An overview of the self-organizing map algorithm, on which the papers in this issue are based, is presented in this article.

The Self-Organizing Map

An introduction to heat transfer

In the laser treatment of a workpiece (9), e.g. for surface hardening, melting, alloying, cladding, welding or cutting, the adverse effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1). The two beams (1)(5) may be combined by a beam coupler (4) or may reach the workpiece (9) by separate optical paths (not shown). The shorter wavelength beam (1) improves the coupling efficiency of the higher- powered laser beam (5).

Laser Material Processing

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Numerical Heat Transfer And Fluid Flow

Design, and Applications Shutao Wang,†,‡ Kesong Liu, Xi Yao, and Lei Jiang*,†,‡,§ †Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, and ‡Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, BeiHang University, Beijing 100191, People’s Republic of China Department of Biomedical Sciences, City University of Hong Kong, Hong Kong P6903, People’s Republic of China

Bioinspired Surfaces with Superwettability: New Insight on Theory, Design, and Applications

Numerical simulation of molten pool dynamics in high power disk laser welding

A computational analysis of laser keyhole welding is achieved. The main driving force to make the molten pool as a narrow and deep keyhole is the recoil pressure induced by evaporation of the material. Also, the multiple reflection effect on the keyhole wall plays an important role in making the keyhole deeper and raising its total energy absorption rate. Multiple reflection and Fresnel absorption are implemented simultaneously with the proposed ray tracing technique in a discrete grid cell system during the simulation for every single time step. In particular, the Fresnel absorption model is chosen as an energy transfer mechanism from laser beam to workpiece. With all the governing equations including continuity, momentum and energy equation, the VOF method is adopted to trace the free surface of the molten pool. Simulation results are compared with the experimental ones to verify its validity. A pulsed Nd : YAG laser was used for keyhole welding experiments on mild steel plates of 7 mm thickness. It was observed that the generated keyhole maintains its solidified shape without any closing phenomenon both in the experiments and in the simulations.

https://iopscience.iop.org/article/10.1088/0022-3727/39/24/039/pdf

Implementation of real-time multiple reflection and Fresnel absorption of laser beam in keyhole

https://web.mst.edu/~tsai/Published%20papers/Fan-IJHMT-2001-75.pdf

Heat transfer and fluid flow in a partially or fully penetrated weld pool in gas tungsten arc welding

Numerical study of alloying element distribution in CO2 laser–GMA hybrid welding

A study on the prediction of the laser weld shape with varying heat source equations and the thermal distortion of a small structure in micro-joining ☆

Suck-Joo Na

Papers

Numerical simulation of molten pool dynamics in high power disk laser welding

Implementation of real-time multiple reflection and Fresnel absorption of laser beam in keyhole

Heat transfer and fluid flow in a partially or fully penetrated weld pool in gas tungsten arc welding

Numerical study of alloying element distribution in CO2 laser–GMA hybrid welding

A study on the prediction of the laser weld shape with varying heat source equations and the thermal distortion of a small structure in micro-joining ☆