PURPOSE: To execute welding under high efficiency by fitting water cooling member under condition surrounding repairing objective position as fitting condition of the water cooling box to a mold body and executing welding repair.
CONSTITUTION: A ring-like water introducing pipe 3, which surrounds the repairing objective position A at the tip part, is brought into close contact with the upper surface of the mold body 1. The welding is executed by facing welding torch 4 to the repairing objective position A, which beforehand grinder finishing, etc., is executed. Then, water 5 is circulated in the water introducing pipe 3, and flux 6 having high cleaning action is supplied at welding part and the welding is executed while discharging He gas 7 from welding torch 4. In such a way, by welding circumference of the welding objective position while surrounding there with water cooling member, the heat at the time of welding is prevented from transfer to upper part from the water cooling part.
UCHIBAYASHI TETSUO
KAJI KOHACHI
