scholarly journals Thermal Modeling in Composite Transmission Laser Welding Process: Light Scattering and Absorption Phenomena Coupling

2014 ◽  
Vol 611-612 ◽  
pp. 1560-1567 ◽  
Author(s):  
André Chateau Akue Asseko ◽  
Benoît Cosson ◽  
Fabrice Schmidt ◽  
Rémi Gilblas ◽  
Yannick Le Maoult ◽  
...  
Keyword(s):  
Light Scattering ◽  
Laser Welding ◽  
Analytical Model ◽  
Three Dimensional ◽  
Welding Process ◽  
Thermoplastic Composites ◽  
Field Calculation ◽  
Laser Beam Intensity ◽  
Welding Interface ◽  
Laser Welding Process

In previous studies [1, , we have presented a detailed formulation of a macroscopic analytical model of the optical propagation of laser beams in the case of unidirectional thermoplastic composites materials. This analytical model presented a first step which concerns the estimation of the laser beam intensity at the welding interface. It describes the laser light path in scattering transparent composites (first component) by introducing light scattering ratio and scattering standard deviation. The absorption was assumed to be negligible in regard to the scattering effect. In this current paper, in order to describe completely the laser welding process in composite materials, we introduce the absorption phenomenon in the model, in the absorbing material (second component), in order to determine the radiative heat source generated at the welding interface. Finally, we will be able to perform a three dimensional temperature field calculation using a commercial FEM software. In laser welding process, the temperature distribution inside the irradiated materials is essential in order to optimize the process. Experimental measurements will be performed in order to valid the analytical model.

scholarly journals Analytical and numerical modeling of light scattering in composite transmission laser welding process

2013 ◽  
Vol 8 (1) ◽  
pp. 127-135 ◽  
Author(s):  
André Chateau Akué Asséko ◽  
Benoît Cosson ◽  
Mylène Deleglise ◽  
Fabrice Schmidt ◽  
Yannick Le Maoult ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Light Scattering ◽  
Laser Welding ◽  
Welding Process ◽  
Transmission Laser Welding ◽  
Laser Welding Process

Segmentation of Molten Pool Infrared Images Using Morphology during High Power Disk Laser Welding

2012 ◽  
Vol 201-202 ◽  
pp. 91-94
Author(s):  
Yan Xi Zhang ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Molten Pool ◽  
Welding Process ◽  
Histogram Equalization ◽  
Welding Quality ◽  
Infrared Images ◽  
Traditional Methods ◽  
Disk Laser ◽  
Laser Welding Process

Configuration of a molten pool is related to the laser welding quality. Analyzing the configuration of a molten pool is important to monitor the laser welding process. This paper proposes a method of segmentation of a molten pool and its shadow during high power disk laser welding, consequently provides the groundwork for reconstruction of the molten pool and analysis of welding quality. Subsection linear stretching histogram equalization was applied to enhance the contrast of the original images firstly, and then edge detection was used to highlight the edges. After that we used the morphology filtering method to produce the segmentation mask, and then combined the mask with the original images to get the final segmentation results. Also, the proposed method was compared with other traditional methods. The experimental results showed that our method not only could give better segmentation results and process large quantities images automatically, but also overcame the less-segmentation problems of traditional methods.

Sign in / Sign up

Export Citation Format

Share Document