Oxyfuel Cutting Basics
The most suitable cutting process to use on ferrous metals such as straight carbon steel is
oxyfuel cutting
Oxygen cylinders must be tested _____
every ten years
The hoses used to carry oxygen from the cylinder to the torch are usually _____.
green
How should gas cylinders be transported to a workstation?
In an upright position on a hand truck or bottle cart
What can occur when a torch tip or nozzle touches the work surface or when a bit of hot dross briefly interrupts the cutting flame?
Backfire
When cutting thin steel with oxyfuel cutting equipment, point the torch tip in the direction
the torch is traveling at a _____.
15- to 20-degree angle
The oxidation that occurs during an oxyfuel cutting operation is similar to a greatly sped-up
rusting process
Combining pure oxygen with a burning material causes a fire to _____
burn rapidly and violently
The special cutting tip for cutting off bolt heads and nuts is called a _____.
rivet cutting tip
What devices are often attached to the regulators, the torch, or both?
Flashback arrestors
When a cutting job is completed and the oxyfuel equipment is no longer needed, the first step
in shutting down the oxyfuel cutting equipment is to _____.
close the fuel gas cylinder valve
What becomes less of a problem as the thickness of the steel being cut increases?
Distortion
For long-term cutting of materials containing cadmium or mercury, always wear an approved
_____.
supplied air respirator
In the top and bottom of an acetylene cylinder are safety plugs with a melting point of _____.
212°F (100°C)
The selection of a cutting torch tip depends on the thickness of the base metal being cut and
the _____.
type of fuel gas being used
An oxyfuel cutting torch should be checked for leaks _____.
each time it is used
When an empty cylinder has been removed from the workstation and stored, it must be
marked MT (or the acceptable site notation for indicating an empty cylinder) _____.
near its top
The process of cutting a groove into a surface is known as _____.
gouging
When performing oxyfuel cutting, it is acceptable to wear _____.
a face shield over safety glasses
Three fuel gases other than acetylene used for cutting include _____.
natural gas, propylene, and propane
Tip cleaners are _____.
small round files used to remove impurities from a torch tip
A cutting flame that has an excess of oxygen is called a(n) _____
oxidizing flame
Insufficient preheat during an oxyfuel cutting operation is likely to result in _____.
bad gouging at the bottom of the cut
Gouging operations use a special tip that produces a low-velocity stream of oxygen that _____.
curves upward
Two types of gases that tend to concentrate in and along low areas are _____.
propylene and propane
As a reminder that the regulator on a cylinder has left-handed threads, a V-notch is
sometimes cut around the _____.
nut
A track burner is a device used to _____.
cut or bevel in a straight line
A carburizing flame has a white feather created by _____.
too much fuel
To minimize distortion when cutting thin steel, _____.
move as quickly as possible without losing the cut
Portable oxyfuel track burners can be used for _____.
straight-line cutting and bevel cutting