exam Flashcards
While using the oxy-fuel cutting process, when does the cutting begin?
a. When the oxygen flow begins.
b. When the acetylene flow begins.
c. When the metal has been heated to cherry red.
d. When the preheat flames reach 870 °C (|6oo °F).
What is used for oxy-fuel cutting on metals that are oxidation resistant?
a. Flux.
b. Iron-oxide.
c. Higherpreheatflames.
d. Chemical cleaners.
Which fLiel gases can be used in the oxy-fuel cutting process?
a. Acetylene, MAPp and oxygen.
b. Acetylene, propane and argon.
c. Acetylene, propane and natural gas.
d. Acetylene, MAPp and argon.
How does the oxy-fiiel gas process work?
a. It uses radiation to distort the iron in the base metal that creates a narrow opening.
b. It uses acetylene to create high preheat flames and cut a kerf in the base metal.
c. Itcauses excellerated meltng in the kerfofthe base metal that falls away.
d. It causes rapid oxidati.on that forms a molten slag and is blown off the metal.
When are preheat flames active during the oxy-fuel cutting process?
a. When the fuel gas lever is depressed.
b. As socin asthetorch is ignited.
c. As soon astheflames reach ignition temperature.
d. When theflowofcutting oxygen is not present.
What is washing?
a. Cutting several layers of plateat one time.
b. Removal of weld root passes.
c. Removal of bolts.
d. Removal ofa thin layer of metal.
what is scarfing?
a. Cuttingseveral layers of plates at onetime.
b. Removal of weld root passes.
c. Removalof bolts.
d. Removal ofa thin layerof metal
Why is oxy-fuel cutting mainly limited to low and medium carbon steels?
a. They have low exothermic properties.
b. They respond wellto preheat flames.
c. They have high igniti.on temperatures.
d. They are easilyoxidized.
