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BRAZING WITH OXYACETYLENE

V. Ryan 2016

 

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VIDEO - GAS WELDING – OXYACETYLENE - PART TWO
 

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 the flux.

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.

 
 
 
 
 
 
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