This website uses non-intrusive cookies to improve your user experience. You can visit our cookie privacy page for more information.

RR90 - Re-evaluation of fatigue curves for flush-ground girth welds

The fatigue performance of girth welded steel pipes with the weld cap and root flush ground is designated as class C in the British standard BS 7608 code for fatigue design. However, this is not based on experimental data. Since fatigue results for flush-ground girth welds in steel pipes have now become available, it is necessary to re-evaluate the design of the S-N curve(s), for such welds on the basis of the relevant experimental data. For flush-ground joints, internal defects become the weak link in the fatigue performance. The effect of embedded flaws on fatigue design must also be therefore re-assessed since the current embedded flaw acceptance criteria were also based on joints in flat plate rather than girth welds. A comprehensive examination of published works regarding fatigue performance of flush ground welds with and without reportable flaws was carried out. Discussion and communications were also held with research workers in this area. Reports a number of conclusions, including the setting up of a database of fatigue test results for flush ground girth welds that has been statistically analysed.

The Research Report Series are produced in Adobe Acrobat. The use of the latest version of the software is recommended which is available at the Adobe website via the link on this page.

Assistance in the use of Adobe Acrobat PDF files is available on our FAQs page.

Updated 2010-03-19