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Plain answers on the front-end wear parts of a hand-held air plasma torch: what each one does, how to tell it is worn and how to order the right ones.
The electrode has a small insert in its tip, and as it is used the insert erodes and forms a pit. The maker's manual gives the pit depth at which to change it, and the limit differs between torches, so do not rely on a number from elsewhere or on a set number of hours.A nozzle should have a round orifice with sharp edges. Change it if the orifice is nicked, oval or has rounded edges. A worn nozzle also shows in the cut: a wider kerf, a bevel on the edge, and a bevel that changes from one side to the other, which usually points to a failed nozzle.
Yes, treat them as a set. Plasma makers advise changing the nozzle and electrode together, because a worn part left in the stack can quickly damage a new one and spoil cut quality. Running an electrode past the end of its life is also one of the things that damages nozzles.The other parts last longer. The swirl ring, shield and retaining cap usually last through several electrode and nozzle changes, but look at them each time you change the set. Replace any that are cracked, damaged or clogged.
Consumables are made for particular currents, materials and applications, and mixing them up is a common mistake. A nozzle that is not suited to the current you have set can overheat and wear quickly, and running at a current that is too high for the parts is a known cause of nozzle damage.Most torches use different consumable sets for cutting, gouging and other jobs, so the manual tells you which combination to fit for each process. Check the part numbers and ratings in the manual rather than guessing from how the part looks.
A drag shield lets you rest the torch lightly on the metal and drag it along the cut, which protects and cools the nozzle and helps you keep a steady height by hand. A spacer or standoff guide is a separate fitting that holds the nozzle a set distance off the plate, for cutting without resting on the work.The shield's centre hole and vent holes matter: a damaged orifice or blocked vent holes cause problems and the part should be replaced. A cracked or bent spacer should also be replaced. Both are torch-specific, so check the manual for which fits.
