Integrated Test System For Modern Welding Equipment

Modern welding equipment is the contravariant welding machine applying more and more widespread. Welding power supply testing equipment for arc welding power source is the is necessary to completely cognize the performance of arc welding power supply. Based the demand to deeply congnize the performances of arc welding power supply, some researches on test of electric parameters of arc welding power supply are made, and a test system to test AC/DC arc welding power supply have been developed. Some measurements and analyses of the electric parameters of arc welding power supply have been done using this system.The system is based on virtual instrument technology, and integrating many new technologies including the technology of digital, computer, control, and test. Hall sensor gathers welding machine's voltage electric current signal, after a signal conditioning, through the data acquisition card, the industrial control computer tested welding machine's electrical parameter finally. A fully functional test software has been developed , to analyse and process the raw data, and display in the form of graphics and text emerged. Measurement system not only can measure the outer and dynamic characteristics and static electric parameters , but also has waveform display, automatic load regulation, automatic testing and information management features, and the dynamic characteristics of a welder evaluation, input parameters such as voltage and current harmonic analysis function. The system not only can measure the outer and dynamic characteristics and static electric parameters, but also can measure three-phase power factor, input harmonic current and frequency spectrum, and efficiency of arc welding machine.For the needs of the dynamic evaluation of CO₂ arc welding power supply, dynamic characteristics test technology is integrated at. home and abroad currently, the statistical method is used to reasearch the relationship between the quality of welding and dynamic characteristics of the welding parameters. Through a great deal of welding experiments, it shows that the use of statistical methods can be qualitative analysis of the stability of the welding process, but can not accurately assess CO₂ arc welding power dynamic characteristics. In the welding of technology, the lack of uniform standards and effective means, the need for CO₂ arc welding power of the dynamic method of assessing the conduct in-depth studies to identify accurately assess CO₂ arc welding power dynamic characteristics of the new methods and targets. In the welding parsing technique domain, the unification the standard and the effective method still lack, it needs to conduct the deep research to the CO₂ arc welding power source's dynamic characteristic evaluation method, seek new method which can evaluate the CO₂ arc welding power source dynamic characteristic accurately.Harmonic is a characteristic of power electron device. As the main power inverter welder after several rectifiers inverter circuit , harmonic problem is much serious. In order to research the characteristics of harmonic of arc welding power supply. The module to analyze frequency is based on FFT. In this system, we can observe and record get the harmonic amplitudes, as well as power factor, waveform distortion rate. And the various types of welding machine have been tested actually, to deepen understanding of the welding machine harmonic characteristics.A large number of experiments was carried out in the welding machine test system, which indicated that it definitely meet test automation requirement in the present welding machine production line. The system's stability and practicality have been verified. At the same time welding characteristics and harmonic mobility has done a lot of research and experiments, and deepened understanding of the dynamic characteristics of arc welding power. In theory and practical application, there is of great significance.