Arrangement For Crack Detection In Metallic Materials In A Metal Making Process

An arrangement for a metal making process for detecting cracks along a strip of a metallic material moving in relation to the arrangement, the arrangement comprising:

• a coil arrangement having:
• a first winding portion extending in a first direction for inducing a first current in the first direction in a portion of the strip,
• a second winding portion extending in a second direction for inducing a second current in the second direction in the portion of the strip, the first direction and the second direction intersecting each other,
• a first receiver coil arranged to detect a magnetic field generated by the first current, and a second receiver coil arranged to detect a magnetic field generated by the second current, the magnetic field generated by the first current and the magnetic field generated by the second current providing a measure of whether a crack is present in the portion of the strip and a direction of the crack,
• wherein the first winding portion is arranged at a first distance from the first receiver coil;
• and
• a protection member arranged to be sandwiched between the coil arrangement and a metallic material when the arrangement is in use, to maintain a second distance between the first winding portion and a surface of the metallic material, wherein the first distance and the second distance differ less than 40%.