Figure 3-44. - Typical copper fittings.

"Tinning" is the process of applying a small amount of solder to the end of the copper before it is inserted into the sweat fitting.

In soft soldering, heat is applied directly to the metal with a flame. Various types of heat-generating equipment are available. In your work, however, you generally use methylacetylene propadiene (MAPP) cutting/welding equipment or a Presto-lite heating unit.

The Presto-lite torch is ideal for SOFT SOLDERING because it delivers a small controllable flame. The Presto-lite unit consists of a small MAPP-gas cylinder,