Before soldering there are three factors which must be considered. The design must lend itself to soldering, parts to be soldered must fit closely and accurately and the correct solder and flux must be used.
Solders are typically classified according to their melting points – easy, medium and hard. This therefore refers to the ease of melting the solder. Hence an easy grade solder melts before a hard grade one. This can be used where a sequence of joints are to be made. Usually a solder must conform to the same hallmarking rules as the metal being joined – for example, a 9ct solder must contain at least 37.5% gold. However, there are some concessions such as Platinum Solders and some white gold alloys.
Gas and compressed air mixtures are generally the most satisfactory for torch soldering. Fine adjustment of flame size and temperature are possible. The flame should be kept constantly on the move over the whole joint area, or over as wide an area as can be conveniently joined, in a single application of solder.
The joint areas must be free from dirt and grease, and ideally cleaned with a file or emery paper to ensure the solder will wet the...
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