Two pieces of weldments with a thickness of 15 mm were welded using a current of 80 A. During the welding process, the arc length was manually adjusted by the operator. The system operated in arc starting, uphill, and pulse current sequence modes. It responded to the measured waveform, which showed a stable and accurate performance.
The waveform displayed no overshoot throughout the process, with a fast response time. The maximum current fluctuation did not exceed 1 A, indicating minimal error. The arc exhibited good elasticity, stable combustion, and excellent welding performance.
Additionally, the switch-type current output waveform had an angular shape, operating at a set switching frequency. The peak value of this waveform depended on the time constant frequency and pulse width of the welding circuit. When the output current waveform changed during a low-frequency period, all low-frequency pulse waveforms carried the angular waveform controlled by the switching amount, resulting in a current waveform with a frequency of 20 Hz. Therefore, this low-frequency carrier pulse arc also exhibited characteristics similar to those of a high-frequency arc.
4. Conclusions: The output current of the inverter power supply for arc welding is controlled through a switching method. This results in no overshoot and a fast response, enabling stable arc combustion and high stiffness. Whether it is DC or low-frequency pulse current, the welding arc exhibits high-frequency characteristics, thereby improving welding quality.
The use of a microcontroller-based system allows for effective arc control, offering advantages such as low cost, flexible control, and high reliability. The system features a user-friendly Chinese interface that is easy to understand and operate according to standard procedures.
Reference: Zhao Jiarui. Inverter Welding and Cutting Power Supply. Beijing Machinery Industry Press, 1995.
Studies have been conducted on the external characteristics of arc welding power supplies controlled by single-chip microcomputers. Research has also focused on the design of inverter-type hand-welding machines and dual-purpose welding equipment. Experts in the field are engaged in teaching and research, specializing in power electronics, intelligent control, and computer hardware/software development. Several papers have been published in domestic core journals and other magazines.
In January 2000, the President of the American Welding Society visited Kazakhstan. He was warmly received by Wu Lin, former Chairman of the China Welding Society, Lin Shangyang, Secretary-General, Zhang Yanmin, and Deputy Secretary-General Park Dongguang. They exchanged views on the status of the China-US Welding Society and planned to sign a new bilateral agreement in Chicago in April 2000 to strengthen future cooperation. During the visit, Mr. Fengshan also toured the Harbin Sino-German Welding Technology Training Center and the State Key Laboratory of Modern Welding Technology at Harbin Institute of Technology. He praised China's advanced welding technology and acknowledged its rapid development. This visit helped enhance international collaboration in the welding industry.
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