EVALUATION OF IMPROVED MATERIALS AND METHODS OF FABRICATION FOR WELDED STEEL SHIPS
Work done toward finding a test for evaluating steels for large welded structures started with a literature survey of tests used previously to study the qualities of welds in steel and the weldability of steels. From the results of the survey, five types of tests which seemed most promising for further study were selected. Of the five types of tests selected and studied, the Kinzel test using notched weld-bead specimen was used for the major part of the work, particularly to determine the transition-temperature ranges of project steels "Br", "C", "A", and "W" and to determine the micromechanism of fracture initiation and propagation as a guide to the interpretation of the results. At the start, a premise was set up for this investigation that, if the transition-temperature range which had previously been determined for the full-scale hatch-corner specimen was matched by that of a small specimen of the same steels, the small specimen would be useful in predicting the performance of steels in large welded structures in general. To this end, various modifications were made in the design of the Kinzel-type specimen and in testing procedure. A detailed study was made of crack initiation and propagation in Kinzel-type specimens to obtain fundamental information on factors contributing to the performance of the test. It was also desired to determine why welded Kinzel-type specimens always gave poorer performance than unwelded Kinzel-type specimens of the same steels. On the third objective, work included a study of forty-one heats of ABS Classes B and C steels using the Battelle underbead cracking test. Nine of these steels were used in large tee joints designed to simulate ship-welding conditons. The effects of various test modifications on cracking in these tee joints were studied.
Battelle Memorial Institute505 King Avenue
Columbus, OH USA 43201
Ship Structure CommitteeNational Academy of Science, 2101 Constitution Avenue, NW
Washington, DC USA 20418
- Baysinger, F R
- Rieppel, P J
- Voldrich, C B
- Publication Date: 1951-12-20
- Pagination: 30 p.
- TRT Terms: Cracking; Defects; Fabrication; Hatch covers; Joints (Engineering); Materials selection; Steel; Weld tests; Welds
- Identifier Terms: Ship Structure Committee
- Uncontrolled Terms: Crack initiation; Crack propagation; Weld defects; Welded joints
- Old TRIS Terms: Hatch corners; Materials evaluation; Steel fabrication
- Subject Areas: Marine Transportation; Materials;
- Accession Number: 00330993
- Record Type: Publication
- Source Agency: Ship Structure Committee
- Report/Paper Numbers: SSC- 45 Final Rpt.
- Contract Numbers: NObs-48015, NObs-50148
- Files: TRIS
- Created Date: May 21 1981 12:00AM