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- W4385522010 abstract "A tailored blank (TWB) is a blank for press forming in which multiple steel sheets are welded together. There is concern that TWB with hydrogen dissolved by laser welding may fracture at the weld bead if formed immediately after welding. The time required for hydrogen to be released from the weld bead tends to be longer for high-strength steel sheets. In order to estimate how long to wait after welding before forming, it is necessary to know the time dependence of the maximum hydrogen concentration in the weld. Therefore, Fick's two-dimensional diffusion equation was applied to the laser weld to obtain an analytical solution and to study the diffusion behavior of hydrogen. As a result, it was found that the analytical solution can accurately represent the hydrogen concentration distribution in the weld, including the high temperature state of the weld immediately after welding, and that the diffusion coefficient can be determined by regressing the logarithm of the measured average hydrogen concentration in the weld. Hydrogen diffuses from the weld metal to the heat-affected zone and partly to the base metal. Therefore, the determined diffusion coefficient is only phenomenological. It is also shown that once the diffusion coefficient is determined, the maximum hydrogen concentration at the center of the weld bead can be determined from the measured average hydrogen concentration. Furthermore, although extrapolating from experimental data, it is possible to estimate the initial amount of hydrogen dissolved during welding, and it is shown that the time evolution of the hydrogen concentration distribution in the laser weld can be completely described." @default.
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- W4385522010 date "2023-01-01" @default.
- W4385522010 modified "2023-09-30" @default.
- W4385522010 title "拡散方程式の解析解を用いたレーザ溶接部に残存する水素量の解析" @default.
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- W4385522010 doi "https://doi.org/10.2207/qjjws.41.225" @default.
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