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Calculation of stresses in two- and three-dimensional structures generated by induction assisted laser cladding

: Brückner, F.; Lepski, D.; Beyer, E.

Ostendorf, A. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing 2009 : Proceedings of the Fifth International WLT-Conference Lasers in Manufacturing, LiM 2009, Munich, 15 - 18 June 2009
Stuttgart: AT-Fachverlag, 2009
ISBN: 978-3-00-027994-2
International Conference on Lasers in Manufacturing (LiM) <5, 2009, Munich>
Fraunhofer IWS ()
laser cladding; residual stress; Cracking; stress reduction; process simulation; finite element method

Laser cladding is successfully applied not only for the generation of wear and corrosion resistive coatings but also for the built-up of three-dimensional structures, e.g. in the repair of tools or turbine blades or in rapid manufacturing. Such structures consist of multiple single beads. The different thermal histories of the substrate and the various beads may lead to the development of high thermal stresses and sometimes even to the formation of cracks. The stresses depend on the properties of the materials involved and on the details of heat impact but also on the pattern of beads forming the structure. Inductive pre-heating appears as an appropriate tool to reduce the danger of cracking. Hence the development of thermal stresses and the thermal and mechanical interaction of overlapping beads within two- and three-dimensional structures during the induction-assisted laser cladding are studied with the aim to minimize dangerous tensile stresses.