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Heat Transfer Analysis of Microwelding Using Tuned Electron Beam Open Access


Other title
Laser welding--Thermal properties
Lasers in medicine
High power lasers--Thermal properties
Laser pulses, Ultrashort
Type of item
Degree grantor
University of Alberta
Author or creator
Gajapathi, Satya Sai
Supervisor and department
Dr. Patricio F. Mendez (Chemical and Materials Engineering)
Dr. Sushanta K. Mitra (Mechanical Engineering)
Examining committee member and department
Dr. Marc Secanell Gallart (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
Master of Science
Degree level
Assembling small scale components is a challenge faced especially by the micro-electronics and medical industry that are dealing with miniaturized components. The current laser and electron beam technologies cannot be used for welding below few hundreds of micrometers because the high heat intensity resulting from reduced beam diameters causes excessive surface ablation. The current research investigates volumetric heating using tuned electron beams as a key to successfully employ high intensity heat sources for welding at micron and possibly nano scales. A numerical model has been developed using state-of-art commercial finite element software to predict the temperature distribution near the moving volumetric heat source for given welding conditions. It is observed that process Peclet number of 100 and beam penetration twice that of the required weld depth are the optimal conditions for carrying out microwelding with least supply of heat input to the substrate and negligible surface ablation.
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