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High Seam Surface Quality in Keyhole Laser Welding: Buttonhole Welding

BIAS—Bremer Institut für angewandte Strahltechnik GmbH, Klagenfurter Straße 5, 28359 Bremen, Germany
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J. Manuf. Mater. Process. 2018, 2(4), 78; https://doi.org/10.3390/jmmp2040078
Received: 18 October 2018 / Revised: 8 November 2018 / Accepted: 12 November 2018 / Published: 14 November 2018
(This article belongs to the Special Issue New Findings and Approaches in Machining Processes)
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Abstract

Keyhole laser welding experiments with 1.5 mm thick aluminum sheets (EN AW-6082) were carried out with transversal beam oscillation and wire feeding. A circular cavity, which was named buttonhole, formed directly behind the laser spot at certain oscillation frequencies. The welding states “no buttonhole”, “unstable buttonhole”, and “stable buttonhole” were distinguished. The melt pool dynamics were experimentally analyzed and correlated with the resulting roughness and waviness of the seam surfaces. Criteria for stable buttonhole welding were derived. On the basis of the cavity radii relations, it is shown that capillary pressure conditions can explain the movement of the buttonhole with the process. View Full-Text
Keywords: laser welding; buttonhole welding; seam surface quality; melt pool dynamics; beam oscillation; welding of aluminum laser welding; buttonhole welding; seam surface quality; melt pool dynamics; beam oscillation; welding of aluminum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Schultz, V.; Woizeschke, P. High Seam Surface Quality in Keyhole Laser Welding: Buttonhole Welding. J. Manuf. Mater. Process. 2018, 2, 78.

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