Patent · US Expired

Method for improving service life of rail welds by aluminothermic heat treatment

US5306361A · kind A · utility

5Cited by

9References

4Claims

0Family size

Inventors

Gordon O. Besch · New Brighton, US
Robert H. Kachik · Bangor, US
Mark A. Swartz · Brick, US
Frank Kuster · Breitscheid, DE
Hans Guntermann · Essen, DE

Key dates

Filing date	Oct 2, 1992
Grant date	Apr 26, 1994
Priority date	—
Expiry date	Oct 2, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D9/04
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

In the heat treatment in the field of a thermite weld between rail ends, the rail ends and the weld are enclosed within a containment filled with an aluminothermic material mixture. The mixture is ignited and the rail ends and the thermite weld are heat-treated for a given period. After the given period, the aluminothermic reaction products and the containment are removed, and an air quench unit is placed about the weld and rail ends and compressed air is directed at the weld and rail ends for a given time period. After the removal of the air quench unit, the weld is allowed to cool to ambient temperature.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.