In 1964, plasma welding technology was introduced into the welding industry as a way to better control the arc welding process in a lower current range. Today, the plasma retains the initial advantages it brings to the industry, it provides advanced control levels and precision to produce high-quality welds in micro and precision applications, and high production for various current levels. Plasma welding is also suitable for manual and automatic applications. It is used for various connection operations, from welding of small parts to welding of joints, to welding in mass production, and so on. A plasma is a gas that is heated to a very high temperature and ionised to become conductive. Similar tungsten arc welding (TIG) , The plasma arc welding process uses this plasma to transfer the arc to the workpiece. The metal to be welded is melted by the intense heating of the arc and fused together. In the plasma welding torch, the tungsten electrode is located on the copper nozzle with a small opening at the tip of the nozzle. Start the pilot arc between the torch electrode and the nozzle tip. The arc is then transferred to the metal to be welded. By passing the plasma gas and arc through the shrink hole, the torch transmits high concentrations of heat to a small area. With high performance welding equipment, the plasma welding process can produce very high quality welds. The plasma gas is usually ar. The torch also uses secondary gases that can be ar, ar/hydrogen or helium, which helps to shield molten weld puddles, thus minimizing oxidation of the weld. The following power supply is required for plasma arc welding: Plasma console ( Sometimes external, sometimes built-in); Water recycler ( Sometimes external, sometimes built-in); Plasma welding torch; And torch accessory kit ( Tips, ceramics, knife covers, electrodes and mounting instruments). Plasma arc welding has a series of features and advantages. Plasma arc welding has a protective electrode, which can reduce electrode pollution. This is particularly beneficial in welding materials, where gas is generated and an unprotected gtaw electrode is contaminated. Due to the arc shape and uniform heat distribution, the plasma arc welding joint has forgiveness in the arc length change. This leads to arc confrontation distance not as important as GTAW. Plasma arc welding provides good welding consistency and does not require AVC in 99% applications, even in the case of wire feeding. The arc transfer is mild and consistent, so it provides welding of flakes, filaments, and micro-components in which the harsh GTAW arc begins to damage the parts to be welded Providing a stable arc in welding can reduce arc drift, so the goal of arc welding is to get the welding tool close to the welding joint to achieve optimal heat dissipation. Only the minimum high frequency noise is used in plasma arc welding to start the pilot arc, so the plasma can be used more easily with nc control without fear that the arc start noise will cause burrs in any electrical equipment Another benefit lies in welding applications, including the sealing of electronic components in which GTAW arcstart causes electrical interference and may damage the electronic interior of the components to be welded. The ARC Energy in plasma welding can reach three times the TIGwelding, and at higher welding speed, the welding deformation is smaller and the weld is smaller. The welding time can be as short as 0. 005 seconds, is the ideal choice for spot welding of fine wire, while the precise welding time is combined with the precise moving device, providing a repeatable welding start/stop position for Weld welding. Low current arc welding (as low as 0. 05A) Allows the welding of miniature components and good control of the welding edges. The arc diameter selected through the nozzle hole helps to predict the weld size. The application of the plasma process can start the arc gently and consistently at the tip of the wire or other widget and carry out repeatable welding in a very short welding time. This is advantageous when soldering components such as needles, wires, light bulb filaments, thermocouple, probes, and some surgical instruments. When handling sealed medical and electronic components sealed by welding, the plasma process provides the following capabilities-1) Reduce the heat input of parts; 2) Weld near precision insulating seal; and, 3) Start the arc without the possibility of damaging the high-frequency electrical noise inside the electrical. The entire repair industry has sprung up to help companies that want to reuse components with minor gaps and dents due to misuse or wear. The ability of the modern microarc power supply to gently start the low amp power supply and perform maintenance provides users with a unique alternative to traditional maintenance and heat treatment. Both the micro- Repair of tools, molds and molds using TIG and micro-Plasma welding processes. For external edges, plasma treatment provides good arc stability and has less skill in controlling welding puddles. To reach the inside of the angular sand seam, The TIG process allows the tungsten electrode to extend to improve contact. In ribbon metal welding, the plasma process provides the ability to continuously transmit the arc to the workpiece and Weld to the edge of the welded joint. In automatic applications, long welds do not require arc distance control and the process also has less maintenance of torch components.
