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| 001 | 491404 | ||
| 005 | 20250724152202.0 | ||
| 024 | 7 | _ | |a 10.2351/7.0000772 |2 doi |
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| 100 | 1 | _ | |a Chung, Woo-Sik |0 P:(DE-H253)PIP1093675 |b 0 |e Corresponding author |
| 245 | _ | _ | |a In-situ x-ray phase contrast observation of the full penetration spot welding on limited aluminum material thickness |
| 260 | _ | _ | |a Orlando, Fla. |c 2022 |b Laser Inst. of America |
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| 520 | _ | _ | |a The laser-spot welding process of aluminum alloy 1050A with a limited thickness is observed with the x-ray phase contrast method to investigate the melt dynamic especially when the melt penetrates the material. The laser-spot welding is investigated with two different wavelengths of the laser beam source: 515 and 1030 nm to investigate the influence of the absorptivity. The melt progressively penetrates the material during the spot-welding process until reaching the bottom side of the material and when the melt penetrates the lower side of the material, the so-called “lens-like” melt appears at the lower side due to the surface tension. At a comparable beam intensity value, the oscillation of the “lens-like” melt at the lower side of the material is driven by the expansion of vapor capillary. This expansion occurs inside of the material and directly above the “lens-like” melt. The shape of the expanded vapor determines the volume as well as the geometry of the resulting melt volume. Furthermore, the transition from the heat conduction welding mode to the keyhole welding mode is investigated by defocusing the laser beam for the beam source with a 515 nm wavelength. At a given variation, a clear difference between either mode is observed with the x-ray phase contrast method. |
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| 773 | _ | _ | |a 10.2351/7.0000772 |g Vol. 34, no. 4, p. 042019 - |0 PERI:(DE-600)2084611-3 |n 4 |p 042019 |t Journal of laser applications |v 34 |y 2022 |x 1042-346X |
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