Journal of Failure Analysis and Prevention

, Volume 14, Issue 6, pp 763–771 | Cite as

Welding Hot Cracking of Side Shell of Drilling-Well Oil Storage Ship

Technical Article---Peer-Reviewed
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Abstract

Cracks were found in the weld metal (WM) of weld-section of side shell of drilling-well oil storage ship when performing post weld radiographic examination. The cracks were subjected to detailed metallographic analysis and the fracture surfaces were observed visually and using SEM. The results indicate that the cracks were embedded in middle of multiple beads of WM. The fracture surface reveals the dendritic solidification structure of WM, which contains impurity element sulfur and other alloy elements (Ti, Al, and O) originating from the filler core of welding wire. The embedded cracks are a type of weld hot crack, the solidification crack. The failure mechanism is identified to be welding hot cracking.

Keywords

Drilling-well oil storage ship Embedded crack Welding hot crack Solidification crack 

Notes

Acknowledgments

The project was supported by “the Fundamental Research Funds for the Central Universities (No. 3132014323).”

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Copyright information

© ASM International 2014

Authors and Affiliations

  1. 1.Key Laboratory of Ship-Machinery Maintenance & Manufacture, Ministry of Communication, PRC; Department of Materials Science and EngineeringDalian Maritime UniversityDalianPeople’s Republic of China

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