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Metals 2017, 7(11), 452; https://doi.org/10.3390/met7110452

Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy

1
Laboratory of Advanced Materials Processing, EMPA-Swiss Federal Laboratories for Materials Testing and Research, Feuerwerkerstrasse 39, 3602 Thun, Switzerland
2
National Institute for Lasers, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele, Romania
*
Author to whom correspondence should be addressed.
Received: 13 September 2017 / Revised: 18 October 2017 / Accepted: 19 October 2017 / Published: 26 October 2017
(This article belongs to the Special Issue Laser Welding)
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Abstract

We report on a feedback mechanism for rapid identification of optimal laser parameters during welding of AlMg5 coupons using real-time monitoring by high-speed imaging. The purpose was to constrain the liquid movement in the groove in order to obtain pore-free welds in this otherwise difficult-to-weld alloy. High-speed imaging of the welding process via an optical microscope allowed for recording at millimeter level, providing new information on liquid-metal dynamics during laser irradiation as well as plausible explanations for spatter occurrence and pores formation. The pore formation and especially the position of these pores had to be controlled in order to weld 3 mm thick samples. By tuning both laser power and pulse duration, pores were aligned on a single line, at the bottom of the weld. A laser pass of reduced power on that side was then sufficient for removing all pores and providing a suitable weld. View Full-Text
Keywords: laser welding; spatter; liquid metal; high-speed imaging; porosity control laser welding; spatter; liquid metal; high-speed imaging; porosity control
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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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Popescu, A.C.; Delval, C.; Leparoux, M. Control of Porosity and Spatter in Laser Welding of Thick AlMg5 Parts Using High-Speed Imaging and Optical Microscopy. Metals 2017, 7, 452.

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