DIGITAL CONTROLLING FOR GMA WELDING

MACHINE BASED ON DSP

Hua Xueming  Zhang Yong  Wu Yixiong

(Shanghai Jiaotong University) 

Jiao Fujie

(Shanghai University of Engineering Science)

Yu Qianbo

(Nantong Sanjiu Welding Equipment Co.,Ltd)

Abstract: A welding machine for GMA using digital controlling method based on DSP (digital signal process) is introduced. By means of flexible programming according to welding technologies and experiences, the suitable characteristics of welding machine such as line compensation, welding voltage and current feedback, wire-feed driving, SCR trigging and so on, can be controlled and self-adjusted using digital signals. Through the designing based on DSP it is put out that the traditional hardware of control circuit is decreased greatly which can enhance the stability and reliability of welding machine. Finally, the welding experiments using CO2  shielding gas proves that the welding process is stable.

Key words: Digital signal process  Welding machine  GMAW

CLC No: TG434

Received 20030108, received in revised form 20030720