Changing Perspectives (January 1998)

Craig, DeAnn

doi:10.2118/0198-0012-jpt

Cited by 1 publication

(1 citation statement)

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“…Pipelines of low carbon steel welded by electric arc have been used for many years and are widely used in the petroleum industry. However, frequent failures during operation over the years 4 have prompted several studies of the design, construction, operation and maintenance of equipment and metallic structures used in this industry. Oil and gas from Mexico contain entrained water, CO 2 and H 2 S. 5 These constituents, when moving through the pipelines, induce failures, mainly in the weld bead.…”

Section: Introductionmentioning

confidence: 99%

Sulphide stress cracking behaviour of weldments produced by indirect electric arc welding

Natividad¹,

Salazar²,

Garcı́a³

et al. 2006

Corrosion Engineering, Science and Technology

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The aim of the present study was to evaluate the corrosion resistance of weldments produced by the Indirect Electric Arc technique. The material studied was API grade X-65 steel, which was corroded in NACE solution saturated with H 2 S. Three different temperatures were employed, room temperature (25uC), 37uC and 50uC. The test methods used included potentiodynamic polarisation curves, hydrogen permeation measurements and slow strain rate tests. The anodic corrosion current density and sulphide stress cracking susceptibility of the weldments were found to be unaffected by temperature over the range 25-50uC. However, values of the steady-state hydrogen permeation current, hydrogen permeation rate, effective diffusion coefficient, and the concentration of hydrogen atoms at the entrance side all increased with temperature. The cracking of the X-65 weldments is explained in terms of a hydrogen embrittlement mechanism.

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Section: Introductionmentioning

confidence: 99%