Welding process is a complex physical and chemical process containing arc sound,arc light, and electrical signal,etc.Each kind of signals provides important information for welding process control and quality control.As the concomitant of welding process,welding arc voltage and current signal contains rich information about arc and has a close relevance with arc behavior,metal transfer,stability of arc,welded joint quality and so on.It is an important information resource for studying the stability ...