Soldering, Brazing, and welding by Jones Bernard E

Author:Jones, Bernard E.
Language: eng
Format: epub, pdf
Tags: Brazing, Solder and soldering, Welding
Publisher: New York, Pratt

SOLDERING JKWKIJ.KRY «5

suit tin' qualify ot the gold to be soldered, so that they

"colour " well ami thus hide the joint. Td lowing is a list of coloured solders:

Best solder: Fine gold, 12J parts; fine silver, 4J parts; copper, 3 parts.

Medium: Fine gold, 10 parts; fine silver, 6 parts; copper, 4 parts.

Common : Fine gold, 8J parts; fine silver, 6J parts; mpper, 5 parts.

The gold solder is cast in long ingots, rolled thin and flat, and cut up or filed into dust, and thus applied to the cleaned joints, using borax as a flux. After the joint has been closed under a blowpipe flame, the whole ring is annealed on an annealing plate to a dull red heat, then cooled, pickled in acid, and polished. The film of grease left by the polishing process is washed off in hot soda water, and the ring dried in hot sawdust. Hard-soldered rings may be coloured with a film of electro-deposited gold.

If the gold is of common quality, under 12-carat, to remove any excess solder make a mixture by reducing to powder 1 oz. of green copperas and J oz. of saltpetre and boiling in 5 oz. of water. This will crystallise when cool. Redissolve the crystals in eight times their bulk of muriatic acid. For use, add boiling water, and place the gold in the hot mixture. For gold of 12-carat or over, nitric acid and water (1 part of acid to 2 of water) will dissolve the solder without injuring the gold. ^ Gold solders used on gold articles are made from

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