Английский для сварщиков. Гричин С.В. - 86 стр.

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86
The blowtorch
A blowtorch is a special type of
gas welder. It has an additional lever on
the handle that, when squeezed, supplies
an extra flow of oxygen out of a center
hole in the mouthpiece. When the steel is
heated to its melting point, the extra flow
of oxygen will burn (oxidise) the molten
iron and blow it away, effectively cutting
the steel. The word "blowtorch" is often
used loosely to mean any sort of oxy-gas
torch.
After reading activity
Match each term with its meaning
1. acetylene A. A flammable fuel gas composed of carbon and hydrogen
having the chemical formula C2H2.When burned with
oxygen, it produces a hot flame, having a temperature
between 5700°F and 6300°F. It is a colorless gas, having a
disagree-able odor that is readily detected even when the gas
is highly diluted with air. When a portable welding outfit, it is
obtained directly from the cylinder. In the case of stationary
equipment, it can be piped to a number of individual cutting
stations.
2. oxygen B. A chemical element with the chemical symbol O and
atomic number 8. It is the second most common element on
Earth, composing around 49% of the mass of Earth's crust and
28% of the mass of Earth as a whole, and is the third most
common element in the universe. On Earth, it is usually
covalently or ionically bonded to other elements.
3. hydrogen C. A chemical element in the periodic table that has the
symbol H and atomic number 1. At standard temperature and
pressure it is a colorless, odorless, nonmetallic, univalent,
tasteless, highly flammable diatomic gas (H2). With an
atomic mass of 1.00794 g/mol, it is the lightest element. It is
also the most abundant, constituting roughly 75% of the
universe's elemental matter
An old-fashioned kerosene blowtorch

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