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RELIABILITY OF DISSIMILAR METAL WELDS SUBJECTED TO SULFIDE STRESS CRACKING

Fallatah, Gasem M. and Sheikh, Anwar K. and Khan, Zafarullah and Boah, John K. RELIABILITY OF DISSIMILAR METAL WELDS SUBJECTED TO SULFIDE STRESS CRACKING. The 6th Saudi Engineering Conference, KFUPM, Dhahran, December 2002.

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Abstract

Serious concerns have been raised in recent years in the Oil & Gas Industry about the reliability of Dissimilar Metal Welds (DMWs) in sour service. The primary reason for these concerns is because DMW joints exhibit small-localized hard zones that are susceptible to Sulfide Stress Cracking (SSC). In the open literature some methods such as preheating have been suggested to overcome the problem of hard zone formation. The objective of this study is to assess the effect of Sulfide Stress Cracking (SSC) on the reliability (mechanical integrity) of DMWs specimens fabricated with different preheat temperatures and electrodes exposed to sour service environment. The National Association of Corrosion Engineers (NACE) Standard Tensile Test TM 01-77-96 Method A was used to determine the influence of SSC on DMWs in a systematic manner. Test results show considerable improvement in the Time-To- Failure as a result of the preheating methods used. However, it does not appear that the hard zones can be reliably eliminated for manual welding methods, even with the nickel-base electrode, and the optimum preheat temperature. Metallographic Examination and Scanning Electron Microscope Characterization were also used to assess the susceptibility and the failure modes.



Item Type:Article
Subjects:Mechanical
Divisions:College Of Engineering Sciences > Mechanical Engineering Dept
Creators:Fallatah, Gasem M. and Sheikh, Anwar K. and Khan, Zafarullah and Boah, John K.
ID Code:1702
Deposited By:INVALID USER
Deposited On:04 Jun 2008 09:54
Last Modified:12 Apr 2011 13:11

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