AN INVESTIGATION OF UNDERWATER WELDED HY-80 STEEL

The objective of this thesis was two fold; first was the desire to extend previous laboratory work and to evaluate the ability to fabricate acceptable underwater welded HY-80 steel joints, under working conditions, within the guidelines of the United States Navy governing underwater welding operations, and secondly was the desire to investigate the occurance of the hydrogen embrittlement phenomena in the underwater welded HY-80 steel joints. A series of working dives, under working conditions, within the guidelines of the United States Navy governing underwater welding operations, were conducted by the author. These dives simulated the welded repair of a crack in an underwater body, in accordance with the Underwater Cutting and Welding Manual, Navships 0929-000-8010. The results of the microscopic investigation, microhardness tests, and mechanical bend tests have indicated a capability to fabricate acceptable underwater walded HY-80 steel joints, under working conditions, within the guidelines of the United States Navy governing underwater welding operations, which do not suffer from the hydrogen embrittlement phenomena. This capability is found to exist for water environment temperatures of 25 C (77 F) and below, providing the water is clear and the welder-diver is able to use the multi-pass welding technique. This thesis is presented in five parts in an effort to facilitate the needs of the readers. In addition to the parts explaining the experimental results, the findings of the author, and the references used by the author, are parts which provide extensive introductory background information and appendixes of detailed particulars.

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Renneker, S L
• Publication Date: 1974-6

Subject/Index Terms

• TRT Terms: Embrittlement; HY 80 steel; Welding
• Uncontrolled Terms: Hydrogen embrittlement
• Old TRIS Terms: Underwater welding
• Subject Areas: Construction; Marine Transportation;

Filing Info

• Accession Number: 00071697
• Record Type: Publication
• Source Agency: Massachusetts Institute of Technology
• Report/Paper Numbers: MS Degree
• Files: TRIS
• Created Date: Nov 12 1974 12:00AM