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Metals 2018, 8(8), 650; https://doi.org/10.3390/met8080650

Minimization of the Thermal Impact in the Laser Welding of Dissimilar Stainless Steels

UPM Laser Centre, E.T.S. Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, 2. 28006 Madrid, Spain
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Received: 21 July 2018 / Revised: 13 August 2018 / Accepted: 16 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Laser Welding of Industrial Metal Alloys)
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Abstract

Laser welding of dissimilar stainless steels is of interest when mechanical, corrosion, or esthetical requirements impose the use of a high-performance stainless steels, while production-cost requirements prevent using expensive materials in all the parts of a given device. The compromise may lead to the use of the most expensive material in critical areas and the cheapest one in the remaining. Their union can be materialized by laser-pulsed welding. It has intrinsic difficulties derived from the different physical and chemical properties of the steels, and from the need of preserving the protective passive layer. The present work achieves a welded joint with minimum thermal impact by means of laser pulses, capable of preserving the corrosion resistance of the involved stainless steels. The influence of the parameters to define static and dynamic pulses on the material and on the welding regime, keyhole, or heat conduction, is studied. It is used to calculate the overlapping factor of the pulses on the basis of the real dimensions of the melted area. A continuous joint has been built with dynamic pulses. The corrosion resistance of it has been checked showing a similar behavior to the non-heated material. The microstructure of the optimized joint is associated with a reduced HAZ while its mechanical behavior is suitable for its real application. View Full-Text
Keywords: corrosion; laser welding; laser pulses; dissimilar steels; stainless steel corrosion; laser welding; laser pulses; dissimilar steels; stainless steel
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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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Cordovilla, F.; Tur, A.; García-Beltrán, Á.; Diaz, M.; Angulo, I.; Ocaña, J.L. Minimization of the Thermal Impact in the Laser Welding of Dissimilar Stainless Steels. Metals 2018, 8, 650.

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