Effect of carbon black on light transmission in laser welding of thermoplastics

It is important to describe the laser energy transmission and absorption in polymers properly when modeling heat transfer in laser transmission welding (LTW) of thermoplastics. This paper uses the Bouguer–Lambert law and an apparent absorption coefficient to describe the total laser energy attenuati...

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Published in:Journal of materials processing technology 2011, Vol.211 (1), p.43-47
Main Authors: Chen, Mingliang, Zak, Gene, Bates, Philip J.
Format: Article
Language:English
Subjects:
Absorption coefficient
Attenuation
Carbon black
Laser beam welding
Laser transmission welding
Light scattering
Mathematical models
Polyamide
Polyamide resins
Polycarbonate
Polycarbonates
Thermoplastic resins
Transmission
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description It is important to describe the laser energy transmission and absorption in polymers properly when modeling heat transfer in laser transmission welding (LTW) of thermoplastics. This paper uses the Bouguer–Lambert law and an apparent absorption coefficient to describe the total laser energy attenuation in scattering polymers with and without carbon black (CB). The model was validated using the measured transmittances as a function of part thickness for unreinforced polyamide 6 (PA6), glass fibre reinforced polyamide 6 (PA6GF) as well as amorphous polycarbonate (PC). A linear relationship between the (apparent) absorption coefficient and the CB level in polymers was observed experimentally for PA6, PA6GF and PC.
doi_str_mv 10.1016/j.jmatprotec.2010.08.017
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subjects Absorption coefficient
Attenuation
Carbon black
Laser beam welding
Laser transmission welding
Light scattering
Mathematical models
Polyamide
Polyamide resins
Polycarbonate
Polycarbonates
Thermoplastic resins
Transmission
title Effect of carbon black on light transmission in laser welding of thermoplastics
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