从钢管设计角度提升管道自动焊接质量

Improving the Quality of Automatic Pipe Welding from the Pipe Design

摘要: 本文以目前大口径高钢级管道工程使用的自动焊接质量提升为前提，从钢管化学成分、拉伸强度、管端几何尺寸及加工以及焊接工艺评定适用性四个方面提升钢管的设计水平。主要表现为合理缩窄钢管、感应加热弯管中碳元素及合金元素含量的波动范围；限定并统一钢管的屈服强度波动区间，同时增加对钢管纵向屈服强度的限定；提高管端几何尺寸精度，同时对不等壁厚对接采取内孔锥型坡口的加工；提高焊接工艺评定用钢管和实际现场焊接施工用钢管的匹配度等方面。通过从以上几方面对钢管设计技术指标的提升，进一步提高高钢级管道自动焊接的质量和稳定性。

Abstract: In the view of automatic welding quality improvement used in large-diameter and high-grade steel pipeline engineering, the purpose of writing the paper is to improve the design level of steel pipes from four aspects of steel pipe chemical composition, tensile strength, pipe end geometry and processing, and welding process applicability. It is mainly manifested as a reasonable narrowing of the fluctuation range of carbon and alloy elements in steel pipes and induction heating bends. The yield strength fluctuation range of steel pipes is limited and unified, and the limitation on the longitudinal yield strength of steel pipes is increased. The accuracy of the pipe end geometry is improved, and inner hole taper groove processing for the unequal wall thickness is adopted at the same time. Matching degree of the steel pipe used for welding procedure specification and the steel pipe used for welding construction is improved, etc. By improving the design and technical factors of steel pipes from the above aspects, the quality and stability of automatic welding of high-grade steel pipes will be further improved.