螺旋埋弧焊管剩磁机理及剩磁综合控制措施

摘要

Aiming at the residual magnet phenomenon after SAWH pipe manufacture, it analyzed the causes of residual magnet and the effect of residual Magnet on X-ray industrial TV inspection and on-site butt welding construction. Some measures to reduce and eliminate residual magnet were put forward from welded pipe production process and on-site welding construction , including wraping welding cable on pipe end, placing magnet on pipe end, reverse distribution residual magnet (homopolarity method)etc. Finally, it analyzed and compared the advantages and disadvantages of the above several demagnetization methods for SAWH pipe on-site butt welding, and provided the optimized proposal of residual magnet comprehensive control and demagnetization.%针对螺旋埋弧焊管制管后存在剩磁的现象，分析了剩磁产生的原因及其对焊管在线X射线工业电视检测和现场对接焊施工的影响。分别从焊管生产过程及焊接施工现场两方面提出了减小、消除焊管剩磁的措施，如管端缠绕焊接电缆线法、管端放置磁铁抵消法、焊管剩磁反向布置法（同极法）等。分析对比了螺旋埋弧焊管现场对接时几种消磁作业方法的优缺点，最后给出了剩磁综合控制及消磁的优化方案。