Abstract

Structuring by remelting is an innovative approach for structuring metallic surfaces with laser radiation, where no material is removed but reallocated while molten. Based on this remelting principle an innovative structuring technique is investigated, where laser beams are superposed. A melt pool is generated by a cw laser beam with constant feed rate. A pulsed laser is superposed onto the cw laser and evaporates a small amount of molten material and, therefore, generates vapour pressure, which shapes the melt pool surface. The solidification follows this newly shaped surface. For this process a new optical system was designed and built up, which allows the combination of cw and pulsed laser beams.

© 2014 Optical Society of America

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References

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  1. A. Temmler, “Structuring by remelting,” Tailored Light [Book], Reinhart Poprawe, 203–207 (2010)
  2. A. Temmler, E. Willenborg, and K. Wissenbach, “Designing surfaces by laser remelting,” Proc. of 7th International Conference on MicroManufacturing. Evanston, 297 – 305 (2012).
  3. N. Pirch, S. Höges, and K. Wissenbach, “Mechanisms of surface rippling during laser polishing,” Proceedings of the 8. International Seminar on Numerical Analysis of Weldability. Graz-Seggau, 25–27 (2006)

Temmler, A.

A. Temmler, E. Willenborg, and K. Wissenbach, “Designing surfaces by laser remelting,” Proc. of 7th International Conference on MicroManufacturing. Evanston, 297 – 305 (2012).

Willenborg, E.

A. Temmler, E. Willenborg, and K. Wissenbach, “Designing surfaces by laser remelting,” Proc. of 7th International Conference on MicroManufacturing. Evanston, 297 – 305 (2012).

Wissenbach, K.

A. Temmler, E. Willenborg, and K. Wissenbach, “Designing surfaces by laser remelting,” Proc. of 7th International Conference on MicroManufacturing. Evanston, 297 – 305 (2012).

Other (3)

A. Temmler, “Structuring by remelting,” Tailored Light [Book], Reinhart Poprawe, 203–207 (2010)

A. Temmler, E. Willenborg, and K. Wissenbach, “Designing surfaces by laser remelting,” Proc. of 7th International Conference on MicroManufacturing. Evanston, 297 – 305 (2012).

N. Pirch, S. Höges, and K. Wissenbach, “Mechanisms of surface rippling during laser polishing,” Proceedings of the 8. International Seminar on Numerical Analysis of Weldability. Graz-Seggau, 25–27 (2006)

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Figures (6)
Fig. 1
Fig. 1 Schematic of assumed active principle for structuring due to vapour pressure.

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Fig. 2
Fig. 2 Scheme of process strategies to achieve structuring by remelting via vapour pressure resulting from localized vapourisation of molten material (onsight).

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Fig. 3
Fig. 3 Scheme of the optics for superposing three laser beams and a fast two-dimensional deflection for one laser beam relatively to the other (on-sight).

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Fig. 4
Fig. 4 Different superpositions illustrating the systems parameter range.

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Fig. 5
Fig. 5 Miscoloured plots in different resolutions mapped by WLI of a structured surface using the new vapour pressure process.

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Fig. 6
Fig. 6 Miscoloured plots of a structured surface mapped by WLI using strategy 2.

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Tables (1)

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Table 1 Postulated variables in the performance of the optical system

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