Custom Metal Fabrication Flashcards
SPECIALTY GMAW AND MIG WELDING
What is the most common metal transfer when welding base metal that is made of coated steel or stainless?
Short Circuit Transfer
SPECIALTY GMAW AND MIG WELDING
What does GMAW stand for?
Gas Metal Arc Welding
SPECIALTY GMAW AND MIG WELDING
What GMAW process is used most for sheet metal work?
Short Circuit Transfer
SPECIALTY GMAW AND MIG WELDING
What effect does changing the wire speed have on the voltage or amperage of the welding process?
- The current vaties with the amount of wire speed
- The current increases in proportion to the wire speed
SPECIALTY GMAW AND MIG WELDING
Which organizations have written specifications for GMAW filler metals?
- AWS
- CSA
SPECIALTY GMAW AND MIG WELDING
When using GMAW on mild steel with carbon dioxide sheilding, which type of filler wire should be selected?
Deoxidized Wire
SPECIALTY GMAW AND MIG WELDING
When wires are packaged in sealed containers, from what are we protecting them from?
Moisture Contamination
SPECIALTY GMAW AND MIG WELDING
Improperly stored wires most often produce welds with which defect?
Porosity
SPECIALTY GMAW AND MIG WELDING
Filler metals containing additional deoxidizers are intended for use which metals?
Moderately rusty low-carbon steels
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?
Wet out the edges of the weld bead and minimize undercut in the molten weld.
SPECIALTY GMAW AND MIG WELDING
What gas is the lightest?
- Hydrogen
- Argon
- Helium
- Oxygen
- Hydrogen
SPECIALTY GMAW AND MIG WELDING
Argon and Helium are what types of gases?
Inert Gases
Does NOT combine with the products of weld zone.
SPECIALTY GMAW AND MIG WELDING
Where would you use pure argon shielding gas with GMAW?
In the welding of non-ferrous materials such as aluminum, magnesium and their alloys.
SPECIALTY GMAW AND MIG WELDING
What is carbon dioxide gas primarily used for?
Carbon Dioxide Gas is primarily used for welding of mild steel and alloy steels.
SPECIALTY GMAW AND MIG WELDING
What is a characteristic of helium used as a sheilding gas when used with short-circuiting metal transfer?
A uniform penetration pattern and a broader weld bead results.
CLADDING AND LAGGING
Rolls of stainless steel cladding can be ordered with what type of finish?
- Stucco Embossed
- Smooth
- 3/16 Corrugated
- All of the above
- All of the above
CLADDING AND LAGGING
When covering pipe insulation with aluminum, the circuferential and horizontal lap should be at least how many inches?
2inch (50mm)
CLADDING AND LAGGING
The lap for aluminum cladding on a horizontal pipe is usually placed away from prevailing winds at:
- 1 o’clock
- 2 o’clock
- 3 o’clock
- 4 o’clock
4 o’clock
CLADDING AND LAGGING
Moisture barries are applied to Aluminum to do what?
Protect from corrosion
CLADDING AND LAGGING
Stainless Steel cladding is used in place of Aluminum for what purpose?
- For chemical and fire resistance
- For cost
- For fire protection
- As a vapour barrier
- For chemical and fire resistance
CLADDING AND LAGGING
On insulated tanks where excessive expansion and contracion takes place, the aluminum should be fastened with stainless bands and:
- Caulking
- Expansion Springs
- S Clips
- Pop Rivets
- Expansion Springs
CLADDING AND LAGGING
When installing corrugated sheets on a vertical tower, what should be used to permanently prevent the sheets from sliding down?
- Expansion Springs
- S Clips
- Mechanical Fasteners
- Sheet Metal Screws
- S Clips
CLADDING AND LAGGING
What measurements are required for layout of a bevel?
- OD of pipe, OD of Insulation, crimp
- OD of pipe, ID of Insulation, crimp
- ID of pipe, OD of Insulation, crimp
- ID of pipe, OD of Insulation, crimp
- OD of pipe, OD of Insulation, crimp
CLADDING AND LAGGING
In order to a lay out Aluminum Bevels with a square, which dimensions would be placed onto the square?
Half OD pipe diameter
Half OD of insulation diameter
Amount of crimp
