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Effect of Chloride on Offshore Structure Welding Procedure

Zakaria Bin Mohamed, Zakaria (2009) Effect of Chloride on Offshore Structure Welding Procedure. Universiti Teknologi Petronas, Sri Iskandar,Tronoh,Perak. (Unpublished)

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Abstract

The objective of this research was to determine the effect of chloride to the welded ASTM A516 Grade 70 materials. The used of proper welding procedure may eliminate the probability of crack occurrences, but there were still cracking happen in some offshore welding. That was because the failures may occur hours or days after the welding work completed. The scope of the study was on ASTM A516 Grade 70 steels welded using WPS FSP-HLE-17-49 procedure and exposed under salt environment according to ASTM G41-90 at 35°C for period of 1 to 5 days. Non Destructive Examination such dye penetrant and magnetic particle testing were used to investigate the initial conditions of specimen and the conditions after exposing the materials under the simulated offshore environment. Metallographic examinations of the specimen were crucial in this study. The study had shown that the welded structure using the WPS produced complete welds with no visible surface crack. The hardness of the weld and the HAZ was 213(HV10) and 224 (HV10) respectively. There were found to be well below critical hardness value i.e. 300 (HV10) for weld metal and 248 (HV10) for HAZ, as according to PTS 20.112. There were no surface cracks found throughout the duration of the study. The study concludes that if the welding was done in strict compliance with the code and standard, high weld integrity would be produced.

Item Type: Final Year Project
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 5 not found.
Date Deposited: 11 Jan 2012 12:24
Last Modified: 25 Jan 2017 09:44
URI: http://utpedia.utp.edu.my/id/eprint/688

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