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As mentioned in W9SED's article (page 42, June, 1954, QST), it is perfectly possible to solder aluminum. However, aluminum soldering is generally not advisable, particularly on parts exposed to weather, as corrosion will soon set in and the joint will be destroyed. Proof of this can readily be seen by placing an aluminum soldered joint In ordinary tap water for a few days. Corrosion will become quite apparent and in many cases the joint will fall apart. If aluminum cannot be jointed by other satisfactory methods - such as riveting or welding - and soldering must be resorted to, then the joint should be completely covered with a protective paint or lacquer.
R.W. Woodward, W1VW.