Casting mold for fusion welding of two workpieces

Details Casting mold for fusion welding of two workpieces Casting mold for fusion welding of two workpieces

1997-05-20

1998-12-22

Heinrich, Samuel M.

Metal fusion bonding

Including means to apply flux or filler to work or applicator

104 15, 266167, 228 443, 2282343, B23K 2300

Patent

active

058509623

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 being slowed down overall.

REFERENCES:
patent: 3620291 (1971-11-01), Delachapelle
patent: 4190228 (1980-02-01), Bommart
patent: 4250944 (1981-02-01), Moring
patent: 5151202 (1992-09-01), Bommart
patent: 5215139 (1993-06-01), Swartz et al.

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