Abstract: A roll welding machine has the frame mounting head and tail stocks for axially supporting a castor roll having a crack therein. The heat source is mounted upon the frame below and along the length of the roll for maintaining said roll at a minimum temperature of 600.degree. F., approximately. An upright support of inverted U-shape is secured to the frame and includes upright standards. Vertically adjustable interconnected slide carriers are mounted upon the standards and connected to a power winch by cables and pulleys. A power reciprocated cross slide is mounted upon the slide carriers and mounts horizontal support beam on which is guidably mounted a travel carriage supporting a depending welding head assembly. A welding wire drive feed head feeds the welding wire from a drum journaled upon the carriage. The side and ends of the roll are enclosed to define a uniform heat zone chamber whereby while the roll is welded, it is maintained at the minimum preheat temperature.

Abstract: A retractable gantry heat treat furnace includes an elongated refractory bed mounted upon a floor for supporting metal parts for heat treatment. A pair of spaced tracks are mounted upon the floor upon opposite sides of the bed and extend longitudinally outward from one end thereof. An upright bulkhead is mounted upon said floor at the other end of said bed transversely thereof. An upright furnace housing having a closed end and an open end is movably mounted upon the tracks and has a retracted load position outwardly of said bed and adapted to move to a closed position over and enclosing said bed and sealed against said bulkhead. A series of spaced inwardly directed burners are mounted upon and along the side walls of the housing in communication with the interior thereof and are adapted for energization when the housing is in a closed position.