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(1) The use of the MIG welding process of AC pulse arc for the welding of aluminum alloy sheets in the industrial field has not been accepted because the research work is not sufficient, or because the welding power source is too old. A newly developed microprocessor-controlled inverter welding power supply for large-scale production. The research includes determining the characteristic parameters of the equipment, such as: welding wire, welding rod deposition rate, weld formation, weld width error, heat input, temperature change and deformation of the base material. Not only how to select the welding current and pulse period, but also the possibility of a fast transition between different processes (DC pulse arc welding and MIG welding of low frequency pulse arc) is discussed.
(2) The AC power supply equipped with the "smart" commutator mainly consists of four components: an electronic power supply with constant current characteristics, an intelligent rectifier, a high-frequency pulse ignition device for starting welding, and a control system developed according to the virtual mechanical principle. When the polarity phase of the electrode needs to end, the virtual controller's advanced control system can issue a request to change the polarity to the "smart" commutator, trigger the necessary control system of the H-bridge commutator, and wait for the sensing device. Determined commutation conditions.
The virtual machine uses the expert system database to specify the boundary conditions of the "smart" commutator. These conditions are: the trigger point for requesting a change in polarity, the reference value for polarity change, and the initial current for polarity change. After the polarity is changed, the commutator feeds this back to the virtualizer, allowing the process to continue with the desired waveform and new polarity. The current half-wave waveforms thus set are independent of each other, and the initial waveform of the AC power source is not affected by the polarity replacement; or, the initial stability of the arc is not affected. The average current to achieve the lowest process can be stabilized at 7A without affecting the operation of the machine. The quality of the weld is very good, the weld is uniform, the edges are free of defects, and the splash is minimal.
(3) The virtual machine is a solution that can be used in various arc welding machines. Because of its flexibility and ability to adapt quickly, it is suitable for existing, new and future welding processes. Programming is done in a high-level language for soldering technology with a small amount of instructions. It is based on an expert system that includes a large database that uses a specialized editor to translate the contents of the virtual machine and transfer it to the real machine in the shortest possible time. As a result, the welder can develop, test and optimize the new weld in a matter of hours. Process. The operation is simple, requiring only the deposition rate, material, shielding gas and the diameter of the wire or electrode, thus creating the power required for a variety of conventional arc welding processes. According to this principle, it can not only provide TIG DC/AC welder, but also AC/DC power supply for MIG/MAG pulse welding.
Latest developments in foreign welding technology (5)
Five, welding power