In the welding process, two pieces of weldments were used with a thickness of 15 mm. A welding current of 80 A was applied, and during the welding, the arc length was manually adjusted. The system operated in the arc starting, uphill, and pulse current sequence mode. It responded quickly to the measured waveform throughout the process.
From the observed waveform, there was no overshoot, and the response time was fast. The maximum current fluctuation did not exceed 1 A, indicating a small error margin. The arc exhibited good elasticity, stable combustion, and excellent welding performance.
Additionally, the switch-type current output waveform had an angular shape, with a set switching frequency. The peak value of this angular waveform depended on the time constant frequency and pulse width of the welding circuit. When the output welding current waveform changed at a low frequency, all low-frequency pulse waveforms carried the angular waveform controlled by the switching signal, resulting in a current waveform with a frequency of 20 kHz. Therefore, this low-frequency carrier pulse arc also possessed characteristics similar to those of a high-frequency arc.
In conclusion, the output current of the inverter power supply for arc welding is regulated using a switching control method. This approach ensures no overshoot and provides a fast response. It enables stable arc combustion and high stiffness. Whether using DC or low-frequency pulse current, the welding arc exhibits high-frequency characteristics, which can significantly improve welding quality.
The use of a microcontroller-based system meets the requirements for arc control. It offers advantages such as low cost, flexible control, and high reliability. The user interface is designed with clear Chinese characters, making it 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. These studies contribute to the development of more efficient and precise welding systems.
Wu Xianping and others have researched the design of inverter-type hand welding machines. Their work has helped advance the field of power electronics and welding technology.
Experts in the field, such as Wu Lin and Lin Shangyang, have actively participated in promoting welding technology in China. They have engaged in academic exchanges and collaborations with international organizations, including the American Welding Society.
In January 2000, the President of the American Welding Society visited Kazakhstan. He was warmly received by officials from the China Welding Society, including Wu Lin, Lin Shangyang, Zhang Yanmin, and Park Dongguang. During the visit, they exchanged views on the development of the China-US Welding Society and signed a new bilateral agreement in April 2000 to strengthen future cooperation.
Mr. Fengshan, the President of the American Welding Society, also visited the Harbin Sino-German Welding Technology Training Center and the State Key Laboratory of Modern Welding Technology at Harbin Institute of Technology. He praised the progress made in China’s welding technology and acknowledged its advanced capabilities.
This visit highlighted the growing influence and technological achievements of China in the welding industry.
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