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Research Papers: Materials Technology

Fatigue Crack Growth at Electrical Resistance Welding Seam of API 5L X-70 Steel Line Pipe at Varied Orientations

[+] Author and Article Information
Craig Taylor

Centre for Engineering Research in
Pipelines (CERP),
University of Windsor,
Windsor, ON N9B 3P4, Canada
e-mail: taylor1z@uwindsor.ca

Sreekanta Das

Professor
Mem. ASME
Centre for Engineering Research in
Pipelines (CERP),
University of Windsor,
Windsor, ON N9B 3P4, Canada
e-mail: sdas@uwindsor.ca

Laurie Collins

EVRAZ North America,
Regina, SK S4P 3C7, Canada
e-mail: Laurie.Collins@evrazna.com

Muhammad Rashid

EVRAZ North America,
Regina, SK S4P 3C7, Canada
e-mail: Muhammad.Rashid@evrazna.com

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 19, 2016; final manuscript received November 24, 2016; published online March 28, 2017. Assoc. Editor: Jonas W. Ringsberg.

J. Offshore Mech. Arct. Eng 139(3), 031401 (Mar 28, 2017) (6 pages) Paper No: OMAE-16-1086; doi: 10.1115/1.4035385 History: Received July 19, 2016; Revised November 24, 2016

Very few studies have been conducted concerning fatigue in steel line pipe and fewer using full-scale testing. Further, at the time of this study, no research on full-scale testing was available in open literature regarding fatigue behavior of line pipe with longitudinal cracks, despite being considered more critical than the line pipe with cracks oriented in the circumferential direction. In the current research work, fatigue crack growth was investigated in NPS 20, API 5L X-70 grade, electrical resistance welding (ERW) straight-seam steel line pipes in the base metal and at the weld seam for various orientations. It was found that there was no significant difference between fatigue crack growth in the base metal and at the weld seam for the tested stress ratio. Increasing the angle of inclination of the crack with respect to the weld line was found to decrease the rate of fatigue crack growth due to a decrease in the mode I stress component. Finally, it was observed that despite the difference in fatigue crack growth rates, the crack aspect ratios were nearly identical for all cracks at the same crack depth.

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Figures

Grahic Jump Location
Fig. 2

EDM notch and fatigue crack

Grahic Jump Location
Fig. 3

SEM images of fatigue cracks

Grahic Jump Location
Fig. 4

Fatigue crack surface appearance (a) smooth crack surface of W0-230 K and (b) fissured crack surface of W45-625 K

Grahic Jump Location
Fig. 7

Crack aspect ratio

Grahic Jump Location
Fig. 8

Crack aspect ratio

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