Heat Transfer Analysis of Microwelding Using Tuned Electron Beam

• Author / Creator

  Gajapathi, Satya Sai

• 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.

• Subjects / Keywords

  • High power lasers--Thermal properties
  • Lasers in medicine
  • Laser welding--Thermal properties
  • Laser pulses, Ultrashort

• Graduation date

  Fall 2011

• Type of Item

  Thesis

• Degree

  Master of Science

• DOI

  https://doi.org/10.7939/R3N12V

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.