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Permanent link (DOI): https://doi.org/10.7939/R3J38KW2J

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Experimental Measurements of Fall Voltages and Droplet Temperature in GMAW Open Access

Descriptions

Other title
Subject/Keyword
Welding
Droplet Temperature
Fall Voltage
GMAW
Potential Drop
Arc Physics
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
McIntosh, Cory L
Supervisor and department
Mendez, Patricio (Chemical and Materials Engineering)
Examining committee member and department
Murphy, Anthony Bruce (Commonwelath Scientific and Industrial Research)
Sydora, Richard (Physics)
Mendez, Patricio (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Welding Engineering
Date accepted
2017-01-26T15:39:16Z
Graduation date
2017-06:Spring 2017
Degree
Master of Science
Degree level
Master's
Abstract
Heat distribution measurements in Gas Metal Arc Welding (GMAW) were concurrently measured at the cathode and anode giving increased insight and prediction capabilities. A calorimeter and water cooled cathode were used to determine energy partitions in GMAW for various electrodes, currents, shielding gases, and waveforms. Fall voltage, droplet temperature, and thermal efficiency measurements were inferred from the heat distribution measurements at the cathode and anode. Secondary and less dominant voltage losses were directly measured or modelled. The simultaneous measurements of all voltage loss regions allowed the determination of arc column voltage potential. All fall voltage measurements were comparable with those found in literature. Measurements show overall cathode fall voltage is independent from current and waveform selection and appears to be the first time to be experimentally verified for both steel and aluminum. Overall cathode fall voltage was measured to be 12.7 V and 10.9 V for steel and aluminum electrodes respectively. Results indicate that arc composition and temperature could be influencing overall cathode fall voltages. Overall anode fall voltage was independent on current and waveform selection and averaged at 4.7 V and 6.1 V for steel and aluminum respectively. Droplet temperature results indicate that a minimum in temperature exists at the transition point between globular and spray metal transfer in a steel electrode. By modifying small amounts of CO2 in the shielding gas, droplet temperature can be lowered while still maintaining a similar deposition rate. Values of cathode and anode fall voltages were used to determine deposition rates with results correlating well with other literature. The experiments performed in this study were able to give consistent measurements when spatter was not an issue and were representative of typical GMAW parameters. Voltage loss and deposition rate calculations correlate well with other literature indicating that fall voltage and droplet temperature measurements are correct. These experimental results in conjunction with models will grant greater understanding and comprehension pertaining to metal transfer, droplet temperature, fume formation, deposition rates, and heat distribution in GMAW.
Language
English
DOI
doi:10.7939/R3J38KW2J
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. 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.
Citation for previous publication
McIntosh, C., Chapuis, J., and Mendez, P. F. Effect of Ar-CO2 Gas Blends on Droplet Temperature in GMAW. Welding Journal 95(8):273s-279s, 2016.McIntosh, C., and Mendez, P. F. Experimental Measurements of Fall Voltages in Gas Metal Arc Welding. Welding Journal (3), 2017 (Peer Review Accepted – Editing in Progress).

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