Patent ID: 11965856
Assignee: NIPPON STEEL CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 13:
14. The method for detecting a metal residue present in an electric-resistance-welded steel pipe according to claim 1,
wherein the metal residue present in the electric-resistance-welded steel pipe is detected by a yoke member having a first opening part which is located on one end side along the longitudinal direction of the electric-resistance-welded steel pipe and into which the electric-resistance-welded steel pipe is inserted and a second opening part which is located on the other end side along the longitudinal direction of the electric-resistance-welded steel pipe and into which the electric-resistance-welded steel pipe is inserted, having an outer shape substantially axisymmetric with respect to an axis passing through the first opening part and the second opening part, and surrounding the exciting coil and the detecting coil.