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- W2077643464 abstract "Mechanism of laser beam absorption was analyzed in key hole welding of thin plate and deep penetration welding of thick plate on the basis of the two-dimensional cavity model where beam is absorbed by cavity wall and ionized metal vapor. The beam absorptivity of the cavity wall A and the absorption coefficient of the plasma u are approximately 50 % and 1- 1.5 cm<sup>-1</sup>, respectively. In key hole welding of thin plate, laser beam is absorbed predominantly by the liquid cavity wall and the cavity shape is self-controlled so as to absorb the energy required for bead formation. In deep penetration welding of thick plate, laser power is absorbed mainly by plasma where the self-controlling is less effective, and hence excess energy absorbed at low welding speeds is w'sted to widen the bead with little increase in penetration depth. In vacuum of 10<sup>-3</sup>-10<sup>-4</sup> torr, u decreases down to approximately 0.5 cm<sup>-1</sup>, providing large penetration depth." @default.
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- W2077643464 date "1986-11-12" @default.
- W2077643464 modified "2023-09-23" @default.
- W2077643464 title "Beam Absorption Mechanism In Laser Welding" @default.
- W2077643464 doi "https://doi.org/10.1117/12.938878" @default.
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