. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . Fig. 48—A simple alcohol torch for soldering to apply the solder, as long standing will produce a thinfilm of oxide, to which solder does not readily the surface is cleaned, it should not be touched withthe fingers, as this always leaves grease upon the sur-face no matter how clean the hands are kept. After thescraping is done and the soldering copper is heated, theflux should be applied. A good flux for soft solderingcan be prepared by
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . Fig. 48—A simple alcohol torch for soldering to apply the solder, as long standing will produce a thinfilm of oxide, to which solder does not readily the surface is cleaned, it should not be touched withthe fingers, as this always leaves grease upon the sur-face no matter how clean the hands are kept. After thescraping is done and the soldering copper is heated, theflux should be applied. A good flux for soft solderingcan be prepared by dissolving small pieces of zinc in 74 Model Engineering hydrocliloric acid. When this is done, a violent chemi-cal reaction takes place between the zinc and the acid,which results in the formation of a solution of zincchloride. This is kept in a small glass bottle and appliedwith a small bristle brush or wooden dauber. In makingthis solution, the zinc should be added to the acid untilno more chemical action takes place. With the surface prepared according to the foregoingdirections, and with the flux in place, the solder is ready. 5/cite. Charcoal Block Fig. 49—A silver solderiiig outfit to be applied. Solder in the form of a heavy mre is themost convenient to use, especially for the beginner. Thecopper should be brought in contact with the work andthe solder fed to the tip or point of the copper as fastas it melts and runs. If it melts at the instant it touchesthe copper, this indicates that the copper is far too hot,and this is a common mistake of many beginners. Thecopper should be just hot enough for the solder to meltafter it has been iU contact with it for a short the solder has attached itself to the metal, it may Soft and Hard Soldering 75 appear very uneven in places, and to remedy this thehot copper is rnn lightly over the joint to even the de-pressions and projections. In heating the soldering cop-per, the tip or end should not be placed directly in co
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