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Sheet Metal 4th Yr > Custom Metal Fabrication > Flashcards

Custom Metal Fabrication Flashcards

1
Q

SPECIALTY GMAW AND MIG WELDING

What is the most common metal transfer when welding base metal that is made of coated steel or stainless?

A

Short Circuit Transfer

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2
Q

SPECIALTY GMAW AND MIG WELDING

What does GMAW stand for?

A

Gas Metal Arc Welding

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3
Q

SPECIALTY GMAW AND MIG WELDING

What GMAW process is used most for sheet metal work?

A

Short Circuit Transfer

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4
Q

SPECIALTY GMAW AND MIG WELDING

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

A
  1. The current vaties with the amount of wire speed
  2. The current increases in proportion to the wire speed
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5
Q

SPECIALTY GMAW AND MIG WELDING

Which organizations have written specifications for GMAW filler metals?

A
  1. AWS
  2. CSA
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6
Q

SPECIALTY GMAW AND MIG WELDING

When using GMAW on mild steel with carbon dioxide sheilding, which type of filler wire should be selected?

A

Deoxidized Wire

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7
Q

SPECIALTY GMAW AND MIG WELDING

When wires are packaged in sealed containers, from what are we protecting them from?

A

Moisture Contamination

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8
Q

SPECIALTY GMAW AND MIG WELDING

Improperly stored wires most often produce welds with which defect?

A

Porosity

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9
Q

SPECIALTY GMAW AND MIG WELDING

Filler metals containing additional deoxidizers are intended for use which metals?

A

Moderately rusty low-carbon steels

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10
Q

SPECIALTY GMAW AND MIG WELDING

When adding small percentages of oxygen to inert like argon, the oxidizing nature of oxygen breaks down surface tension on the molten metal allows the puddle to due what?

A

Wet out the edges of the weld bead and minimize undercut in the molten weld.

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11
Q

SPECIALTY GMAW AND MIG WELDING

What gas is the lightest?

  1. Hydrogen
  2. Argon
  3. Helium
  4. Oxygen
A
  1. Hydrogen
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12
Q

SPECIALTY GMAW AND MIG WELDING

Argon and Helium are what types of gases?

A

Inert Gases

Does NOT combine with the products of weld zone.

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13
Q

SPECIALTY GMAW AND MIG WELDING

Where would you use pure argon shielding gas with GMAW?

A

In the welding of non-ferrous materials such as aluminum, magnesium and their alloys.

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14
Q

SPECIALTY GMAW AND MIG WELDING

What is carbon dioxide gas primarily used for?

A

Carbon Dioxide Gas is primarily used for welding of mild steel and alloy steels.

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15
Q

SPECIALTY GMAW AND MIG WELDING

What is a characteristic of helium used as a sheilding gas when used with short-circuiting metal transfer?

A

A uniform penetration pattern and a broader weld bead results.

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16
Q

CLADDING AND LAGGING

Rolls of stainless steel cladding can be ordered with what type of finish?

  1. Stucco Embossed
  2. Smooth
  3. 3/16 Corrugated
  4. All of the above
A
  1. All of the above
17
Q

CLADDING AND LAGGING

When covering pipe insulation with aluminum, the circuferential and horizontal lap should be at least how many inches?

A

2inch (50mm)

18
Q

CLADDING AND LAGGING

The lap for aluminum cladding on a horizontal pipe is usually placed away from prevailing winds at:

  1. 1 o’clock
  2. 2 o’clock
  3. 3 o’clock
  4. 4 o’clock
A

4 o’clock

19
Q

CLADDING AND LAGGING

Moisture barries are applied to Aluminum to do what?

A

Protect from corrosion

20
Q

CLADDING AND LAGGING

Stainless Steel cladding is used in place of Aluminum for what purpose?

  1. For chemical and fire resistance
  2. For cost
  3. For fire protection
  4. As a vapour barrier
A
  1. For chemical and fire resistance
21
Q

CLADDING AND LAGGING

On insulated tanks where excessive expansion and contracion takes place, the aluminum should be fastened with stainless bands and:

  1. Caulking
  2. Expansion Springs
  3. S Clips
  4. Pop Rivets
A
  1. Expansion Springs
22
Q

CLADDING AND LAGGING

When installing corrugated sheets on a vertical tower, what should be used to permanently prevent the sheets from sliding down?

  1. Expansion Springs
  2. S Clips
  3. Mechanical Fasteners
  4. Sheet Metal Screws
A
  1. S Clips
23
Q

CLADDING AND LAGGING

What measurements are required for layout of a bevel?

  1. OD of pipe, OD of Insulation, crimp
  2. OD of pipe, ID of Insulation, crimp
  3. ID of pipe, OD of Insulation, crimp
  4. ID of pipe, OD of Insulation, crimp
A
  1. OD of pipe, OD of Insulation, crimp
24
Q

CLADDING AND LAGGING

In order to a lay out Aluminum Bevels with a square, which dimensions would be placed onto the square?

A

Half OD pipe diameter

Half OD of insulation diameter

Amount of crimp

25
Q

CLADDING AND LAGGING

When laying out a gore pattern for a 90* elbow in order to have sixteen equal divisionson a stretch-out, the half circle drawn must be divided into how many divisions?

A

8 divisions

26
Q

CLADDING AND LAGGING

WHich of the following layout methods is used to layout a gore pattern?

  1. Parallel Line Development
  2. Radial Line Development
  3. Triangulation
  4. Transfer of angles
A
  1. Parallel Line Development
27
Q

CLADDING AND LAGGING1. To prevent water from getting into the insulation

Select the answer that states the primary reason for caulking any type of cladding.

  1. To prevent corrosion of the cladding
  2. To ensure a neater job
  3. To vapour seal the cladding
A
  1. To prevent water from getting into the insulation

Sheet Metal 4th Yr (5 decks)

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