基于压电执行器的GMAW熔滴过渡控制

GMAW droplet transfer control based on piezoelectric actuators

熔化极气体保护焊(GMAW)作为一种高效灵活的焊接方法,已得到了广泛应用,但在精密焊接应用较少,其熔滴过渡不易控制、焊接过程不够稳定是限制其应用的主要原因。在此提出以施加机械力的方式使熔滴发生可控的过渡行为,设计了以DSP为核心的压电执行器的控制系统,采用等速送丝和快速回抽相结合的熔滴过控制方案。以响应速度快,频率高的压电执行器为基础设计了焊丝挤压回抽系统结构,实现了焊丝的送进回抽功能。在该系统的控制下,实现了同一电流下不同频率的熔滴过渡行为和对焊接过程熔滴尺寸的控制。

GMAW welding as an efficient and flexible method has been widely used,but less in precision welding applications, because it is difficuh to control droplet transfer and the welding process is not stable enough to limit. Therefore, this paper proposes a way of applying a mechanical foree to make controllable droplet transfer behavior occur,the actuator is designed to DSP core piezoelectric control system ,constant wire feed and fast withdrawing combination of controlling the droplet program. In response speed, high frequency piezoelectric actuator is designed based on the wire extrusion withdrawing mechanism to achieve a wire feed withdrawing fimction. Under the control of the system to achieve the droplet transfer behavior of different frequencies in the same current, can realize the welding process control droplet size.