The Effect of Heat Input and Composition on Weld Metal Microstructures in Thin Section HY-130 GMAW(Gas Metal Are Welding) Weldments
Abstract
Thin section HY-130 is being considered by the U.S. Navy for use in decks and foundations in the SSN-21 design as a weight saving measure. Optimum welding procedures for thin section HY-130 do not currently exist, but they are being developed by David Taylor Naval Ship Research and Development Center (DTNSRDC). In this study, performed in conjunction with DTNSRDC, the effect of heat input and electrode composition on the weld metal microstructures and mechanical properties of four 12.7 mm thick HY-130 steel weldments produced by the GMAW process are reported. Microstructures were fully characterized by light and electron microscopy. Mechanical property results provided by DTNSRDC were correlated with the microstructure. The lower heat input produced microstructural refinement and a more uniform hardness. The higher carbon content electrode lowered the Ms temperature and stabilized the austenite.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1988
- Accession Number
- ADA206476
Entities
People
- Dean M. Pedersen
Organizations
- Naval Postgraduate School