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西洱河三级水电站压力管道岔管是内加强月牙肋结构,采用16MnR钢材,管壁厚度30mm。肋板为组合式,由中肋板(厚30mm)和两块侧板(14mm)组成,岔管公切球直径4400mm。岔管在工地组装,按常规参数焊接。中肋板与岔锥管管壁的连接焊缝,焊后5～10h,在内壁中肋板左、右两侧焊趾处产生裂纹(冷裂纹),见图1所示。从焊趾处起裂,穿过中肋板焊缝热影响区,深入肋板后逐渐与中肋板表面平行,呈层状撕裂。裂纹长度:左侧长1500mm、
The pressure pipe bifurcation pipe of Xi’erhe III Hydropower Station is an internally reinforced crescent rib structure with 16MnR steel and the wall thickness of the pipe is 30mm. Ribs for the combined type, by the ribs (thickness 30mm) and two side panels (14mm) composition, fork pipe public cut ball diameter 4400mm. Bifurcated pipe assembly in the site, according to the conventional parameters of welding. The connecting rib of the middle rib plate and the pipe wall of the cone pipe is 5 ~ 10h after welding, and a crack (cold crack) is generated in the toe of left and right sides of the rib in the inner wall, as shown in FIG. From the weld toe crack, through the heat-affected zone of the mid-floor weld, in-depth after the plate gradually with the rib surface parallel to the laminar tear. Crack length: left long 1500mm,