1. Oxyacetylene is often used to produce precise brazed
joints. The two pieces of steel to be brazed, are cleaned with emery
cloth, removing grease and dirt. Flux is applied to the joint. This
protects the area to be brazed, preventing oxidation (oxidation will
prevent the ‘solder’ from flowing along the joint).
2. The area is
preheated by holding the torch a small distance from the steel. This
slowly warms up the two surfaces to be joined and evaporates the water in
3. The flame is focussed at one end of the joint,
raising the temperature of the steel to ‘red heat’. Brazing rod is fed
into the joint . The molten brazing rod follows the heat of the flame, as
the torch proceeds along the joint, until the brazing is complete.
4.The steel is allowed to cool slowly. When cold, a wire brush is used to
clean the joint, revealing a ‘bronzed’ line of solder, which holds the two
pieces of steel permanently together.