GB1381276A - Repair of bottom plates of ingot moulds - Google Patents

Abstract

1381276 Welding by fusion; ingot moulds; jointing HILTI AG 10 July 1972 [21 Aug 1971] 39312/71 Headings B3R B3F and B3V A method of repairing a crack 14 in the haematite iron bottom plate 11 of an ingot mould, comprises forming a recess 36 in the top surface of said bottom plate so as to extend across the crack, forming at least one anchorage hole 37, as by burning with a thermic lance, in said bottom plate at each side of the crack so as to open into said recess, each said hole, e.g. bulb or pear shaped, having a cross-section, at a distance from, but parallel to, the plane of, its opening into the recess, at least one dimension of which is greater than the corresponding dimension at said opening, positioning in said recess a repair plate 38 having apertures 39 corresponding with the anchorage holes, and filling said holes and apertures with weld metal which fuses with the repair plate and anchors with the bottom plate. As shown, two repair plates are used for respective cracks 13, 14. The repair may be further improved by welding around the periphery of the repair plate(s), by using a repair plate having an H-shape (Fig. 9, not shown), or widened ends (Fig. 10, not shown), so as to provide repair plate/bottom plate interlock, by repeating the repair at the bottom surface of the bottom plate, or by securing auxiliary strengthening plates 44 to the side faces of the bottom plate by nail-like fasteners 45 driven in by a cartridge-actuated tool. A method using the repair plate 38 and weld metal filled holes and apertures, wherein the plate is applied to the bottom plate side faces (Figs. 3, 4, not shown), is disclosed but not claimed. Reference has been directed by the Comptroller to Specification 1,150,014.