| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of welding and repairing a gear box of a rolling stock, which eliminates a fear of cracking at the time of welding, achieves uniform hardness at a welding portion, and is free from degradation of strength of a base metal. SOLUTION: There is provided the method of welding and repairing the gear box of the rolling stock, which is formed of spheroidal graphite cast iron. According to the method, a defective cast portion of the gear box is subjected to gas welding by using a welding rod formed of a common material, and heated to a temperature of 890°C or more, followed by holding the same state over a predetermined period. Then the gear box is furnace-cooled down to 750 to 820°C, and held at the same temperature over one hour or more, followed by air-cooling the same. According to the method, the gear box for the rolling stock can be formed of the spheroidal graphite cast iron of which a large vibration damping effect can be expected compared with a gear box formed of cast steel. COPYRIGHT: (C)2006,JPO&NCIPI |
