![]() An arc is struck between the tungsten electrode and the inner nozzle with the help of a high-frequency unit. The inner nozzle is connected to the positive terminal of the DC source. The tungsten electrode is connected to the negative terminal of the DC source. The non-transferred arc type PAW uses direct polarity (DCEN). In the first one, the arc is between the tungsten electrode and the nozzle, and in the second one, the arc is between the tungsten electrode and the workpiece. Due to its complexity of the process and high investment, it is yet to gain popularity. Plasma arc welding is an advancement of the gas tungsten arc welding process GTAW (TIG) and is comparatively a new process to the industry (patented in 1963). On plasma arc welding filler metal may or may not be required. The plasma arc welding process utilizes two inert gases one forms the plasma arc, and the second shields the plasma arc. The arc formed between the tungsten electrode and the machine nozzle is known as a non-transferred arc, while the arc formed between the tungsten electrode and workpiece is known as a transferred arc. The coreless induction furnace has no iron core passing through the inductor and is divided into a power frequency induction furnace, a triple frequency induction furnace, a generator set intermediate frequency induction furnace, a thyristor intermediate frequency induction furnace, and a high-frequency induction furnace.Plasma arc welding (PAW) is an arc welding process wherein metal joining is achieved by the generated heat from the arc created between a tungsten electrode and the welding machine nozzle or workpiece. The smelting cost is low, and the maximum furnace capacity is 270 tons. The electrical efficiency is over 90%, and the waste furnace can be used. It is mainly used for the melting and heat preservation of various cast iron, brass, bronze, zinc, and other metals. The core induction furnace has a core through the inductor and is powered by a commercial frequency power supply. The melting furnace is divided into two types: a core induction furnace and a coreless induction furnace. It is mainly used for melting special high-temperature materials, and also as a heating and control device for growing single crystals from the melt. The induction furnace is heated quickly, the temperature is high, the operation and control are convenient, the material is less polluted during the heating process, and the product quality can be guaranteed. When the AC frequency is increased, the induced current frequency is increased accordingly, and the amount of heat generated is increased. If the non-metallic material is heated, the material is placed in a graphite crucible. If the metal material is heated, it is placed in a crucible made of refractory material. Induction furnaces are generally classified into induction heating furnaces and melting furnaces.Īn electric furnace that heats material using an induced current generated by an induction coil. Induction furnaces have outstanding advantages in diathermy or smelting soft magnetic alloys, high resistance alloys, platinum group alloys, heat resistant, corrosion-resistant, wear-resistant alloys, and pure metals. In addition to being heated or smelted in the atmosphere, the induction furnace can be heated or smelted in a vacuum and a protective atmosphere such as argon or helium to meet special quality requirements. Under the stirring action of the alternating magnetic field, the composition and temperature of the material in the furnace are relatively uniform, the forging heating temperature can reach 1250 ° C, and the melting temperature can reach 1650 ° C. Under the action of the alternating electromagnetic field in the induction furnace, eddy currents are generated inside the material to achieve the effect of heating or melting. The main components of the induction furnace are sensors, furnaces, power supplies, capacitors and control systems. ![]() The induction furnace is an electric furnace that uses materials to induce electric heating effects to heat or melt materials. ![]()
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