Figure 6-5.Tinning a copper (solder placed directly on copper).
Figure 6-6.Forging a soldering copper.
powder form. Dissolve the powder in water according
to the directions and dip the soldering copper into the
solution and then apply the solder.
Forging Soldering Coppers. Soldering coppers
may be reshaped by forging when they become blunt or
otherwise deformed. The procedure for forging a copper
is as follows:
1. File the copper to remove all old tinning and to
smooth the surfaces.
2. Heat the copper to a bright red.
3. Hold the copper on an anvil and forge it to the
required shape by striking it with a hammer. (See
fig. 6-6.) As you reshape the copper, a hollow will
appear at the point. Keep this hollow to a minimum by
striking the end of the copper. Do not shape too long a
taper or sharp point, because this causes the copper to
cool too rapidly. Turn the copper often to produce the
necessary squared-off sides and reheat the copper as
often as necessary during this part of the forging.
Figure 6-7.Presto-lite heating unit.
4. Reheat the copper to a bright red, and use a
flat-faced hammer to remove as many hollows as
5. File and tin the copper using the previously
ELECTRIC SOLDERING COPPERS. Elec-
tric soldering coppers, or soldering irons, as they some-
times are called, are built with internal heating coils. The
soldering heads are removable and interchangeable.
Tinning is basically the same with the exception that the
tip usually does not become cherry red. Forging or
reshaping is not necessary, because the heads are easily
Electric soldering irons are usually used for electri-
cal work or other small jobs. They are especially suited
for this type of work, because they do not require
auxiliary heating and they can be manufactured as small
as a pencil.
GAS TORCHES. Gas torches can be used in
combination with soldering head attachments or as a
direct heat source. The Presto-lite heating unit is ideal
for soft soldering, because it delivers a small control-
lable flame. It also may be used effectively to heat
soldering coppers. As figure 6-7 shows, this heating unit
includes a fuel tank regulator, hose, and torch. It burns
acetylene or MAPP gas as fuel in the presence of oxy-
gen. The torch tip (stem) is interchangeable with other
tips that come with the unit.