Cutting Chapter 2 Flashcards
Welding boots should be what?
8” or taller high-top shoes or boots
Make sure your boots what?
The tongue and lace area of the footwear will be covered by a pant leg.
Before cutting containers such as tanks or barrels, check to see what?
If they have contained any explosive, hazardous, or flammable materials.
Example containers can have?
Petroleum Products
Citrus Products
Chemicals that decompose into toxic fumes when heated.
For long-term cutting of such materials, always wear…
approved full face, supplied-air respirator (SAR) that using breathing air supplied externally of the work area.
Oxygen (O2) is
a colorless, odorless, tasteless gas that supports combustion.
Combined with burning material, pure oxygen causes
a fire to flare and burn out of control.
The cylinders must be tested every
10 years
When combined with Oxygen, Acetylene create a flame that burns
hotter than 5,500F
Oxygen, Acetylene
is one of the hottest flames.
Acetylene cylinders have what
safety plugs in the top and bottom of the cylinder
Melting point of cylinder safety plugs melt at
212 F
In the event of a fire, the fuse plugs will
release the acetylene gas, preventing the cylinder from exploding.
A Dow Chemical Company product that is a chemical combination of acetylene and propane gases.
MAPP
Hydrocarbon-based gases that are stable and shock-resistant, making them relatively safe to use.
Propylene Mixtures
Acetylene
More than 5,500 F
Propylene
5,130 F
If high volumes of gas are removed from a liquefied fuel gas cylinder,
the pressure drops, and the temperature of the cylinder will also drop.
Oxygen regulators differ from
fuel gas regulators.
Fuel Gas regulators may have
red markings and usually have left-hand threads on all the connections.
As a reminder that the regulator has left hand threads,
a V-notch may be cut around the nut.
The fuel gas regulator’s high-pressure gauge usually reads up to?
usually reads up to 400 psi.
Hoses transport gases from..
the regulators to the torch.
Oxygen hoses are usually what
green with right hand threaded connections.
Hoses for fuel gas are usually
red and have left-hand threaded connections.
The fuel gas connections may also be
grooved as a reminder that they have left-handed threads.
The combination torch consists of a cutting torch attachment that..
fits onto a welding torch handle.
Combination torches are normally used in
light-duty or medium duty applications.
On combination torches, fuel gas and oxygen valves are on
the torch handle.
The cutting attachment on a combination torch has a
cutting oxygen level and another oxygen valve to contol the preheat flame.
Rivet cutting tips are used ti
cut off rivet heads, bolt heads and nuts.
When does equipment have to be tested for leaks immediately
after it is set up and periodically thereafter.
The torch should be checked for leaks
each time before use.
Could cause a fire or explosion if undetected.
Leaks
A flame has a white feather created by excess fuel.
A carburizing flame.
The length of the feather depends on the amount of excess….
fuel resent in the flame.
When a cutting job is completed, and the oxyfuel equipment is no longer needed,
It must be shut down.
Thin steel is
(3/16) “ thick or less.
A major concern when cutting thin steel is
distortion caused by the heat of the torch and the cutting process.
To minimize distortion when cutting thin steel.
move as quickly as you can without losing the cut.
Is the process of cutting a groove into a surface.
Gouging.
Are basic guidance systems driven by a variable speed electric motor to enable the operator to cut or bevel straight lines at any desired speed.
Machine oxyfuel gas cutters or track burners
Has an excess of oxygen.
Oxidizing flame.
Oxyfuel flame types
Neutral
Carburizing
Oxidizing
