Английский для сварщиков. Гричин С.В. - 172 стр.

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172
In resistance welding, that part of the postweld interval during which a
current suitable for tempering or heat treatment flows. The current can
be single or multiple impulse, with varying heat and cool intervals.
TEMPERING:
Reheating hardened steel to some temperature below the lower critical
temperature, followed by a desired rate of cooling. The object of
tempering a steel that has been hardened by quenching is to release
stresses set up, to restore some of its ductility, and to develop
toughness through the regulation or readjustment of the embrittled
structural constituents of the metal. The temperature conditions for
tempering may be selected for a given composition of steel to obtain
almost any desired combination of properties.
TENSILE STRENGTH:
The maximum load per unit of original cross-sectional area sustained
by a material during the tension test.
TENSION TEST:
A test in which a specimen is broken by applying an increasing load to
the two ends. During the test, the elastic properties and the ultimate
tensile strength of the material are determined. After rupture, the
broken specimen may be measured for elongation and reduction of
area.
THERMIT CRUCIBLE
The vessel in which the thermit reaction takes place.
THERMIT MIXTURE:
A mixture of metal oxide and finely divided aluminum with the
addition of alloying metals as required.
THERMIT MOLD:
A mold formed around the parts to be welded to receive the molten
metal.
THERMIT REACTION:
The chemical reaction between metal oxide and aluminum which
produces superheated molten metal and aluminum oxide slag.
THERMIT WELDING:
A group of welding processes in which fusion is produced by heating
with superheated liquid metal and slag resulting from a chemical
reaction between a metal oxide and aluminum, with or without the
application of pressure. Filler metal, when used, is obtained from the
liquid metal.
THROAT DEPTH:
In a resistance welding machine, the distance from the centerline of the
electrodes or platens to the nearest point of interference for flatwork or

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