Metals
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Ferrous metals
Ferrous metals contain iron. Examples are cast iron, mild steel, medium carbon steel, high carbon steel, stainless steel, and high speed steel.
Non-ferrous metals
Non-ferrous metals do not contain iron. Some common non-ferrous metals are aluminium, duralumin, copper, zinc, brass, gilding metal and tin
Joining Metals
Brazing
Welding
Riveting
Machine Nuts & bolts
1.Two pieces of steel sheet are to be brazed. The steel must first be cleaned so that grease and dirt is removed. Wire wool or emery cloth are the most suitable abrasives.
A borax flux (powder) is mixed with water to produce a paste which is brushed along the joint. Flux prevents oxidation taking place on the metal surfaces as this would prevent brazing being successful.
The compressor is turned on and this pressurises the gas and air. As the gas-air control is slowly turned on, gas is fed through the nozzle and this is ignited by a pilot light on the nozzle or by a match.
Once alight the gas-air control is turned to allow more air/gas through the nozzle which gives a longer, more fierce flame. The length of the flame can be adjusted with the control until the desired type of flame is achieved. As a rough guide, a blue section of flame will appear near the nozzle, the end of this is the hottest part of the flame.
The two pieces of steel should have already been placed on the rotating table. Fire bricks are used to raise both pieces slightly off the surface of the table so that heat can flow all the way round it. Fire bricks should also be placed at the back and sides of the metal so that heat does not escape and is reflected back.
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