Micro-beam plasma welding machine adopts plasma arc welding current less than 30A, and its arc form is combined arc, that is, the dimensional arc and the working arc exist at the same time. When the weld gap is slightly larger, the weld reinforcement is insufficient or the weld is concave, it means the welding If the seam metal is insufficiently filled, the editor of Duomu Industry recommends that filler wire should be used. Filler wire should be a special welding wire with the same composition as the base metal, or edge strips cut from the base metal.
Do not move the micro-beam plasma welder immediately after the transfer arc is generated. Keep the base material in place for a certain period of time to melt the base material. After the molten pool is formed, start filling the wire and moving the welding torch. The center of the weld center and the weld to be welded are required to be centered, and the deviation should be Keep it as small as possible, otherwise it will cause welding deviation or undercut. In short, micro-plasma arc welding has energy concentration, high temperature, fast welding speed, stable arc, strong weldability, and the welding torch stays in the welding seam for a few seconds to protect the gas Continue to protect high-temperature welds and prevent oxidation. In short, micro-beam plasma arc welding has the characteristics of concentrated energy, high temperature, fast welding speed, strong weldability, good arc stability, and good weld quality.
In order to obtain a micro-beam plasma arc, a micro-beam plasma welding machine must meet three basic conditions.
(1) Micro-beam plasma arc generator is a device that generates micro-beam plasma arc, also called plasma gun, composed of plasma arc chamber. The first element to generate micro-beam plasma arc is to have a good plasma gun Requires no air leakage, no water leakage, no leakage, electrode alignment, adjustment and replacement are easy, the nozzle is durable and easy to replace.
As the power supply of the micro-beam plasma welding machine, the DC power supply should meet the following requirements in addition to the requirements of the general plasma arc DC power supply: reduced volt-ampere characteristics, fine-tuning of current, etc.: high voltage. Due to micro-beam plasma welding The machine current is small, the arc gas medium particles ionize, and the launching force is weak. In order to facilitate arc ignition and arc stabilization, it is necessary to increase the no-load voltage to enhance the field emission effect. Therefore, the power supply of the micro-beam plasma welding machine needs to be specially designed and manufactured. Use micro-beam In the plasma arc welding power supply, the positive connection method is adopted. The tungsten electrode of the welding torch is connected to the negative end of the power supply, and the other end of the power supply is connected to the nozzle of the welding torch through a contactor switch. At the same time, the positive polarity of the power supply needs to be connected in parallel The circuit is connected in parallel with the workpiece through the contactor.
(3) The inert gas source is in the arc chamber of the plasma welding machine, and the arc column forms a plasma arc under three types of compression. Two of the functions are inert gas. The inert gas used by the micro-beam plasma welding machine is generally All are argon, just use industrial bottle to compress argon. When in use, a pressure reducing gauge and a flow meter should be connected to finely adjust the two parameters of pressure and flow.
