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Stress Corrosion Cracking on Welding of Offshore Structure

Azizdin, Amirul Iman Bin (2009) Stress Corrosion Cracking on Welding of Offshore Structure. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

The objective of this research is to study on Stress Corrosion Cracking on welding of offshore structure. Offshore structure such as topside will have deflections at the joint due to a combination of load on the decks. The deflections result tensile stress on the structure. The tensile stress and residual stress from welding process of the structure leads to occurrence of Stress Corrosion Cracking. The scopes of study covers (a) conduct Stress Corrosion Cracking Tests using Bolt Loaded Double Beam Test, (b) conduct corrosion experiment with the affect of offshore environment which seawater with pH between 7.5 to 8.0 and temperature of 35°C and (c) examine Stress Corrosion Cracking for material A516 grade 70 with Shielded Metal Arc Welding (SMAW). The offshore welding samples were gathered from the fabricator and the samples were used for testing and experimental works for this project. The sample inspected by using Liquid Penetrant Inspection to detect any discontinuities of the weld before any test conducted. The samples then were setup for Bolt Loaded Double Beam Testing to study the behavior of SCC. With these setup, the samples were examined under offshore condition in Salt Fog Corrosion Chamber for two weeks (336 hours). The losses in mass of the samples recorded to calculate the Corrosion Rate. The characteristics of the sample’s microstructure were studied by using Optical Microscopy. It was found that Stress Corrosion Cracking initiated and propagated in the sample when the deflections of the sample were higher than the design maximum allowable deflection of the joint of 37.17mm/5000mm length. There are two types of SCC present in the samples, which are Intergranular and Transgranular SCC. The presence of SCC increases the Corrosion Rate

Item Type: Final Year Project
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 1278 not found.
Date Deposited: 02 Oct 2012 15:24
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/3806

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