Casting mold for fusion welding of two workpieces
US5850962A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 1997 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | May 20, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K23/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In order to reduce the residual stresses which occur in the region of a fusion weld of two rail ends (1,2), in order to reduce, in particular to make uniform, the cooling-down rate and--associated with this--the crystallization process within the solidifying weld material, a casting mold is proposed which is equipped with a system of risers (9) and air vents (10) which are designed symmetrically with respect to a longitudinal center plane (5) and a transverse center plane (3) of the welded joint, the risers (9) and the air vents (10) being physically distributed as a function of geometric parameters of the rail foot (8) and of the weld bead (4), and the cross sections of the air vents (10) being dimensioned as a function of the cross sections of the risers (9). The positioning of the air vents (10) and of the risers (9) according to the invention in conjunction with the cross-sectional dimensioning of the former allows cooling conditions to be set up in which the weld material is effectively prevented from solidification starting on the outside with respect to the rail profile, and in which a considerable reduction in the residual stresses can be achieved, with the cooling process …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.