A gas welder fuses metals by mixing oxygen and fuel gas. There are controls provided in the welder over the proportions of the gases and amount that should be burnt up. The torches have two needle valves. One is used to control the amount of oxygen that has
to flow. Another valve helps us to control the flow of the fuel gas.
The torches are of two types;
- Low pressure
- Medium pressure
A low pressure torch is otherwise called as an injector torch. In this torch the fuel gas pressure is less than or equal to 1 pound per square inch. Oxygen pressure is anywhere between 10-40 pounds. This depends upon the size of the tip of the torch.
A medium pressure torch is otherwise called as a balanced pressure torch. Sometimes it is referred to as an equal pressure torch. This is primarily because the pressure of fuel gas and oxygen are equal.
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