In short, plasma cutting is a method of cutting electrically conductive metal, using high velocity ionized gas which is passed through a nozzle. This high pressured ionized gas, later turns into the plasma, conducting electricity from the plasma cutting torch to the work piece. Plasma heats and melts the material when it comes in contact with the work piece. Thus, the metal pieces are produced in a proper and a smooth way. Plasma cutting is considered the best tool for cutting steel and non-ferrous material; in fact it is widely used by the manufactures as well as by amateurs.
If you are thinking of buying plasma cutting equipments, you need to consider certain instructions at first. One of the major and important factors to consider is the thickness of the metal that is needed to be cut. Particularly, plasma cutters are rated on their cutting ability and amperage. And, if you are cutting metal with considerably less thickness, then it is good to use lower amperage plasma cutter.
Similarly, use higher amperage machines for cutting thicker metals. Although, the smaller amperage cutter is capable of cutting metals of any thickness, but the quality will lack in thicker metal cuts. Also, it is important to consider the optimum cutting speed of the machine before purchasing the cutter. Remember, that a machine with high amperage would cut the metal much more easily and faster than one with low amperage.
Moreover, in plasma cutters , pilot arc conducts high frequency electricity through the air. As this electricity interferes with the computers or some other equipments. So it is always considered wise to select lift arc method, because it reduces the problem of high frequency starting circuits. In addition, plasma cutting torches include several plasma cutting consumables that often require certain substitutes. Also, make sure to select a machine which is less consumable, as it would be cost effective and long lasting.
It is also good to make some test cuts with many equipments and make sure to check the quality of each cut before buying plasma cutter. Look for a cutter that offers a tight focused arc. Another thing that you can check is how far you can move and at the same time maintains an arc while lifting the plasma torch during cutting. A plasma cutter that provides a quick, positive transfer from the pilot to the cutting arc at large transfer height can be the best for getting better support during cutting process.