Ultrasonic generation by exciting electric arc: A tool for grain refinement in welding process

Abstract

Traditional ultrasonic generation ways can not be applied in welding process effectively. This letter introduced a way of ultrasonic generation by exciting electric arc. When electric arc is excited by high frequency current, it generates ultrasonic. Experiments showed that welding arc had broad band response characteristic and the main factor of ultrasonic intensity was the exciting current. With the ultrasonic treatment generated by exciting arc, effect of grain refinement was found in the Ti–6Al–4V welding joint. This method of ultrasonic generation is believed to have an extensive use in material processing.