how gas welding torch works

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 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 channelat 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 They do not have an injector, which has been replaced by a simple mixing nozzle.

Material Welding is run by highly experienced welding engineers, welding trainers & ASNT NDT Level III bloggers. We strive to provide most accurate and practical knowledge in welding, metallurgy, NDT and Engineering domains.