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Laser remote-fusion cutting with solid-state lasers
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Image of FIG. 1.
FIG. 1.

Schematic view of the setup used in experiments for remote-fusion cutting. The diameter of the spot depends on the working distance , the diameter of the focal spot , and the focal length of collimation and objective lens. A cross jet protects the optics.

Image of FIG. 2.
FIG. 2.

Typical process schema. From left to right, the cutting velocity and laser intensity are increased with a constant increment. Phases 1 through 6 indicate different cutting (1, 3, 5) and welding (2, 4, 6) processes, respectively. The given values illustrate a representative sample for  = 1.8 mm and  = 8 kW (Ref. ).

Image of FIG. 3.
FIG. 3.

Cutting speed vs. average laser power density for different thicknesses of the press-hardened steel 22MnB5. Each dot stands for the actual cutting result. Two areas can be distinguished: subprocess A with a pushing melt ejection arises for low velocities and a medium laser power intensity, while subprocess B (see black bordered area) shows a dragging melt ejection at a higher speed (Ref. ).

Image of FIG. 4.
FIG. 4.

Cross-section of a laser-fusion cut into a 22MnB5 sheet of 1 mm thickness ( = 8 kW,  = 5 m/min,  = 770 m). The molten material resting in the kerf solidified in a circular cross-section due to surface tension. The dark vertical lines (see arrows) define the area of austenitization. Superimposed the kerf cross-section is the Vickers hardness measurement (red curve) (Ref. ).

Image of FIG. 5.
FIG. 5.

Snapshots taken of the melt ejection for subprocess A (a) and subprocess B (b). Positive and negative ejection is seen from one and the same steel of thickness  = 1.8 mm at a laser power of  = 8 kW. In (a)  = 3 m/min,  = 770 m, while in (b)  = 14 m/min, and  = 560 m (Ref. ).

Image of FIG. 6.
FIG. 6.

Angle of melt ejection vs. cutting speed.  = 1.8 mm,  = 8 kW,  = 770 m. Effective melt ejection is observed for the range 3 ≤  ≤ 11 m/min only (Ref. ).

Image of FIG. 7.
FIG. 7.

Cross-sections for the three cutting ranges ①, ③, and ⑤, as defined in Chap. III. 1. (a) ①: Cutting without directional melt disposal; (b) ③: Subprocess A: pushing melt ejection at low velocities; (c) ⑤: Subprocess B: dragging melt ejection at high velocities. Please again note the regime of austenitization (Ref. ).

Image of FIG. 8.
FIG. 8.

Longitudinal sections for subprocess A for similar parameters and , but different thicknesses: (a)  = 1.4 mm, (b)  = 1.8 mm, (c)  = 2.2 mm. The spot diameter increases with sheet thickness (Ref. ).

Image of FIG. 9.
FIG. 9.

Longitudinal sections for subprocess B for similar parameters , , and , but different thicknesses: (a)  = 1.4 mm, (b)  = 1.8 mm, (c)  = 2.2 mm (Ref. ).


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Specifications of the solid-state lasers used for laser remote-fusion cutting.

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Chemical composition of the press-hardened manganese boron steel 22MnB5 (Ref. ).

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Parameter range where remote-fusion cutting could be realized (Ref. ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Laser remote-fusion cutting with solid-state lasers