Experimental Approach To Eliminate Start/Stop
Defects In Laser Cladding
Author(s)
V. Ocelík, M. Eekma, I. Hemmati, M. Dutka
& J. Th. M. De Hosson
Abstract
Laser cladding represents an advanced hard facing technology for the deposition
of a hard and corrosion resistant layer of controlled thickness onto a selected area
of metallic substrate. When a circular geometry is required, the beginning and
the end of the laser track coincide. This could lead to the formation of irregular
microstructural features resulting in non-homogeneous properties. In this work a
few different experimental strategies are examined to find a suitable approach in
order to reduce this problem in the Start/Stop area. Laser cladding experiments
were performed using 3.3 kW IPG Fiber laser, 40 mm in diameter SS304 steel
substrate bar and two powders: Iron and Cobalt based. Standard metallographic
methods, Scanning Electron Microscopy equipped with EDS and microhardness
measurements were used to study the microstructure and properties inside the
laser track overlapping areas created by different cladding strategies. These
strategies were finally ranked according a few qualitative criteria and approaches
are found which are beneficial over a situation where no special care is taken for
the beginning and the end of laser clad track.
Keywords: laser cladding, microstructure, defects.
1 Introduction
Laser cladding is an advanced technique to deposit a thick coating onto a
substrate in order to create a surface layer with specific properties suitable for
certain applications. A high power laser beam is providing the heat source to
melt simultaneously the substrate and the additional material, which will make
up the coating, together. There are three different ways in which this additional
Keywords
laser cladding, microstructure, defects
Related Book
Other papers in this volume
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