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Sheet Metal 2nd Yr > Round Fitting Fab > Flashcards

Round Fitting Fab Flashcards

Try not to get fucked.

1
Q

To brake a transitional brake on an elbow, the amount of angle is measured with a protactor.

TRUE or FALSE

A

FALSE

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2
Q

Why must s Slip and Drive joint be adjusted on transitional fittings?

A

The 1” S-cleat CANNOT be at an angle to the next fitting.

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3
Q

Why do we leave the gore sections together for rolling?

A

Avoid rolling the pieces to different curvatures

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4
Q

When devloping the piece for a 2 side flat transition, what should determine which sloped side gets to pocket allowance and WHY?

A

The side that has the most amount of slope.

Because there is less angle for transfer of angle notch.

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5
Q

When assembling a transitional fitting, what should be done before assembly?

A
  • Forming seams and edges
  • Open Pittsburgh Locks
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6
Q

Why is the use of transitional fittings avoided?

A
  • Time
  • Money
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7
Q

What should you do to the metal of the body before folding the hooks for the grooved seam?

A

Before folding the hooks for the grooved seam, the ends of the material should be pre-rolled slightly so that the pipe ends up round with no flat spots at the seam.

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8
Q

What is the 2 pruposes of a Bead Seam on round pipe?

A
  • As a stop to keep the big end of the next pipe from sliding down too far
  • Strengthening and stiffening the pipes
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9
Q

Define Transitional Fitting

A

A fiiting that changes size of both dimensions.

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10
Q

How should the small end of a round project be identified?

A

The best way to identify the small end is with a small end notch.

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11
Q

What can be done to remove the possibility of the grooved seam collapsing?

A
  • Center punch the seam at the bead
  • Spot weld the seam at the bead
  • Put a rivit throught the greooved seam at the bead
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12
Q

Why are Offset fittings used instead of 2 Elbows?

A

The Offset is used to move the duct line over a specific amount.

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13
Q

What are the measurements necessary to choose a pattern for an elbow?

A
  • Opening Size
  • Throat Radius
  • Elbow Angle
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14
Q

Descride the notch used on the spot welded lap elbow or offset.

A

The notch is the removal of material where the 2 lap allowances over lap.

It is basically a square notch, with a slight relief on the longitudinal seam allowance

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15
Q

What is used to indicate weld type on the blueprint?

A

Welding symbols

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16
Q

Are round elbows laid out with a large end and a small end?

TRUE or FALSE

A

TRUE

They are laided out with a large end and a small end.

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17
Q

Why do we try to make the duct ratio as low as possible?

A

With a low ratio of lenght to width moves air more efficiently than large ratio.

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18
Q

Why is it necessary to number the plan views and the patterns properly?

A

If the element lines in both views are not numbered correctly, the miter line will not be correct.

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19
Q

What causes porosity?

A

Contamination of the weld

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20
Q

Testing to see if a pipe is the correct size should be done when?

A

After the completing the longitudinal seam.

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21
Q

If a transtional fitting is not possible to use, what are your options?

A
  1. Change the duct size to something equivalent that does not require a transitional fitting.
  2. Accomplish the transition in 2 fittings. This is not recommended in medium to high high pressure systems do to turbulence, noise and pressure drop.
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22
Q

The strechout length of a heel runner should be determined by which method.

  • Calculated
  • Measured
A

Calculated

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23
Q

Pattern development in the shop differs from the Pattern Development room only in the tools used.

TRUE or FALSE

A

TRUE

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24
Q

welding a tee joint, a lap joint, and the inside of a corner joint all require the _______ weld type

A

Fillet

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25
Q

What is the formula to calculate the stretch-out of the cylinder?

A

3.14 (pie) X diameter of the cylinder

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26
Q

Why would blocking be used when assembling a transitional fitting with raw edges?

A

To keep the assembly edge flat and not damaged the fitting.

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27
Q

When developing the pattern on piece of metal that has been pre-cut to length, the opening sizes and offsets are placed ________.

A

When developing the pattern on piece of metal that has been pre-cut to length, the opening sizes and offsets are placed ON THE NET PATTERN LINE.

28
Q

Define : Small End of the Elbow

A

Is one pattern seam lenght plus the lap seam allowance.

29
Q

What would the layour look like for a Angle Notch on a Pittsburgh allowance?

30
Q

Define : Centre Sections of the Elbow

A

Is the pattern seam lenghts high and a circumferential lap seam allowance.

31
Q

Is the Miter Angle the same for all Offsets?

TRUE or FALSE

A

FALSE

The miter angle is not the same for all offsets.

32
Q

The pattern needs to be devoled on the same piece of material as the view.

TRUE or FALSE

33
Q

List 3 joints used to join transitional fittings to each other.

A
  • Slip and Drive Connection
  • CP Connection
  • Proprietary Connection
34
Q

What must be developed first when developing the checks for a curved runner pattern?

A

The flat view or pattern.

35
Q

A rotary machine used to offset the lap seam with specific rolls installed is called what type of machine?

A

Burring Machine

36
Q

What does GMAW stand for?

A

Gas metal arc welding

37
Q

What GMAW process is used for sheet metal work?

A

Short circuit.

38
Q

The longitudeinal allowance on an elbow could be what types of seams?

A
  • Lap Seam
  • Grooved Seam
  • Offset Lap Seam
39
Q

Why is Notching necessary?

A

It is very important that the multiple layers of metal are removed from any location where the metal forming equipment may come in contact with the seam. If this metal is not removed, the equipment may damage it.

40
Q

State the formula for small end allowance?

A

Small End Allowance = 7 X (material thickness)

41
Q

That are different types of seams manufactured on round fittings.

List 3 types of seams used on round fittings.

A
  1. Lap and Offset Lap
  2. Grooved Seams
  3. Elbow Seams
42
Q

What is the formula to calculate the mitter angle of an elbow?

A

total Angle*

Miter Angle = ——————–

(# of Pieces X 2) - 2

43
Q

What is considered the most serious weld defect?

A

Cracking, as it can lead to complete weld failure.

44
Q

What must be done to the net pattern for each proprietary connection?

A

Reduce the lenght of the net pattern by the length of the proprietary connection.

45
Q

What are the five (5) basic joints?

A

Butt, Lap, Corner, Edge and tee or fillet

46
Q

Where do you start assembling the gore sections?

A

At the Small End

47
Q

Define Large End of the Elbow

A

Does not have a circumferential lap seam allowance added to it.

48
Q

Why is it important to lay out all patterns as inside patterns?

A

Inside patterns will place allthe scribe lines inside the fitting.

49
Q

What must be done to the net pattern for each slip and drive joint connection?

A

Reduce length of the net pattern by 1”

50
Q

What is the recommended setting for shielding gas?

51
Q

Once the pattern is cut out and true, it should have what measurement labeled on it?

A
  • Opening Size
  • Miter Angle
  • Throat Radius
52
Q

When are transitional fittings used?

A
  • To change the duct size to accommodate a reduction/increase in airflow.
  • To move duct for architectural reasons
53
Q

Why would the throat and heel be fastened to one cheek instead of fastening both cheeks to either the throat or the heel

A

The throat or heel can help support the cheek during assmbly.

54
Q

When cutting the hole in the body, you should cut directly on the cut line.

TRUE or FALSE

55
Q

What are the two(2) different angels involved in welding regrading the electrode to work angles?

A

Work (transverse) angle and travel (longitudinal) angle

56
Q

How are sheet metal round pipe tees identified?

A

By the Angle and the Diameter of the stub

then diameter of the body.

Exsample : 90* angle,4 “ on 6”

57
Q

All GMAW processes need shielding gas. A) True B) False

58
Q

Why is it a good idea to start spot welding at the center of the lap seam?

A

This will eliminate bulging and bucking between spot welds.

59
Q

The crimp should be used to change the diameter of the pipe.

TRUE or FALSE

A

FALSE

Layout procedures should be used to change the diameter of the pipe

60
Q

Seams that travel the length of the fitting are called what?

A

Longitudinal Seams

61
Q

What effect does changing the wire speed have on the voltage or amperage of the welding process?

A

increased wire speed requires increased amperage. Voltage is not affected.

62
Q

How is the type of seam determined?

A

By pressure class and the material thickness of the ducting system

63
Q

What is the mathematical concept is used when building transitions from plan view?

A

Pythagorean Theorem

64
Q

What is the recommended order of assembly for a transitional fitting?

A
  1. Flat Side Down, if no flat side then the side with the greatest amount of slope.
  2. Throat
  3. Heel
  4. Other Cheek
65
Q

Does the Offset only need the first gore section developed?

TRUE or FALSE

66
Q

What are the methods that can be used to divide the stretchout on the round stub?

A
  • Dividers
  • Slope Line Method
  • Mathematically
67
Q

What weld defect is common to the GMAW process?

A

Whiskers (man eaters)

Sheet Metal 2nd Yr (7 decks)

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