How Gas Welding Torch Works?
Gas welding torches are devices that are used to control the mixing of combustible gas (acetylene or propane, mainly) with oxygen to produce a directional welding flame.
“According to the method of supplying combustible gas and oxygen to the mixing chamber of the torch, burners can be injected and non-injected. “
In construction, injection burners are predominantly used. The diagram of the injection burner is shown in the figure.
Oxygen at high pressure is supplied through the nipple 10 oxygen entrance and valve 7 to the central nozzle of the injector 5.
Exiting the narrow nozzle of the injector at high velocity, the oxygen creates a significant vacuum, allowing the combustible gas to be sucked in and enter the mixing chamber 4, passing under a small pressure through the nipple 9 and valve 6.
From the mixing chamber, the combustible mixture enters the mouthpiece 2 through the tip channel, at the outlet of which a welding flame is formed during combustion.
Burners of this type have a set of interchangeable tips with mouthpieces, which are attached to the torch body by means of a cap nut. Interchangeable tips allow you to adjust the power of the welding flame.
In injector-less burners, combustible gas and oxygen are supplied at approximately the same pressure of up to 0.01-0.12 MPa. They do not have an injector, which has been replaced by a simple mixing nozzle.