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- W2896055685 abstract "Deep penetration laser welding is associated with depositing very high irradiation of a laser beam to a workpiece, resulting in drastic vaporization to form a slender capillary into the workpiece, denoted as a keyhole, as well as violent plasma generation which consists of metal vapor, ionized atoms, and free electrons. Plasma resides both outside and inside the keyhole, known as plasma plume and keyhole plasma, respectively. In this paper, we quantitatively characterize the plasma absorption of a laser beam inside the keyhole based on photodiode measurements and spectroscopic measurement. The results show that the plasma absorption of a laser beam cannot be neglected in certain welding conditions. Furthermore, this absorption mainly occurs in the top portion of the laser beam, resulting in a wider weld shape in the top portion of the weld bead.Deep penetration laser welding is associated with depositing very high irradiation of a laser beam to a workpiece, resulting in drastic vaporization to form a slender capillary into the workpiece, denoted as a keyhole, as well as violent plasma generation which consists of metal vapor, ionized atoms, and free electrons. Plasma resides both outside and inside the keyhole, known as plasma plume and keyhole plasma, respectively. In this paper, we quantitatively characterize the plasma absorption of a laser beam inside the keyhole based on photodiode measurements and spectroscopic measurement. The results show that the plasma absorption of a laser beam cannot be neglected in certain welding conditions. Furthermore, this absorption mainly occurs in the top portion of the laser beam, resulting in a wider weld shape in the top portion of the weld bead." @default.
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- W2896055685 date "2002-01-01" @default.
- W2896055685 modified "2023-09-26" @default.
- W2896055685 title "Quantitative characterization of keyhole absorption mechanisms in 20 kW-class CO2 laser welding processes" @default.
- W2896055685 doi "https://doi.org/10.2351/1.5066122" @default.
- W2896055685 hasPublicationYear "2002" @default.
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