This torch
gives the correct degree of heat and may be regulated to give a clean and
easily controlled flame.
Regardless of the source of heat, the fire or flame must be adjusted so
that no soot is deposited on the metal surfaces of the work. This can only
be accomplished by supplying the exact amounts of gas and air that will
produce a complete burning of the fuel. With the brazing torches in common
use two heads are furnished, being supplied from the same source of fuel,
but with separate regulating devices. The torches are adjustably mounted in
such a way that the flames may be directed toward each other, heating two
sides of the work at the same time and allowing the pieces to be completely
surrounded with the flame.
Except for the source of heat, but one tool is required for ordinary
brazing operations, this being a spatula formed by flattening one end of a
quarter-inch steel rod. The spatula is used for placing the brazing metal
on the work and for handling the flux that is required in this work as in
all other similar operations.
_Spelter._--The metal that is melted into the joint is called spelter.
While this name originally applied to but one particular grade or
composition of metal, common use has extended the meaning until it is
generally applied to all grades.
Spelter is variously composed of alloys containing copper, zinc, tin and
antimony, the mixture employed depending on the work to be done.
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