Overview of Tensile and Toughness Testing Protocols for Assessment of X100 Pipeline Girth Welds

Gianetto, J. A.; Bowker, J. T.; Dorling, D. V.; Taylor, David S.; Horsley, David; Fiore, Susan R.

doi:10.1115/ipc2008-64668

Cited by 3 publications

(2 citation statements)

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“…The percent elongation at fracture from strip tension tests for both X80 and X100 welds was low, i.e., under 10 percent. The uniform elongation, i.e., elongation at maximum load during the tests was also below what is usually expected [3], i.e., under 5 percent, in the case of the stress strain curves shown in Figure 6.49 and Figure 6.50. A contributing factor for this is flaws that were present in the test gauge length, as shown in Figure 6.51 and Figure 6.52.…”

Section: Discussionmentioning

confidence: 60%

“…The focus of this research was to modify current practices for extracting and testing All Weld Metal (AWM) specimens from a geometrically constrained girth weld. In a previous study [3], the strip specimen geometry was evaluated to determine the tensile properties of a GMAW cross section and it was then compared to the results obtained from the testing of a round bar Hounsfield specimen. It should also be noted that the strip specimen usually does not meet the gauge section dimensions of ASTM E8 [4] guidelines.…”

Section: All Weld Metal Tensile Testing Resultsmentioning

confidence: 99%

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Development of a Hybrid Laser Arc Welding System for Pipeline Construction

Begg¹,

Beynon²,

Hansen³

et al. 2008

2008 7th International Pipeline Conference, Volume 3

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The construction costs for a northern pipeline will represent approximately half of the project costs and will be extremely challenging with much of the work being carried out in harsh winter conditions at temperatures, as low as −55°C. The welding costs are a major component of the overall construction costs and industry continues to seek future generation pipeline welding technologies to achieve additional improvements in productivity and enable significant cost savings. The current state-of-the-art welding processes for onshore pipelines involve mechanized gas metal arc welding (GMAW). The dual tandem pulse GMAW process provides the greatest productivity to date with four welding arcs operating simultaneously on each welding carriage. Based on the progression of laser welding technology, it is highly likely that the next generation of automated pipeline welding equipment will be built around hybrid laser arc welding (HLAW). The primary objective of this project is to develop, test, and validate a “field ready” HLAW system for full circumferential girth welding of large diameter (NPS30 and above) high strength pipe. The system is based on both robotic and direct clamp-on platforms where potential applications include double jointing operations in pipe mills and as well for onshore and offshore pipeline construction projects. The pipe grades evaluated include both X80 and X100, with wall thicknesses of 10.4mm and 14.3mm, respectively. Lab trials include high speed root pass, high speed root pass with laser assisted GMAW for fill and cap passes, and, single pass complete joint penetration girth welding. This paper discusses the approach to the development of the HLAW system, however at the time the paper was submitted no mechanical testing or system validation trials had been completed. It is expected results will be available for the conference presentation.

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Section: Discussionmentioning

confidence: 60%

Section: All Weld Metal Tensile Testing Resultsmentioning

confidence: 99%