Change 4 7-11
Keep soldering irons away from flammable
In order to avoid burns, always assume that
the tip is hot.
Never rest a heated iron anywhere but on a
metal surface or on a rack provided for this purpose.
Never swing an iron to remove solder.
When cleaning an iron, use a cleaning cloth
or damp sponge .
Hold small soldering jobs with your pliers or
a suitable clamping device.
Tinning. If a soldering iron is new or the tip coat-
ing is deteriorated, it must be tinned (coated with solder).
To accomplish this procedure, proceed as follows:
Hold the iron in a vise and file the point to its
Heat iron tip.
While hot, file lightly to remove scale and old
Dip the point into a flux and apply solder,
Federal Specification QQ-S-571, to the tip of the iron.
The coating of solder will be bright and shiny and very
thin. This aids in the rapid transfer of heat to the work.
Soldering Procedure. The following procedures
must be performed in order to ensure a firmly soldered
Ensure that the parts to be soldered are
absolutely clean. While cleaning these parts, take care
not to produce cuts or nicks which greatly reduce the
mechanical strength of the wire, especially under vibra-
The joint should be prepared just prior to
Securely join the parts to be soldered before
any soldering is done.
As shown in figure 7-23, hold the soldering
iron beneath the splice being soldered with as much
mechanical contact as possible to permit maximum heat
Apply the solder, Federal Specification
QQ-S-571, to the splice.
Before the solder itself melts, the rosin core
will have melted and run out over the splice to
flux the area.
When the solder has coated the splice com-
pletely, the job is finished. A good, well-bonded connec-
tion is clean, shiny, smooth, and round. It approximately
outlines the terminal and the wire.
Care. The following paragraphs describe proce-
dures for the care and upkeep of the different types of
Soldering gun. The tip of a soldering gun
should be removed occasionally to permit cleaning away
the oxide scale. If for any reason the tip does become
damaged, replacement tips are available.
Soldering iron. Observe the following prac-
tices for the care of soldering irons:
(a) Ensure that removable tips are
securely fastened into the heater unit.
(b) Keep the tips clean and free from cop-
(c) After completing a job, disconnect the
powercord and, when the iron has cooled off, stow it in its
proper storage area.
(d) When storing irons for long periods of
time, coat the shaft and all metal parts with rust-preven-
tive compound and store in a dry place.