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Straight answers on choosing, fitting and looking after the torch consumables for a 45 amp class plasma cutter.
Some torches are designed to accept the consumables of a smaller model in the same family, and parts rated for a lower current are often used when cutting thin metal at lower settings. That only works where the maker says the parts are compatible, so check the manual or consumable chart before mixing.Parts rated below the current you are actually cutting at will burn out quickly, and the reverse is also poor practice. Set the machine to a current that suits the consumables you have fitted, and use one matching set rather than odd parts from different current ratings.
Extended-reach consumables are longer than standard parts and have a narrow tip. They let you get into corners, channels, close edges and flanges, and give a clearer view of the line you are cutting or gouging. They can save a grinding or gas-cutting step on awkward jobs.The trade-off is heat: longer, slimmer parts cool less well, especially on an air-cooled torch, so they are best kept for jobs that need the access. They are made for particular torch designs, so check that the part is listed for your torch and current before ordering.
Gouging removes metal rather than cutting through it, for example taking out a weld or a bad joint. The nozzle has a larger opening than a cutting nozzle, which gives a wider, softer arc, and the torch is held at an angle to the work instead of upright. The shield is shaped to suit that technique and the spatter it throws.A gouging set is not a substitute for a cutting set. Fitting gouging parts for a straight cut gives a wide, rough kerf, so keep each set for its own job and check the maker's chart for the right parts for your current.
Many torches have a parts-in-place switch that stops the arc starting unless the retaining cap is fitted and seated. If you have just changed parts, check that the parts underneath are seated and in the right order, that the cap is on firmly by hand but not overtightened (a cap screwed on too tightly can also stop the torch firing), and that dirt or debris is not stopping the cap sitting down.If it still will not fire, check the manual for the fault indication on your machine. Never bypass or jumper the interlock, because it exists to stop the torch firing with the parts removed.