Abstract
An established analytical model is used to simulate an extended laser beam. Multiple Gaussian sources are superimposed to form a rectangular beam and results are compared with a single circular Gaussian source model as well as experimental results from a high power diode laser with a rectangular beam. Melt depth and melt pool profile and progression have been predicted by modeling, which are compared with experimental results from melting of Inconel 625. The model produced is shown to give a reasonable prediction of melt pool shape and can be usefully employed to help optimise overlap required for laser surface processing applications. The value of absorptivity used in the model can be used as a fitting parameter to optimise the match between experimental and predicted results.
Highlights
It is generally accepted that laser surface melting (LSM) can be used for improvement of material properties such as corrosion performance [1]
The model produced successfully predicts the trends of decreasing melt depth and the change in shape of melt pool with increasing laser beam traverse speed
The value of absorptivity used in the model can be used as a fitting parameter to optimise agreement between modelled and experimental results
Summary
It is generally accepted that laser surface melting (LSM) can be used for improvement of material properties such as corrosion performance [1]. As the extent of overlap increases so too does process time and cost. As the corrosion performance is very sensitive to inhomogeneities, significant overlap may degrade the corrosion properties [1,2,3]. To minimise process cost and any degradation in corrosion resistance, the laser parameters should be selected to produce the desired melt depth with minimal overlapping. These parameters can be selected either by experimental trials or, alternatively, by using an appropriate mathematical model
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