The effect of graphite burn off on multi pass laser forming

Griffiths, Jonathan David and Edwardson, Stuart and Boegelein, Thomas and Dearden, Geoff and Watkins, Ken (2011) The effect of graphite burn off on multi pass laser forming. In: International Workshop on Thermal Forming and Welding Distortion, 6th-7th April 2011, Bremen, DE.

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Item Type:Conference or Workshop contribution (Paper)
Item Status:Live Archive

Abstract

A key factor that influences the degree of forming realised per pass in multi pass laser forming (LF) using infra red lasers is the burn off of an absorptive layer. Typically when laser forming metals with an infra red laser (e.g. CO2, λ = 10.6μm) an absorptive layer such as graphite is used to improve absorption for a defocused laser beam to ~80% from ~3%. This spray painted layer readily absorbs the incident radiation, burns at high temperature and transfers heat to the substrate. The overall absorption coefficient therefore depends on the thermal properties of the substrate. Per pass this layer will be degraded and will influence the absorption and hence bend angle achieved in subsequent passes. Through experimentation and simulation this paper investigates the influence of graphite coating degradation on multi-pass LF.

Keywords:finite element modelling, laser materials processing
Subjects:H Engineering > H300 Mechanical Engineering
Divisions:College of Science > School of Engineering
ID Code:14884
Deposited On:11 Sep 2014 18:51

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