Fuel/Gas Cutting and Welding Flashcards
The size of a gas cylinder is measured in what units?
Cubic Feet
Acetylene cylinders are packed with a porous material saturated with ________, used to absorb a large
quantity of acetylene under pressure.
Acetone
Oxy-acetylene system design restricts the oxygen line from being placed in the acetylene side by
making the threads of the acetylene connections left handed
. Which type of flame will have an “acetylene feather”, indicating that more oxygen needs to be added
Carbonizing
When cutting with oxy-acetylene, what is the common reason for a rough edge and uncut material?
Travel Speed too Fast
When piercing plate or pipe, approach the material surface at a _________ angle.
45 degree
A braze weld color that is darker than the original brazing rod is an indication of
too little heat or too fast a travel speed
When cutting with a hacksaw, select a blade tpi size that allows at least ______ teeth to contact the
material at one time.
Three
The hole size for a tap is typically _______ than the tap size for course threads.
1/16 Inch
Adjust the tool rest of a stationary grinder within _________ of the wheel
1/16 Inch
Annealing means to ____.
heat metal to a high temperature and cool very slowly
The purpose of the flux coating on an electrode is to ___
Protect the weld from oxygen
All SMAW welding machines are constant current; this means they
provide an even supply of amperage to the electrode
A machine’s ____ is a rating that indicates how long the machine can continuously operate at a given
amperage during a ten-minute period without overheating
Duty Cycle
What is Slag?
weld waste and impurities that form at the top of the weld bead
What is unique about fast freeze electrode
provide deep penetration, light slag, and the ability to weld out of position
A diffuser on a plasma cutter, also known as a swirl ring, does what to the gas?
Causes the gas to swirl and energize
When plasma cutting, dross is
The debris caused by the cutting process
The two main differences between a dedicated SMAW machine and one designed for GTAW are
the addition of shielding gas flow rate and amperage controls
The difference in the hazards between GTAW and SMAW is that GTAW produces….
More light and less smoke
What does GTAW stand for?
Gas tungsten arc welding
What does SMAW stand for?
Shielded metal arc welding
The first industrial robot was built to do what job?
Spot weld on a factory line
How many welding jobs will be available by 2025?
370,000 open positions
