Product Code: ICAL06_902

Phenomena of Welding with High-Power Fiber Laser
Authors:
Keisuke Kinoshita, JWRI, Osaka University; Ibaraki Japan
Masami Mizutani, JWRI, Osaka University; Ibaraki Japan
Yousuke Kawahito, JWRI, Osaka University; Ibaraki Japan
Seiji Katayama, JWRI, Osaka University; Ibaraki Japan
Presented at ICALEO 2006

A fiber laser with high-power density is receiving a great attention as a desirable heat source for the high-speed production of deeply penetrated superior weld beads with narrow width and reduced porosity. Therefore, this study was undertaken to obtain a fundamental knowledge of welding with a 10 kW class fiber laser with high power density. Plume, molten pool and keyhole behavior, and melt flows were observed through a high-speed video and an X-ray transmission real-time observation system. Penetration characteristics and the formation conditions of welding defects were established. It was confirmed that sound high-quality welds without porosity could be produced in Type 304 steel plate at high speeds. The reason was interpreted by considering a stable keyhole, plume ejection direction and melt flow direction in the molten pool.