The arc ignition methods of plasma cutting machine mainly include high-frequency arc ignition and high-pressure arc ignition. Generally, domestic plasma cutting machines use high-frequency arc ignition. Plasma cutting machines use low-power manual cutting. It is contact cutting (low power refers to the plasma with output current below 100A), that is, the torch cutting nozzle is close to the workpiece to initiate arc cutting, and the plasma cutting machine with a model above 100A (that is, the output current is above 100A, including 100A) is used Non-contact cutting, that is, cutting nozzle is 5~8mm away from the workpiece, and contact cutting has less high-frequency interference to the outside world during arc ignition than non-contact cutting.
Due to the limitation of technology and accessory materials, inverter plasma is basically based on plasma below 100A (including 100A). Of course, some manufacturers produce inverter plasma with 120A and 160A, but in actual use From a point of view, these products are still very immature and have many problems. Therefore, inverter cutting machines below 100A are generally used, mainly 40A, 60A (63A), etc., and a small amount of 20A, 80A, these low power Except for a small number of specially customized models, all plasmas are basically contact arc cutting, while inverter plasmas of 100A and above are all non-contact cutting. Low-grade cutting is also used for contact cutting, but the output current is below 100A), which has a large high-frequency interference to the outside world. Therefore, it is not that some inverter plasmas do not have high-frequency arc ignition, but have little external interference.