Control of weld penetration depth using relative fluctuation coefficient as feedback

The monitoring and control of weld penetration in pulsed gas metal arc welding (GMAW-P) is considerably challenging, especially in field applications. The metal transfer and pulse current in GMAW-P complicate the identification of weld penetration. In previous studies, the authors found that both th...

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Bibliographic Details
Published in:Journal of intelligent manufacturing 2020-06, Vol.31 (5), p.1203-1213
Main Authors: Zou, Shuangyang, Wang, Zhijiang, Hu, Shengsun, Wang, Wandong, Cao, Yue
Format: Article
Language:English
Subjects:
Adaptive algorithms
Adaptive control
Business and Management
Coefficients
Condition monitoring
Control
Control algorithms
Control theory
Electric potential
Feedback
Gas metal arc welding
Ions
Machines
Manufacturing
Mechatronics
Penetration depth
Predictive control
Processes
Production
Robotics
Voltage
Welding
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Summary:The monitoring and control of weld penetration in pulsed gas metal arc welding (GMAW-P) is considerably challenging, especially in field applications. The metal transfer and pulse current in GMAW-P complicate the identification of weld penetration. In previous studies, the authors found that both the change in arc voltage during the peak current period and the average arc voltage during the peak current period can be used for condition monitoring of weld pool surface and thus for the estimation of GMAW-P penetration depth. In the present work, the relative fluctuation coefficient ( C RF ) of weld pool surface is proposed by combining these two signals to predict the weld penetration depth. Model predictive control using this coefficient as feedback is employed to control the penetration depth. The experimental results show that uniform weld penetration depth can be obtained by the adaptive control algorithm. The practice attempted in this work can be expected to be a candidate solution for GMAW-P penetration control, which is easy to implement in field applications.
ISSN:0956-5515
1572-8145
DOI:10.1007/s10845-019-01506-8