When the switching device breaks the circuit, if the circuit voltage exceeds 10~20V and the current exceeds 80~100mA, after the contacts are separated, a strong white light will be generated between the contacts, which is called an arc. Arc is an inevitable phenomenon in the switching process of the switching device. The essence of arc is a kind of gas discharge phenomenon, but it is different from other forms of discharge phenomena such as corona discharge and spark discharge. This article first introduced the characteristics and hazards of arc discharge, followed by the main reasons for the generation of arc and EDM, and finally elaborated the difference between EDM and arc discharge, follow the specific Xiaobian together to understand it. The two electrodes are electrically charged by a gaseous charged particle, such as electrons or ions, at a certain voltage. Excitation samples generate spectra. The arc discharge mainly emits atomic lines, which is a commonly used excitation light source for emission spectrum analysis. Usually divided into DC arc discharge and AC arc discharge two. Arc discharge is the strongest kind of self-sustained discharge in gas discharge. When the power supply provides higher power, the inter-electrode voltage does not need to be too high (approximately tens of volts), and the gas or metal vapor between the two electrodes can continuously pass a strong current (several amps to several tens of amps) and emit strong The brilliance produces high temperatures (thousands to thousands of degrees), which is arc discharge. Arc is a common thermal plasma (see plasma applications). (1) Low starting voltage and current value (2) Arc energy concentration, high temperature (3) The arc is a bundle of free gas with very light weight. It is very easy to bend and deform under external force. (4) Arc has good conductivity and high conductivity: (5) The arc consists of three parts: the cathode region (including the cathode spot), the arc column region (including the arc column, the arc flame), and the anode region (including the anode spot). (1) The presence of an electric arc prolongs the time during which the switching device breaks the faulty circuit and aggravates the hazard of the short circuit fault of the power system. (2) The high temperature generated on the surface of the arc will cause the surface of the head to melt and evaporate and burn the insulating material; the oil-filled electrical equipment may also cause fire and explosion hazards. (3) As arcs can move under the influence of electric power and heat, it is easy to cause arcing, short-circuiting, and injury, or cause an accident. (1) High-voltage breakdown, short-circuit of the wire, damage to the outer insulating layer of the insulated wire, and an arc-opening induction circuit generates arcing. (2) A large current blows the fuse melt. (3) The light is shaken and exploded, and the wire connection is loosened. Detailed explanation of the difference between EDM and arc discharge Arc discharge is due to insufficient deionization between electrodes, the discharge point does not disperse, multiple consecutive discharge in the same place formed, it is a stable discharge process, discharge, the explosive force is small, the amount of erosion is low. The spark discharge is a non-stable discharge process, with obvious pulse characteristics, large explosion force during discharge, and high erosion. The volt-ampere curve of the arc discharge is positive (ie, the current through the medium decreases as the inter-electrode voltage decreases), and the voltammetric characteristic curve of the spark discharge is negative (ie, as the inter-electrode voltage decreases. The current through the medium increases.) The shape of the arc discharge channel is conical, the anode and cathode spots are different in size, the anode spot is small, and the cathode spot is large. Therefore, the current density is also different. The current density of the anode is about 2800 A/cm2, and the cathode current density is 300 A. / cm2. Spark discharges are usually the same size as the drum anode and cathode spots. Therefore, the current density at the two poles is the same and very high, reaching 105 to 106 A/cm2 The temperature at the arc discharge channels and electrodes is approximately 7000-8000°C, while the temperature at the spark discharge channels and electrodes is approximately 10000-12000°C. The breakdown voltage of arc discharge is low, and the breakdown voltage of spark discharge is high. The amount of arcing in the arc discharge is low, but the cathode corrosion is more than the anode. In the spark discharge, in most cases, the anode is etched more than the cathode. For this reason, the workpiece is connected to the positive pole of the pulse power supply during EDM.
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