Adaptive interval model control of weld pool surface in pulsed gas metal arc welding

作者：Wang, Zhijiang^*; Zhang, YuMing; Wu, Lin

来源：Automatica, 2012, 48(1): 233-238.

DOI：10.1016/j.automatica.2011.09.052

• Arc voltage
• Weld pool surface
• Penetration depth
• Weld penetration
• Predictive control
• Interval model control
• GMAW
• GMAW-P

A skilled welder may produce quality welds with a desired weld penetration depth based on his/her observation on weld pool surface. In a recent study the authors found that the arc voltage change during the peak current period in pulsed gas metal arc welding is a relevant measurement of the weld pool surface that can estimate the penetration depth. A system is thus developed to measure the arc voltage and control its change as output using the base current period as input and the necessity to use relatively complex sensors such as imaging systems is avoided. Analysis shows that the resultant process being controlled is time-varying, noisy, and nonlinear. After simplification into a linear system, an adaptive interval model control system has been designed. Experimental results confirmed the effectiveness of the adaptive interval model control algorithm and the developed control system.

• 出版日期2012-1
• 单位哈尔滨工业大学