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一、前言龙羊峡水电站引水钢管制造由机修厂和安装队分别承担,到82年6月底止,达1836吨。钢管瓦片由机修厂40mm卷板机卷制。由于初次使用新卷板机,过去也没有卷过40mm厚的钢板,工艺措施还不完善,引用规范不尽吻合,以及制造过程中质量检查不够健全,因此,前阶段的钢管制作质量存在问题,如瓦片端部弧度不合要求,有直边现象。用火焰矫正,又出现构件变形、组织变软等缺陷。为保证钢管质量,近来采用焊接变形矫正及热处理工艺方法,效果较好。二、变形原因及矫正方法钢管直径西φ6700mm和φ7500mm,材料16M_n、15M_nV低合金钢板,厚度δ= 34～40mm,每节管由3～4块瓦片焊成。
I. Foreword Longyangxia Hydropower Station water diversion pipe manufacturing by the repair plant and installation team were borne by the end of June, 82, up to 1836 tons. Steel tile rolling machine by the repair shop 40mm. Due to the first use of the new plate bending machine, the past has not been rolled over the 40mm thick steel plate, the process is not perfect, the reference norms are not consistent, and the manufacturing process of quality inspection is not sound enough, therefore, the quality of the previous stage of steel production problems, Such as tile curvature of the arc end, there are straight edge phenomenon. Flame correction, but also deformation of the components, organizations such as soft defects. In order to ensure the quality of steel pipe, welding distortion correction and heat treatment process have been adopted recently, and the effect is better. Second, the causes of deformation and correction methods Pipe diameter West φ6700mm and φ7500mm, material 16M_n, 15M_nV low alloy steel, the thickness δ = 34 ~ 40mm, each tube by 3 to 4 tiles welded into.