中文摘要：

为了进行埋弧焊电弧的稳定性分析和焊接质量控制,建立了反映焊接过程中电弧燃烧与焊丝送进的动力学模型.把焊接电弧作为反馈量,将一个线性比例电路和驱动送丝机的Buck式DC/DC变换器组合在一起,形成一个机电一体的闭环系统,其中Buck式DC/DC变换器用脉冲宽度方式调制.整个闭环系统可以用一阶微分方程描述,该闭环也是进行系统控制的基础.文中还提出了一个与送丝机特性、电弧特性以及控制电路特性有关的复合时间常数,来作为反映系统自动调节速度的主要参数.分析结果表明,无论电弧电压uarc的初始值为多少,其最终都将达到一个设定值.

英文摘要：

In order to analyze the stability of welding arc and control the quality of submerged arc welding, this paper establishes a dynamic model to describe the burning of arc and the feeding of wire during the welding process. By using the welding arc as a feedback parameter, a linear proportional circuit and a Buck DC/DC converter are combined to form a mechatronic closed loop. The Buck DC/DC converter as the power supply for wire feeder is modulated via pulse-width modulation, and the closed loop as the fundament of system control is described by a differential equation. Moreover, a hybrid time constant considering the wire feeder, the welding arc and the electronic control circuit is presented as the major parameter reflecting the adjustment rate of the system. Analytical results show that, whatever the initial value is, the welding arc voltage Uare would reach a set value.