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Permanent link (DOI): https://doi.org/10.7939/R3XW4Q

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Heat Transfer and Calorimetry of Tubular Ni/WC Wires Deposited with GMAW Open Access

Descriptions

Other title
Subject/Keyword
GMAW, Nickel, Tungsten Carbide, Calorimetry, Droplet Temperature, Droplet Heat Content, Metal Transfer
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Scott, Kevin
Supervisor and department
Dr. Patricio Mendez (Chemical and Materials Engineering)
Examining committee member and department
Dr. Sushanta Mitra (Mechanical Engineering)
Dr. John Nychka (Chair)(Chemical and Materials Engineering)
Dr. Adrian Gerlich (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-07-11T20:21:57Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
A calorimeter for the deposition of metal during free-flight GMAW was developed for the purpose of measuring droplet heat content in Ni/WC tubular wires. By approximating the thermal gradients within the calorimeter to be second order polynomials the energy transferred to the calorimeter by the droplets was accounted for with more accuracy than previous investigations. Testing with 1.2 mm (0.045 in.) ER70S-6 steel wire agreed with previous studies and confirmed a minimum droplet temperature in the transition between globular and spray transfer. Arc characteristics of the Ni/WC consumable were unstable and the transition from globular to spray transfer was gradual without a distinct demarkation. For a 1.6 mm (0.0625 in.) tubular wire manufactured by H.C. Starck droplet heat content reached a minimum at approximately 190 A using a voltage setting of 26.9 V, 172 in/min wire feed speed, 12.5 mm (0.5 in.) electrode extension and 12.5 mm arc length. Subsequent bead-on-plate trials indicated increased carbide survival at the minimum droplet heat content compared with a similar overlay at non-optimum parameters. Small, polygonal secondary carbides were nucleated indicating dissolution and re-precipitation occurred even at the optimum parameters.
Language
English
DOI
doi:10.7939/R3XW4Q
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File title: Chapter 1 : Introduction
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