Patent ID: 9136026
Filing Date: 2015-09-15
Classification: B23K,G21C,Y02E

Abstract:
1. A reactor bottom repairing method of sealing a crack occurring on a surface of a cylindrical body penetrating through a lower end portion of a reactor bottom portion and fixed to the reactor bottom portion by using a welding torch, the reactor bottom portion including an inclined surface inclined relative to the cylindrical body, the method comprising: providing an apparatus for driving a welding torch, the apparatus including six control shafts including a pivot shaft for entirely pivoting the apparatus, an advance shaft for driving the welding torch in a radial direction, a vertical shaft for driving the welding torch in a vertical direction, an inclined drive shaft for driving the welding torch along an inclined angle between an inclined surface of a bottom head and the cylindrical body, a torch rotating shaft for continuously changing a torch direction from the cylindrical body side surface up to a bottom head, and a head rotating shaft for correcting a torch position shifted due to rotation of the inclined drive shaft; emitting a first heating laser beam to a cracked portion to remove moisture from the cracked portion; driving the welding torch by the apparatus including the six control shafts along the inclined surface of the lower end portion of the reactor bottom portion and the cylindrical body, and while driving the welding torch changing a direction of the welding torch from a side surface of the cylindrical body to the lower end portion of the reactor bottom surface; emitting from the welding torch a first welding laser beam following a portion to be welded to the lower end portion of the reactor bottom portion to form a welded portion, a position of the welding laser beam changing to follow the portion to be welded by a welding machine correcting a position of the welding torch shifted by rotation of a drive shaft of the welding torch; and emitting a second heating laser beam and a second welding laser beam to an entire surface of the cylindrical body inside the reactor and the welded portion between the cylindrical body and the lower end portion of the reactor bottom portion thereby preventing a new crack from occurring.