These metals are easily joined, but the action of solder
with iron, steel and aluminum is not so satisfactory and requires greater
care and skill.
The solder is caused to make a perfect union with the surfaces treated with
the help of heat from a soldering iron. The soldering iron is made from a
piece of copper, pointed at one end and with the other end attached to an
iron rod and wooden handle. A flux is used to remove impurities from the
joint and allow the solder to secure a firm union with the metal surface.
The iron, and in many cases the work, is heated with a gasoline blow torch,
a small gas furnace, an electric heater or an acetylene and air torch.
The gasoline torch which is most commonly used should be filled two-thirds
full of gasoline through the hole in the bottom, which is closed by a screw
plug. After working the small hand pump for 10 to 20 strokes, hold the palm
of your hand over the end of the large iron tube on top of the torch and
open the gasoline needle valve about a half turn. Hold the torch so that
the liquid runs down into the cup below the tube and fills it. Shut the
gasoline needle valve, wipe the hands dry, and set fire to the fuel in the
cup. Just as the gasoline fire goes out, open the gasoline needle valve
about a half turn and hold a lighted match at the end of the iron tube to
ignite the mixture of vaporized gasoline and air. Open or close the needle
valve to secure a flame about 4 inches long.
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