(5) Efficiency reflects the utilization of power. The detection system realizes the synchronous measurement of the input and output power of the welding power source, reduces the influence of the fluctuation on the measurement, can observe the change of the efficiency under different load conditions, and improves the detection precision while researching and developing high efficiency. New welding power sources and an understanding of the utilization of electrical energy have been of great help.
(6) Networked measurement and control is an important application of network technology. The widespread use of the current Internet makes remote information sharing a reality. Based on the ultra-remote operation mode of fieldbus and local area network, it can realize the work that needs to be inspected by the inspectors on the spot, such as calibration, calibration and fault diagnosis of the instrument. The detection system has provided the necessary technical support for the implementation of this application.
At present, this series of detection systems enables the detection of welding power sources to be continuously developed in the direction of precision, high efficiency, automation and informationization. It has been used in nearly 10 large-scale welding power production enterprises, testing institutions and schools in China. Further adapt to the specific needs of each user, and make a more personalized design to facilitate users.
3 The three generations of testing equipment mentioned above basically detect the static electrical parameters of the welding power supply. Only the third generation products have the function of detecting and analyzing the transient process of no-load-load, no-load-short circuit, but due to the simulation. The adjustment of the arc load is the contactor control, which has limitations in speed, and it is difficult to objectively describe and simulate the dynamic arc.
Usually, the arc welding process is often accompanied by short-circuit transitions, arc length changes, current pulses, and other factors such as wire feed speed changes. The ability of the welding power source to respond to these influencing factors is its dynamic performance, which is good. Bad is directly related to process performance and its stability. Therefore, dynamic performance is an important test content when comprehensively evaluating the performance and quality of welding power supplies. In the second part of the European standard EN 729, the requirements for the "integrated quality of welding equipment" have been proposed and the implementation cycle of the calibration welding equipment has been proposed. In order to meet this development needs, D. Rehfeldt of the University of Khan, Germany, developed a welding dynamic simulator, the fourth generation of arc welding power supply testing equipment.
The simulator outputs dynamic parameters by function generator, and uses a set of high-speed nonlinear high-power electronic switch circuit to describe and simulate dynamic arc. The industrial computer collects and processes the output response of the welding power source, and the welding analyzer matched with the system. Data files for statistical charts and test results are automatically generated. In addition, it can easily detect the welding power source remotely using a local area network or the Internet. At present, Chengdu Sanfang Electric Co., Ltd. has signed a cooperation agreement with Hannover University of Germany to produce and sell the aircraft.
With the rapid development of welding manufacturing technology, the international welding standards are also changing with each passing day. The IEC 60974.10 standard has requirements for the EMC of welding power sources. The corresponding national standard will also be introduced soon. This will put forward new EMC testing for welding power sources. Testing tasks, how to develop and develop EMC testing equipment suitable for the research, production and testing of welding power supply is an urgent problem we need to solve.
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