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Possible explanations for different surface quality in laser cutting with 1 and 10 μm beams
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10.2351/1.3672477
/content/lia/journal/jla/24/1/10.2351/1.3672477
http://aip.metastore.ingenta.com/content/lia/journal/jla/24/1/10.2351/1.3672477

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the striation generation process. (MA: melt accumulation, CF: central flow, LB: laser beam).

Image of FIG. 2.
FIG. 2.

The 2D model of kerf front profiles. Evolution of the profile depends on the sign of the stability function S(α) [see Eq. (7)], where α is the local inclination angle of the front. (a) When S(α) > 0, a concave mode can develop: the node B moves to the left from the line AC, and then the node D to the left from the line BC. (b) When S(α) < 0, an inversed convex mode develops as from the line AC to AB’C and then to AB’D’C.

Image of FIG. 3.
FIG. 3.

The angular dependences of the stability function S(α) [defined by Eq. (7)] for the two wavelengths of 1.06 and 10.6 μm.

Image of FIG. 4.
FIG. 4.

(a) The angular dependences of the absorptivity A(α) for the two wavelengths of 1.06 and 10.6 μm at T = T m (Ref. 18). (b) A model kerf profile in the case of the regime of humps.

Image of FIG. 5.
FIG. 5.

The 2D model of the striation generation process. The solid part is melted due to heat transfer from the MA sliding down along the kerf side wall.

Image of FIG. 6.
FIG. 6.

Temperature field inside the solid.

Image of FIG. 7.
FIG. 7.

Calculated R z ′ and u′ as a function of T′ for different values of b.

Tables

Generic image for table
TABLE I.

The complex refractive indices (n + ik) used in the calculation of the stability function S(α) (Ref. 18).

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/content/lia/journal/jla/24/1/10.2351/1.3672477
2011-12-30
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Possible explanations for different surface quality in laser cutting with 1 and 10 μm beams
http://aip.metastore.ingenta.com/content/lia/journal/jla/24/1/10.2351/1.3672477
10.2351/1.3672477
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