Underwater Wet Repair Welding and Strength Testing on Pipe-Patch Joints

[+] Author and Article Information
R. Wernicke, R. Pohl

Institute of Naval Architecture, Technical University Hamburg-Harburg, AB 3-06/2, Lammersieth 90, 22305 Hamburg, Germany

J. Offshore Mech. Arct. Eng 120(4), 237-242 (Nov 01, 1998) (6 pages) doi:10.1115/1.2829546 History: Received April 28, 1998; Revised June 11, 1998; Online December 17, 2007


The underwater wet welding method for repairing of submerged structural members has been intensively developed during the last years. It is an economical and especially more time-independent procedure. The shortened repair duration is a major advantage in regions with rough sea climate as the North Sea area. During research projects the weldability and fatigue performance of pipe-patch connections have been tested. These joints are in use for repairing of collision indents. The shape of the actual used repair patch was optimized to the requirements of underwater wet welding at high tensile strength steels as BS4360 Gr 50D. Steel materials in this grade show problems in regard to high hydrogen susceptibility, and therefore cold cracking. The fatigue behavior of the patch-welded pipe structural member has been investigated. First test series were carried out using as-welded joints. In a second part of the project, post-weld-treated connections were tested. The weld seams on these joints were partially ground or hammer peened. The test results have been evaluated by means of the hot-spot concept and then faced with actual code requirements. Extensive strain gage measurements and finite-element calculations have been carried out to provide the stress state in the structural details.

Copyright © 1998 by The American Society of Mechanical Engineers
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