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Soft Soldering

The solder is an 340 Fahr .; or, for cheapness, the proportion is sometimes 3 to 2, fusible at 334°. This substance is applied with a hot copper tool called a soldering-iron, or by blowpipe flame.

Heat, however, causes the edges of the metal to oxidize; therefore the edges are covered with a substance having a strong attraction for oxygen, and disposing the metal to unite substances are called fluxes, and are chiefly to the solder at a low temperature . Such borax, resin, sal-ammoniac, muriate of zinc, Venice turpentine , tallow, or oil.

Soldering oldering and Welding.

Soldering is the art of uniting the surfaces of metals by partial fusion, and the insertion of an alloy between the edges, which is called solder , it being more fusible than the metals which it unites. Solders are distin- brass or other similar alloy, resin, sal-ammo-