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Straight answers to the questions people ask most when choosing and using gas welding and heating nozzles.
A welding nozzle gives a small, focused flame for melting metal and is sized for the thickness being joined. A heating nozzle gives a much bigger flame, often with many flame ports, for heating larger areas for bending, straightening, preheating or freeing seized parts. A brazing nozzle produces a softer, wider flame suited to heating the joint evenly without melting the parent metal.Some heads are specialised, such as flame cleaning heads for removing scale and paint. Choose a nozzle for the job you do, for your torch and for your fuel gas.
Nozzles must match the torch they are used with. Torches differ in their connection, in the way they mix and feed the gases, and in the fuel gas they are designed for, so each torch has its own series of nozzles. Injector (low-pressure) designs and positive-pressure designs, for example, need different nozzles, and nozzle-mix torches use their own type too.Check the torch maker's list for your model or the markings on your old nozzle. Do not force a nozzle that does not fit or mix parts from different makers, because it can leak or cause a flashback. If you are not sure, our team can help you identify the right one.
No. Nozzles are designed for a specific fuel gas, because the gases burn differently and need different amounts of oxygen and different port layouts. Propane and natural gas flames are cooler at the tip than acetylene but spread a lot of heat over a wide area, which is why propane is popular for heating.Using a nozzle with the wrong fuel gas can give a poor or unstable flame, wastes gas and may be unsafe. Match the nozzle, torch and regulators to your gas, and use the maker's recommended pressures.
Check that the nozzle seat and the thread are clean and undamaged, then fit the nozzle and tighten it snugly, by hand or with the correct spanner as the maker instructs. Do not overtighten, and never use sealing compound, tape or grease to stop a leak.With the torch unlit, turn on the gases and check around the nozzle and the torch connections with a leak detection fluid made for the purpose. A leaking seat can lead to popping and backfires, so fix any leak before you light the torch.