| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-consumable nozzle type electroslag welding method capable of consistently enhancing the toughness of a weld metal while maintaining the soundness of a joint by controlling a welding condition without changing component compositions of a welding wire, a steel material, and a backing. SOLUTION: For the diaphragm thickness TD mm, the groove width a is 19-25 mm, the welding heat input Q is (17.5×TD-250) to (17.5×TD-115) kJ/cm, the depth h of a slag bath is 15-35 mm, the minimum distance between a surface of a power supply nozzle and a surface of a skin plate is 1-5 mm, the swinging width sw of the power supply nozzle is (TD-12) to (TD-2) mm, the swinging number of the power supply nozzle 6 is 2-10 rounds/minute, the stop time is 2-10 seconds. The power supply nozzle 6 is swung in the thickness direction of the diaphragm, and a weld metal is formed so that the penetration width on the skin plate side is≥3 mm at the section orthogonal to the welding direction, and the elliptical shape has the sectional area SA of (-100+50×TD) mm<SP>2</SP>, and the ratio of the major axis W/minor axis D is≥1.1. COPYRIGHT: (C)2008,JPO&INPIT |
