Exam 21: Oxyacetylene Cutting

Combination torches are usually longer and have larger gas flow passages than the dedicated cutting torches.

Materials that are thick, are round, or have surfaces covered with rust, paint, oil, and so on, require less preheat flame.

The kindling temperature of steel in pure oxygen is about ____.

The ____________________ temperature of a material is the temperature at which combustion (rapid oxidation) can begin.

A pressure setting that is too high results in ____.

If a cut is to be started in a place other than the edge of the plate, the inner cones should be held as close as possible to the metal.

Never use a cutting torch to cut open a used can, drum, tank, or other sealed container.

If ____ is used in a tip that was designed to be used with one of the other fuel gases, the tip may overheat, causing a backfire or the tip to explode.

Too fast a cutting speed results in ____.

Too slow a cutting speed results in ____.

An injector-type torch must be used if a low-pressure acetylene generator or low-pressure residential natural gas is used as the fuel gas supply.

____ is used in tips having eight preheat holes or in a two-piece tip that is not recessed.

When removing a cutting tip, if the tip is stuck in the torch head, tap the side of the tip with a plastic hammer.

An excessive amount of preheat flame results in ____.

Most nonferrous metals-such as brass, copper, and aluminum-can be cut by oxyacetylene cutting.

Keep the inner cones of the flame approximately 1/8 in. to 1/4 in. from the surface of the plate. This distance is known as the ____________________ distance.

Sunglasses or other dark shaded glasses are safe to use for oxyacetylene cutting.

Most cutting tips are made of ____________________ .

If ____ is used in a deeply recessed, two-piece tip, the tip will overheat, causing a backfire or the tip to explode.

The kindling temperature of iron results in a ____ color.