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GAS WELDING - OXYACETYLENE

V. Ryan 2011

 

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Oxyacetylene gas welding is commonly used to permanently join mild steel. A mixture of oxygen and acetylene, burns as an intense / focussed flame, at approximately 3,500 degrees centigrade. When the flame comes in contact with steel, it melts the surface forming a molten pool, allowing welding to take place. Oxyacetylene can also be used for brazing, bronze welding, forging / shaping metal and cutting.

This type of welding is suitable for the prefabrication of steel sheet, tubes and plates.

 
PREPARING THE CYLINDERS FOR WELDING
 
Slowly open the main valve of the acetylene tank and adjust the acetylene pressure regulator to 5PSI (pounds to square inch).

Open the needle valve on the torch and adjust the pressure on the acetylene regulators to show 5PSI. Close the needle valve.
 
Go through the same procedure for the oxygen cylinder.
 
 
 
IGNITING THE ACETYLENE / OXYGEN MIXTURE
 
TURNING ON:

Acetylene slowly turned on (quarter/half turn of the needle valve) and ignited, producing a small flame. At this stage, a small amount of soot/smoke is given off the end of the flame.
   
Acetylene increased and oxygen turned on slowly.
   
Acetylene increased slowly and oxygen more rapidly, to produce an intense, localised flame, capable of precise welding.
   
TURNING OFF:

Turn off the oxygen first, followed by the acetylene
   
 
 
 
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