Soldering

Soldering

1. Soft soldering

   • Joins metal parts together using lead-free alloy.
   • Used for light applications, e.g. electrical connections and plumbing joints.
   • Method: 1. flux is applied to the join to clean. 2. fluxed joint is heated using gas torch.

2. Brazing/hard soldering

   • Used for heavy applications because the joint is stronger.
   • The alloy (shelter) melts at a higher temp. than soft solder.
   • Joins mild steel, but copper can be brazed.
   • Method: 1. borax flux mixed to paste with water and applied to joint. 2. heated to orange colour with gas torch and splatter melts around the join.

3. Silver soldering

   • Like brazing, but uses silver based alloy.
   • Used on brass, copper and building metal.
   • Silver alloy melts at lower temp. than brazing spelter.