’s capacity by how many gauges?

A

4 gauges

29
Q

Guillotine type shears require a what to keep the blade beams in the proper position?

A

Guiding system

30
Q

What can be adjusted on a guillotine type machine to suit the length of the part that is being cut?

A

The rake angle

31
Q

Good cuts cannot be expected on a strip that is smaller than how many times the material thickness?

A

8 times

32
Q

How are the blades kept in proper position on a swing beam style shear?

A

A drive system pivots the moving blade down on roller bearings

33
Q

What type of shear only uses power when it is activated?

A

Direct drive mechanical shear

34
Q

Mechanical shears are faster and have a better design for cutting certain types of material. To what gauge and length can they cut?

A

To 10 gauge and 12’

35
Q

What is the flat horizontal portion in front of the shear?

A

The bed

36
Q

What is used on the side of the shear that keeps the material at 90 degrees to the shear knives?

A

Side gauge

37
Q

What part on the shear is adjustable allowing you to make multiple cuts simultaneously and accurately?

A

Back gauge

38
Q

If the shear knives are not kept sharp, what can be left on the material being cut?

A

Burrs

39
Q

The piece that is mounted directly in front of the hold down fingers used to keep you from slipping your hands into the knife area is called what?

A

Knife guards

40
Q

A pedal attached by a cable or running the entire length of the shear is the?

A

Foot treadle

41
Q

What component sets up the length and materials gauge as well as adjusts the back gauge?

A

Control panel

42
Q

What is the angle made between the upper and lower shear knives?

A

Rake angle

43
Q

It is better to have a lower rake angle? True or false

A

True, the cut will be of better quality

44
Q

Distance between the upper and lower shear knives is the?

A

Blade clearance

45
Q

When can the guards on a power shear be removed?

A

Never, they are there for your safety!

46
Q

How much residual pressure at pounds per square inch should remain in a cylinder to avoid atmospheric contamination of its interior?

A

25 psi

47
Q

Name the three basic types of metal transfer methods in GMAW welding?

A

Short circuit transfer
Globular transfer
Spray arc transfer

48
Q

When working with current and voltage in welding, what sets the arc length and what sets the speed?

A

Voltage sets the arc length and wire speed sets the heat

49
Q

If voltage is too low and wire speed is too high what is this referred to as?

A

Stubbing

50
Q

What type of welding does not require a shielding gas?

A

FCAW Flux cored arc welding

51
Q

What is the purpose of the shielding gas?

A

To prevent the weld metal from absorbing elements from atmospheric air

52
Q

What is the thermal conductivity of a gas?

A

It is the gases ability to conduct heat

53
Q

Which gas has the higher thermal conductivity, argon or helium?

A

Helium

54
Q

What type of gas is used to weld aluminum?

A

Argon which is approximately 1.4 times heavier than air

55
Q

What is the typical flow rate for argon-oxygen shielding gas when welding steel?

A

25 CFH (cubic feet per hour)

56
Q

What causes porosity in the weld metal?

A

Moisture

Sheet Metal 4th Year (5 decks)

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