EVALUATION OF IMPROVED MATERIALS AND METHODS OF FABRICATION FOR WELDED STEEL SHIPS
This report covers work done during the period June 25, 1947 to February 1, 1948. A survey was made of published and unpublished reports to appraise the various kinds of tests used to study strength, ductility, and transition temperatures of welded joints in structural steels. On the basis of this survey, the Project Advisory Committee selected the tee-bend test, the longitudinally welded and transversely notched bead-bend tests (Kinzel and Lehigh types), and the transversely welded and transversely notched bead-bend tests (Naval Research Laboratory high constraint and Jackson types). These tests were used in a study of steels "B sub r" and "C" and to correlate results obtained with them with results from the hatch corner tests made at the University of California. It was thought that if one of these tests were to give the same transition temperature for B sub r and C steels that the hatch corner did with these steels, then that test would be worthy of further study as a possible acceptance test of steel for ship plate. The studies were made with project steels B sub r and C because they previously exhibited a widely different behavior in the full-scale hatch corner and other tests. Class E6010, 5/32- and 3/16-inch diameter electrodes were used to make the samples for the initial tests. The specimens were tested at various temperature levels to determine the transition temperatures by means of the following criteria: absorbed energy, bend angle, lateral contraction, and fracture appearance. The transition temperatures for the B sub r and C steels showed that all the tests for both welded and unwelded specimens rated the two steels in the same qualitative order as indicated by the hatch corner tests. The variations in the actual transition temperatures were influenced by specimen design, welding conditions, and the various methods of evaluating transition temperature. It was also believed that the oriented discontinuities in the B sub r steel, caused by large elongated complex sulphide inclusions, influenced fracture propagation, and hence the energy absorption, the total bend angle, and the fracture appearance of specimens made from this steel.
Battelle Memorial Institute505 King Avenue
Columbus, OH United States 43201
Ship Structure CommitteeNational Academy of Science, 2101 Constitution Avenue, NW
Washington, DC United States 20418
- BENNETT, R W
- Rieppel, P J
- Voldrich, C B
- Publication Date: 1949-3-30
- Features: References;
- Pagination: 51 p.
- TRT Terms: Cracking; Ductility; Joints (Engineering); Strength of materials; Transition point; Weld strength; Welds
- Identifier Terms: Ship Structure Committee
- Uncontrolled Terms: Crack propagation; Welded joints
- Old TRIS Terms: Weld ductility
- Subject Areas: Marine Transportation; Materials;
- Accession Number: 00330979
- Record Type: Publication
- Source Agency: Ship Structure Committee
- Report/Paper Numbers: SSC- 23 Prog Rpt.
- Contract Numbers: NObs-45543, NObs-34231
- Files: TRIS
- Created Date: May 21 1981 12:00AM