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Permanent link (DOI): https://doi.org/10.7939/R3N061

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Effects of Submerged Arc Weld (SAW) Parameters on Bead Geometry and Notch-Toughness for X70 and X80 Linepipe Steels Open Access

Descriptions

Other title
Subject/Keyword
CVN
Charpy V-notch
bevel weld
HAZ
toughness
linepipe steel
SAW
heat affected zone
X70
X80
submerged arc weld
bead-on-plate weld
fracture energy
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Pepin, Joel
Supervisor and department
D.G. Ivey (Chemical and Materials Engineering)
H. Henein (Chemical and Materials Engineering)
Examining committee member and department
A. Gerlich (Chemical and Materials Engineering)
P. -Y. Ben Jar (Mechanical Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2009-09-29T21:33:29Z
Graduation date
2009-11
Degree
Master of Science
Degree level
Master's
Abstract
For the manufacture of higher strength pipelines to be feasible, a better understanding of the effects of welding on toughness is necessary. Bevel submerged arc welds were performed on X80 grade steel. The subsequent Charpy V-notch (CVN) test results indicated that the notch placement in the various heat affected zone regions, and hence the bead geometry, affected the test results. A series of bead-on-plate (BOP) submerged arc welds then were performed on X70 grade steel plate to determine the effects of current, voltage, heat input, polarity, and waveform manipulation (i.e., balance, offset, and frequency) on both single and tandem weld bead geometry. A new bead profile characteristic, the SP ratio, is proposed to describe weld bead geometry, and its relationship with welding parameters is discussed. Sub-size CVN specimens, pulled from many of the BOP weld coupons, were then tested. The greatest subsize CVN fracture energies were achieved when the bead was produced using lower heat input, and when the bead profile possessed a greater SP ratio.
Language
English
DOI
doi:10.7939/R3N061
Rights
License granted by Joel Pepin (joel.pepin@gmail.com) on 2009-09-29T21:06:44Z (GMT): 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 the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein 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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