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Experimental Study of the Effectiveness of Weld Buttering for the Repair of Corroded Pressure Hulls

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Technical Report

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C-FER Technologies Inc Edmonton, AB

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C-FER Technologies, Inc., was awarded Contract Number W7707-098210001HAL with Public Works and Government Services Canada PWGSC to design, fabricate and test large scale ring stiffened cylinders. The object of this project was to assess the impact on the collapse pressure of submarine pressure hulls of metal loss due to corrosion, with and without subsequent weld buttering repair. C-FER and Martec Limited contributed to the preparation of this report and the work. Martec was responsible for the final cylinder design and finite element FE analysis, while C-FER was responsible for providing technical support on the end cap design, collapse testing facilities, testing expertise and overall project coordination. The three specimens, designated as Specimen A- Baseline, Specimen B- Damaged, and Specimen C- Repaired, were fabricated and tested, and the resulting collapse pressures were 7.75, 7.31 and 7.66 MPa, respectively. The simulated corrosion damage i.e. metal loss reduced the collapse capacity by 5.9, whereas repair of simulated corrosion damage by metal replacement through weld buttering recovered 4.8 of that capacity. The findings indicate that weld buttering can be an effective corrosion repair technique.

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