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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

A solution to the problem of weld bead geometry prediction

McGlone, John Conn January 1980 (has links)
No description available.
92

Profile monitoring and object recognition using image processing

Wu, Ji January 1992 (has links)
No description available.
93

Vision monitoring systems in arc welding

Clark, Stephen January 1988 (has links)
No description available.
94

Automatic control of weld penetration

Ainscough, D. M. January 1987 (has links)
No description available.
95

Sensors for the top face monitoring of weld pools

Bicknell, Andrew Keith January 1990 (has links)
No description available.
96

Object-oriented design for knowledge acquisition in expert systems

Curtis, Gary James January 1991 (has links)
No description available.
97

The structure, mechanical and corrosion properties of duplex stainless weldments

Elsherief, Ahmed Fathy Abd Elshafi January 1990 (has links)
No description available.
98

A study on the topology of ship plate distortion by neural networks

Yuliadi, Mochamad Zaed January 2001 (has links)
No description available.
99

A study of the butt fusion welding of thermoplastic pipes

Shillitoe, Stephen January 1988 (has links)
No description available.
100

Modelling Laser Light Propagation in Thermoplastics Using Monte Carlo Simulations

Parkinson, Alexander 27 September 2013 (has links)
Laser welding has great potential as a fast, non-contact joining method for thermoplastic parts. In the laser transmission welding of thermoplastics, light passes through a semi-transparent part to reach the weld interface. There, it is absorbed as heat, which causes melting and subsequent welding. The distribution and quantity of light reaching the interface are important for predicting the quality of a weld, but are experimentally difficult to estimate. A model for simulating the path of this laser light through these light-scattering plastic parts has been developed. The technique uses a Monte-Carlo approach to generate photon paths through the material, accounting for absorption, scattering and reflection between boundaries in the transparent polymer. It was assumed that any light escaping the bottom surface contributed to welding. The photon paths are then scaled according to the input beam profile in order to simulate non-Gaussian beam profiles. A method for determining the 3 independent optical parameters to accurately predict transmission and beam power distribution at the interface was established using experimental data for polycarbonate at 4 different glass fibre concentrations and polyamide-6 reinforced with 20% long glass fibres. Exit beam profiles and transmissions predicted by the simulation were found to be in generally good agreement (R2>0.90) with experimental measurements. The simulations allowed the prediction of transmission and power distributions at other thicknesses as well as information on reflection, energy absorption and power distributions at other thicknesses for these materials. / Thesis (Master, Mechanical and Materials Engineering) -- Queen's University, 2013-09-27 10:41:08.997

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