Method for improving the performance of seam-welded joints using post-weld heat treatment
US7618503B2 · kind B2 · utility
7Cited by
40References
11Claims
0Family size
Inventors
Key dates
| Filing date | Jan 17, 2008 |
| Grant date | Nov 17, 2009 |
| Priority date | — |
| Expiry date | Jan 17, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a method for heat-treating seam-welded constructions of hardenable steel and ferrous alloys with reduced weld-zone hardness and improved weld-zone ductility and toughness. This method consists of heating the seam weld rapidly with a secondary heat source to a temperature greater than the martensitic start temperature but not greater than the lower critical temperature, followed by immediately allowing the seam weld to air-cool. The rapid tempering of this invention is particularly suited to the production of high strength hardenable alloy seam-welded pipe and tubing and other structures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.