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28: Know and Understand
When mild steel reaches its _____ temperature, it can be cut with a concentrated stream of pure oxygen.
Acetylene is made by submerging calcium carbide in _____.
A(n) _____ should be in place to protect the soft valve whenever a compressed gas cylinder is not in use.
A standard size compressed oxygen cylinder contains 250 cubic feet of pure oxygen and is compressed at a pressure of _____ psi.
Which hose grade is designed for use with propane and other fuel gases?
The most common type of oxyfuel torch is the _____ torch.
Cutting tips designed for acetylene are made from solid pieces of _____.
Large multiflame tips, also called _____, may require acetylene to be withdrawn from a cylinder at a rate that is greater than 1/7th of the cylinder capacity per hour.
If the torch flame disappears and a shrill hissing sound is heard, the torch should be quickly shut down because this is an indication of a(n) _____.
Compressed gas cylinders should be transported, stored, and used in a secured, _____ position.
True or False?
Petroleum-based lubricants are safe to use on oxyfuel equipment.
A. True
B. False
What should be used to handle hot metal?
How can a carburizing flame be recognized?
How can an oxidizing flame be recognized?
After a successful torch cut, a minimal amount of _____ should remain adhering to the base metal.
During oxyfuel welding, the welder should
not
allow the filler rod to directly contact the base metal, the _____ of the flame, or the torch.
Why must flux be used with brass or bronze filler material in the brazing process?
What would happen if a welder used a lower working pressure than recommended when operating a multiflame attachment?
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