Smart Processes Produced by Clarification of Fundamental Phenomena in Ultra-High-Power-Density Fiber Laser Welding

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The objectives of this research are clarification of fundamental phenomena and development of smart process in ultra-high-power-density fiber laser welding. As for the fundamental clarification, the laser absorption of SUS304 stainless steel achieved 80% and the absorption mechanism was revealed on the basis of X-ray high-speed pictures of the keyhole. With respect to smart process, laser adaptive control applied for continuous-wave fiber laser welding. Consideration of thermal storage effects led to success of stable sound welds at acceleration or deceleration in welding speed.