基于均匀磁化的SAWH焊管无级直流在线两点消磁法

Homogeneous Magnetization-based Infinite DC On-line 2-point Demagnetization Process for SAWH Pipes

简要介绍了SAWH焊管的消磁理论和国内常用的消磁方法,重点介绍了基于均匀磁化的SAWH焊管无级直流在线两点消磁法,即在SAWH焊管制造主机后桥设置第一消磁点,在X射线探伤室设置第二消磁点。采用该消磁法时,借助于X射线工业电视图像来精确判别、调整消磁磁场的大小,从而有效地对SAWH焊管进行消磁,防止剩磁的反弹,实现了以简单的设备和精细化的控制来获得较理想的消磁效果。

Briefed are the demagnetization theory and the demagnetization processes as commonly used for SAWH pipes. Focused on is the homogeneous magnetization-based infinite DC on-line 2-point demagnetization process for SAWH pipes, which involves setting up the No.1 demagnetization point at the outlet table of the SAWH pipe mill proper, and the No.2 demagnetization point in the X-ray detection room. In case of using this demagnetization process, the demagnetization field size is accurately identified and adjusted via the picture of the X-ray industrial TV, and thus adequate demagnetization of the SAWH pipe is obtained, and rebounding of remanent magnetization is prevented. And in this way, satisfactory demagnetization is realized by means of simplified equipment and fine control process.