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• W2887304407 abstract "Laser welding experiment with the aid of glass, and numerical simulation are carried out to study the keyhole behavior and keyhole-induced bubble formation. Two mechanisms are responsible for keyhole-induced bubble formation. The first mechanism is the strong fluid flow inside the weld pool, and the capillary instability of the whole keyhole, causing the collapse between rear keyhole wall and front keyhole wall. This mechanism contributes to most of keyhole-induced bubble formation. The second mechanism is the instability of the rear keyhole wall caused by the increase absorption of laser energy reflected by the bulge at front keyhole wall. The breaking of molten bridge is analyzed based on static pressure balance. The molten bridge with large curvature and low temperature is difficult to be broken. Bubble coalescence can be clearly observed at the bottom of the weld pool. Large bubble and small bubble have high coalescence efficiency. The bubbles at keyhole bottom have more time to escape without broken by laser beam, and the bottom part of rear keyhole wall is more easily depressed, so bubbles are easily formed at the keyhole bottom." @default.
• W2887304407 created "2018-08-22" @default.
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• W2887304407 date "2018-12-01" @default.
• W2887304407 modified "2023-10-16" @default.
• W2887304407 title "Elucidation of keyhole induced bubble formation mechanism in fiber laser welding of low carbon steel" @default.
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• W2887304407 doi "https://doi.org/10.1016/j.ijheatmasstransfer.2018.07.107" @default.
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