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Plain answers on choosing, fitting and looking after the wearing parts of a hand-held plasma cutting torch.
Start with the torch itself, not the cutter. Check the torch model and the parts diagram or consumable chart in the manual, then match the part numbers on your old parts to the chart. This matters most on a second-hand machine, where the torch may not be the one the machine originally left the factory with.Parts are normally rated for a particular cutting current, and a part rated lower than the current you cut at will burn out quickly. Do not mix parts from different torch types because they look similar. If you are unsure, our team can help you match a part number.
The electrode and nozzle usually wear first. A falling cut quality is often the first sign: a wider kerf, more dross on the underside, a ragged edge or an arc that is hard to start. Look at the nozzle for an orifice that is enlarged, out of round, nicked or melted, and at the electrode for pitting or a burnt, rounded tip.If cut quality is poor and the electrode and nozzle have been changed, the swirl ring is the usual next thing to check. Running parts until they fail can damage the shield cap and the torch head as well, so inspect them regularly rather than waiting for a failure.
The electrode has a small insert in its tip that wears into a pit. Makers publish a pit-depth limit for their electrodes, and the limit depends on the current the torch is rated for, so use the figure in your manual. Replace it sooner if the pit is off-centre, has rough edges or reaches past the insert.When you replace an electrode because of that wear, replace the nozzle at the same time. A new electrode in a worn nozzle often gives an unstable arc and poor cuts. Before checking or changing parts, switch off and isolate the machine as the manual instructs.
Often, yes. A shield cap that is undamaged can usually be cleaned of molten metal spatter and reused. Check the hole in the middle: if it is still round and the cap has no cracks, erosion or melted areas, it can go back on. If it is damaged, replace it.Use the cleaning tools the maker recommends, because the wrong tool can scratch or enlarge the parts. Clean the retaining cap and the seating faces too, so that the parts sit squarely and the gas cannot escape around them.
