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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.
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.
Yes, used sparingly they can help keep a nozzle cleaner and prolong its life, because spatter sticks less readily and is easier to remove.Use only products made for welding torches and follow the maker's instructions. Keep the spray off the insulating part of the nozzle, as some products can break down the insulating material. Do not let any product get into the gas path in a way that contaminates the weld.