Figure 6-11.Making solder beads.
moving the joint. When you use a corrosive flux, clean
the joint by rinsing it with water and then brushing or
wiping it with a clean, damp cloth.
Riveted seams are often soldered to make them
watertight. Figure 6-10 shows the procedure for solder-
ing a riveted seam.
Solder beads, or solder shots, are sometimes used
for soldering square, rectangular, or cylindrical bottoms.
To make the solder beads, hold the solder against a hot
copper and allow the beads to drop onto a clean surface,
as shown in figure 6-11.
To solder a bottom seam with solder beads, you
should first flux the seam before dropping one of the
cold beads of solder into the container. Place the hot
soldering copper against the seam, as shown in figure
Figure 6-12.Soldering a bottom seam.
Figure 6-10.Soldering a riveted seam.
6-12. Hold the copper in one position until the solder
starts to flow freely into the seam. Draw the copper
slowly along the seam, turning the work as you go. Add
more beads as you need them and reheat the copper as
To heat an electric soldering copper, you merely
plug it in. Otherwise, the procedure is much the same as
that just described. Be very careful not to let an electric
soldering copper overheat. Overheating can burn out the
electrical element as well as damage the copper and
Soldering Aluminum Alloys
Soldering aluminum alloys is more difficult than
soldering many other metals. The difficult y arises pri-
marily from the layer of oxide that always covers alu-
minum alloys. The thickness of the layer depends on the
type of alloy and the exposure conditions.
Using the proper techniques, many of the aluminum
alloys can be successfully soldered. Wrought aluminum
alloys are usually easier to solder than cast aluminum
alloys. Heat-treated aluminum alloys are extremely dif-
ficult to solder, as are aluminum alloys containing more
than 1% magnesium.
The solders used for aluminum alloys are usually
tin-zinc or tin-cadmium alloys. They are generally
called ALUMINUM SOLDERS. Most of these solders
have higher melting points than the tin-lead solders used
for ordinary soldering. Corrosive and noncorrosive
fluxes are used for soldering aluminum.