PURPOSE: To produce easily and quickly a large-sized steel material by partitioning the space formed of a pair of billets faced to each other by gates and subjecting the partitioned space to electroslag welding while cooling the end face of the gate on the non-welding side.
CONSTITUTION: A copper plate 19 formed intenally with cooling water passages 18 is disposed to one end face (the space 152 side which is not welded first) of one gate 12 and a heat insulating material 10 is provided between the gate 12 and the plate 19. Plural pieces of hydraulic cylinders 20 are further interposed vertically between the plate 19 and the gate 12 behind said plate. Cooling hoses 17 are thereafter connected to the passages 18 and the supply of water is started; at the same time, plural pieces of consumable nozzle type electrodes provided with welding wires are inserted into the space 151 partitioned by the other end face side of the gate 12 to perform electroslag welding. A molten metal is then gradually accumulated in the space 151 and the gate 12 is heated and melted by the convection of the molten slag which is heated by the current.
HIROMOTO NOBUMI
MINAMI NAGIO
NAKANO TSUNEO
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