Adaptive control system with constant frequency of droplet transfer for waveform controlled short-circuiting CO2 arc welding

作者：Zhu Zhiming^*; Wu Wenkai; Luo Xiaofeng

来源：Chinese Journal of Mechanical Engineering, 2001, 37(11): 81-84.

• Constant droplet transfer frequency
• Waveform control
• Welding power source

Considering the particular feature of short circuiting CO2 arc welding process, the output current waveform of welding power source is determined based on the characteristic of the output loop resistance during the period of droplet short circuiting with weld pool. The current waveform is in favor of eliminating the instantaneous contact of droplet with weld pool and enhancing the regularity of droplet transfer. An adaptive control system with constant frequency of droplet transfer is established after the droplet transfer frequency and the wire extension being detected in the real time. The control system is aimed at improving the stability of welding process which is realized by the feedback control of transfer frequency, and restraining the disturbance inducing by the variation of wire extension which is compensated through its feedforward. The basis of the system is an inverter type arc welding power source controlling by a microcomputer MC68HC11A1.

• 出版日期2001
• 单位清华大学