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To reduce longitudinal flexural deformations during the laser welding of Ti6Al4V thin plates, this paper presents a synchronous gas cooling method (SGCM) that uses liquid nitrogen-cooled argon gas with the laser source to actively control the cooling process during welding. Compared to the conventional welding, the dimension of the fusion zone (FZ) obtained with SGCM welding is the same, while the...
A sandwich method was used to observe the keyhole in deep penetration laser welding, which provided an effective way to analyze both the Fresnel and inverse Bremsstrahlung absorption. In the transparent metal-analog system, different densities of metal vapor, ionized atoms, and free electrons in the keyhole can be simulated by changing the thickness of aluminum films. The research results show that...
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