中文摘要：

将数字化控制技术、模糊控制方法、功率调节技术等应用于埋弧自动焊装备的研制中，以实现埋弧焊的自动化和智能化操作与运行．在深入分析埋弧焊工艺要求的基础上，引入电流双闭环控制，采用限制最小脉宽的方法，实现了一种恒流带外拖的埋弧焊电源外特性的稳定性．设计了基于80C320和80C552单片机双核处理器的埋弧自动焊控制器；采用模糊控制算法，将80C320用于电源外特性控制，80C552完成埋弧焊焊接过程的控制；控制器之间通过RS-485串行接口交换数据．实验表明，该埋弧自动焊装备具有操作控制简单、运行可靠、焊接过程稳定、起弧成功率高、成形好等优点．

英文摘要：

In order to implement the automatic and intellectualized operation of submerged arc welding, a digital device is developed by combining the digital control technology, the fuzzy control strategy and the power modulation technology. Then, based on the analysis of the technological requirements of submerged arc welding, the double closed-loop control mode and the limitation of the minimum pulsed width are introduced to realize the external cha- racteristics suitable for the submerged arc welding with outer-drawing current. Moreover, a controller with a dualcore processor is designed for the automatic submerged arc welding. In this controller, 80C320 and 80C552 singlechips are respectively used to control the external characteristics of the power source and the welding process via the logic control strategy, and the data are exchanged via the serial communication of RS-485. Experimental results show that the developed digital device is of operational convenience, running credibility, welding stability, high ignition rate and excellent molding effect.