Английский для сварщиков. Гричин С.В. - 81 стр.

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81
Cylinder packing (level
of maximum
compression)
Stability (temperature)
Cylinders contain (pure
fuel or not)
Dangerous effects on
health
Reading
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Text 3. Oxy-Fuel Welding and Cutting
Oxy-fuel welding is a welding process commonly called oxyacetylene
welding since acetylene is the predominant choice for a fuel, or often simply
gas welding. A virtually identical procedure, with a different type of gas
torch, is used for cutting metal and called oxy-fuel cutting. In gas welding
and cutting, the heat energy and high temperature needed to melt the metal is
obtained by the combustion of a fuel gas with oxygen in a torch. This sort of
torch is often called a blowtorch.
Fuels
The most commonly used fuel gas is
acetylene. Other gases used are liquefied
petroleum gas (LPG), natural gas, hydrogen, and
MAPP gas.
Acetylene can be made near where the
welding is being done in an acetylene generator.
More often it is made elsewhere and shipped to
the welding site in special containers. These
containers are packed with various porous
materials (e.g. kapok fibre), then filled about
half way with acetone. The acetylene dissolves
into the acetone. This method is necessary
because above 207 kPa (30 lbf/in²) acetylene is
unstable and may explode. There is about 1700
Compressed gas cylinders
containing oxygen oxygen and
MAPP gas

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