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为提高焊接自动化程度和焊缝质量，研制了以ＭＣＳ－５１刊单片机为核心的弧长自动跟踪和自动接触引弧控制系统．该系统利用数理统计法进行弧长采样，省略了采样电路中Ａ／Ｄ转换环节，使控制系统不仅有良好控制性能，而且结构简单，抗干扰能力强．采用计算机控制的自动接触引弧技术，引燃可靠，钨电极污染极小，并避免了高频高压引弧对电子线路和环境的危害．
In order to improve the degree of welding automation and the quality of the weld, an arc length automatic tracking and automatic contact arc control system based on MCS-51 single-chip microcomputer was developed. The system uses mathematical statistics for arc length sampling, omitting the A / D conversion circuit in the sampling circuit, so that the control system not only has good control performance, but also has the advantages of simple structure and strong anti-interference ability. The use of computer-controlled automatic contact arc ignition technology, reliable ignition, tungsten electrode contamination is minimal, and to avoid the high-frequency high voltage arc on the electronic circuit and the environmental hazards.