Method and arrangement for crack removal

An arrangement for removing a crack in a metallic material during a hot metal making process comprising:

• a crack detecting unit including a transmitter coil and at least one receiver coil,
• a crack removal unit arranged at a known distance from the crack detecting unit,
• the crack removal unit including at least one ejector configured to eject a carving means and to vary an intensity of the ejected carving means,
• a control unit configured to feed a current to the transmitter coil according to a known schema for generating a magnetic field in the metallic material, detect the magnetic field via the receiver coil to generate a signal, and process the generated signal to determine the presence of a crack and a crack depth of the crack, wherein upon detection of the crack during the metal making process, the control unit is configured to send a crack detection signal and the crack depth to the crack removal unit for activating the ejector to remove the crack and setting the intensity of the ejected carving means based at least the crack depth,
• wherein the control unit is configured to determine a first distance between the ejector and a surface of the metallic material, and wherein the control unit is configured to set the intensity of the ejected carving means based at least on the crack depth and said first distance, and
• wherein the crack detecting unit and the crack removal unit are attached to a common platform such that the crack detecting unit and the crack removal unit are arranged along the same operational line of the metallic material.

An arrangement for removing a crack in a metallic material during a hot metal making process comprising:

• a crack detecting unit including a transmitter coil and at least one receiver coil,
• a crack removal unit arranged at a known distance from the crack detecting unit, the crack removal unit including at least one ejector configured to eject a carving means and to vary an intensity of the ejected carving means,
• a control unit configured to feed a current to the transmitter coil according to a known schema for generating a magnetic field in the metallic material, detect the magnetic field via the receiver coil to generate a first signal, and process the generated first signal to determine the presence of a first crack and a first crack depth of the first crack, wherein upon detection of the first crack during the metal making process, the control unit is configured to send a first crack detection signal and the first crack depth to the crack removal unit for activating the ejector to remove the first crack and setting the intensity of the ejected carving means based at least the first crack depth,
• wherein the control unit is configured to determine a first distance between the ejector and a surface of the metallic material, and wherein the control unit uses the first crack depth and said first distance as input to adjust the intensity of the ejected carving means provided by the ejector for removing the first crack,
• the control unit configured to detect the magnetic field via the receiver coil to generate a second signal and process the generated second signal to determine the presence of a second crack and a second crack depth of the second crack, the second crack depth being different than the first crack depth, wherein upon detection of the second crack during the metal making process, the control unit is configured to send a second crack detection signal and the second crack depth to the crack removal unit for activating the ejector to remove the second crack and setting the intensity of the ejected carving means based at least the second crack depth,
• wherein the control unit uses the second crack depth and said first distance as input to adjust the intensity of the ejected carving means provided by the ejector for removing the second crack, wherein the intensity for removing the second crack is different from the intensity for removing the first crack.