The heating body in the sapphire crystal growth unit is made of tungsten, which is the most critical soul component in the sapphire production process. The main material of the heating body is tungsten. Tungsten has a purity of 99.95%, a density of 19.3g/cm3, and a hardness of 69HRA Min. It is a hard gray-to-tin-white metal with a melting point of 3422°C. It is the highest of all metals and has the highest tensile strength (1650). °C). Due to its high melting point, tungsten metal has high purity, high density and excellent resistance to high temperature creep. It has been widely used in long-crystal heating bodies, tungsten-tungsten supports and connectors in sapphire growth furnaces. After the heating body is crystallized by using 5 to 6 furnaces, the tungsten and the metal materials such as molybdenum in the thermal field are sublimated in a high temperature environment of 2500 ° C and gradually deposited on the heating body tungsten rod, so that the diameter of the tungsten rod is gradually thickened, and the resistance is increased. It gradually became smaller and eventually was scrapped because it could not meet the production requirements. Or the sapphire crystal growth body is broken due to the brittleness of the heating body or improper operation. In summary, the sapphire crystal heater must be welded and repaired. The repair welding of sapphire crystal heating body mainly adopts tungsten inert gas shielded welding, which is commonly known as TIG welding in the world. Its working principle is to use strontium tungsten electrode, argon gas protection, current direct current connection. In order to reduce or eliminate current fluctuations caused by changes in arc length, power supplies with steep drop or constant current characteristics should be used. Tungsten gas shielded arc welding is a welding method in which a tungsten rod is used as an electrode and argon gas is used for protection. During welding, argon gas is continuously ejected from the nozzle of the welding torch, and a protective layer is formed around the arc to block the air to prevent it from being applied to the tungsten electrode, the molten pool and the adjacent heat-affected zone, thereby obtaining a high-quality weld. The advantage is that the heat source and the filler wire can be separately controlled, and the heat input can be easily adjusted, so that all-round welding can be performed. In addition, since the filler wire does not pass current, no splash is generated and the weld bead is beautifully formed. Compared with other welding methods, tungsten inert gas shielded welding has the following characteristics: (1) The visibility of the arc and the molten pool is good, and the welding parameters can be adjusted according to the condition of the molten pool during the welding process. (2) The welding process is easy to operate, without slag or very little slag. (3) The arc concentrates under the compression of the protective airflow, the welding speed is faster, the molten pool is smaller, the heat affected zone is narrow, and the weldment has little deformation after welding. Our welding tungsten heating body welding machine is an inverter DC argon arc welding machine (water-cooled welding torch). The inverter arc welding machine is a new type of high-efficiency and energy-saving DC welding power source. It adopts high-frequency pressurized arc ignition and pulse thermal arc ignition design. The arcing performance is good, the working voltage range is wide, the grid adaptability is strong, and the load continuation rate is high. It concentrates on the advantages of strong current passing through the transistor and high switching frequency of the FET. It is an ideal welding power source. In order to ensure the penetration of the tungsten rod, the tungsten tungsten tungsten electrode needs to be ground out before the welding. Solder powder must be used when soldering the heating body tungsten rod to the copper flange. The main materials of the solder powder are boron silicate, borax water soluble borax and brazing powder, and the welding current is about 350A. Since tungsten has a tendency to recrystallize and become brittle, it is necessary to use a high welding speed as much as possible. When welding tungsten, it is preferable to preheat the weldment to about 400 ° C to 500 ° C. During the welding process, the tungsten welding wire may or may not be filled according to the specific requirements of the heating body. The "current" in the control of the welding operation is the most important operating condition because it is related to the depth of penetration, the welding speed and the quality of the weld bead. Safety measures The argon arc welding work site should have good ventilation to discharge harmful gases and smoke. In the place where the welding workload is large, install several axial fans to exhaust the outside. The heating body should be well grounded. The welding gun cable and ground wire should be shielded with metal braided wire. When using the welding machine, work clothes, caps and gloves must be worn. Personal protection should be done to avoid arcing, burns or burns. With the rapid growth of the national economy,the contradition between the supply and the demand of energy is becoming more and more prominent in China. 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