Relationship of laser absorption to keyhole behavior in high power fiber laser welding of stainless steel and aluminum alloy

By Y. Kawahito, N. Matsumoto, Youhei Abe, S. Katayama. 2011

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Effect of Laser-Matter Interaction on Molten Pool Flow and Keyhole Dynamics (2019, methodology): “The measurements using calorimetry [18, 19] or the integrated sphere method [20] have clearly revealed that the total laser absorption is noticeably increased when a keyhole is formed and that the increment in absorptivity”
Welding of Aluminum Alloys to Steels: An Overview (2014, unknown): “In an interesting research [46], a 10 kW fiber laser with a tightly focused spot diameter of 200 μm was employed to join a stainless steel (304) and aluminum alloy (A5052).”