埋弧焊钢管焊缝余高的控制

Control of Weld Bead Remaining-height of SSAW Pipe

主要阐述了控制输送用钢管埋弧焊内、外焊缝余高的重要性。焊缝的余高大,则焊缝的应力集中系数大,容易形成应力腐蚀裂纹。外焊缝余高大,不利于防腐;内焊缝余高大,将会增加输送介质的能源损失等。重点介绍了螺旋埋弧焊管内焊缝易出现的“马鞍形”问题。“马鞍形”内焊缝在焊趾处的应力相当大,这对用于输送腐蚀性介质的钢管是最有害的。为了延长钢管的服役年限,必须对焊缝余高进行有效的控制。结合生产实际,提出了输送用钢管埋弧焊焊缝余高的控制措施。

Elaborated is the importance of controlling both inner and outer weld bread remaining-height of the SSAW linepipe. The bigger the weld bread remaining-height is, the bigger the weld stress concentration factor will be, thus the easier for the stress corrosion crack to develop. Big outer weld bread remaining-height will reduce corrosion prevention effectiveness, while big weld bread remaining-height will bring about more energy loss of the transport medium. The paper focuses on the problem of the so-called ＂saddle-shaped＂ inner weld bread of the SSAW pipe, emphasizing that at the foot of such kind of weld bread, the stress is enormously big, which is harmful to the pipe for transporting corrosive medium. To prolong the service life of the steel linepipe, it is necessary to properly control the said weld bread remaining-height. Based on relevant production practice, measures for control of the weld bread remaining-height of SSAW linepipe are proposed.