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Answers to the questions buyers ask when choosing, fitting and looking after replacement gas nozzles for MIG/MAG welding torches.
The gas nozzle is the shroud at the front of the torch. It guides the shielding gas around the contact tip, wire and weld pool so the molten metal is protected from the air. If the gas shield is poor, welds tend to show porosity.It is a wear part: spatter, heat and knocks gradually damage it, so spares are needed from time to time.
A straight (cylindrical) nozzle has the largest bore, which gives good gas coverage and tends to collect less spatter, but it gives the least access to a joint. A bottleneck nozzle narrows at the front for better access, which helps in tight corners and automated work. Tapered nozzles also improve access, but a long taper has a smaller bore and collects spatter more readily, so a short taper is usually preferred where it will do.The usual advice is to use the largest-bore nozzle that still lets you reach the joint, and to follow the torch maker's guidance.
Replace the nozzle when it is damaged or distorted, or when spatter sticks to it and cannot be removed properly. Damaged or worn insulation and worn seals or retaining rings, which let the nozzle shift or fall out, are also reasons to replace it.Other signs are porosity in the weld or an unstable arc. If you are replacing nozzles very often, look for a cause such as a bore that is too small for the job or a contact tip sitting in the wrong position.
Clean it regularly with a purpose-made nozzle reamer of the right size, taking care not to scratch or distort the bore. Remove the nozzle first and let the torch cool completely. Check for spatter sticking inside and for blocked gas ports before and after use.Do not hammer the nozzle against the bench to knock spatter out, as this can damage it and the torch. Spatter that has restricted the gas path can cause porosity, so do not leave cleaning until the nozzle is clogged.