Welded structure having improved mechanical strength and process for making same
US4348131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1980 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | May 6, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T403/21
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A welded structure and a method for making same wherein a plurality of weld metals, such as martensitic steel and austenitic steel, differing in coefficient of thermal expansion from each other are deposited in a plurality of layers thicknesswise of the welded structure in a gap defined by structural members to be welded in such a manner that a layer of the weld metal of higher coefficient of thermal expansion is covered by a layer of the weld metal of lower coefficient of thermal expansion in a weld formed, to improve brittle fracture strength, fatigue strength and stress corrosion cracking resistance of the weld. By subjecting the welded structure to stress relief annealing treatment, it is possible to produce compressive stress on the surface of the layer of the weld metal of lower coefficient of thermal expansion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.