Title :
Variable polarity TIG welding arc stability and its control
Author :
Fu, Qiang ; Yao, He-qing ; Xue, Song-bai
Author_Institution :
College of Mechanical & Electrical Engineering, Hohai University, Changzhou, China
Abstract :
Arc blowing out and current impacting at commuting often occur in variable polarity inverter TIG welding. Equivalent capacitors and inductors of the main circuit slower the current commuting speed and cause arc blowing out. Equivalent resistance of welding arc decreases suddenly and causes current impacting when DCEP (direction current electrode positive) is commuting to DCEN (direction current electrode negative). Appending coupling inductor to the second stage inverter circuit and using a pre-cutting PI control strategy can solve the problem of arc stability effectively.
Keywords :
Circuit stability; Couplings; Electrodes; Inductors; Inverters; Pi control; Welding; Variable polarity; arc stability; coupling inductor; pre-cutting PI control;
Conference_Titel :
Information Science and Engineering (ICISE), 2010 2nd International Conference on
Conference_Location :
Hangzhou, China
Print_ISBN :
978-1-4244-7616-9
DOI :
10.1109/ICISE.2010.5691843