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News
Simple introduction of spiral steel pipe demagnetization method
Views: 130 Update Date: Oct 12 , 2022
Simple introduction of spiral steel pipe demagnetization method
1, with a coil around the outside of the steel pipe, to the coil of alternating current, slowly reduce the current of alternating current, until reduced to zero. Demagnetization results: does not change the physical properties of spiral steel pipe, but once again encountered with an applied magnetic field, the steel pipe will be magnetized.
2, through the heat treatment process, can demagnetization, but, after demagnetization, the hardness and rigidity of the steel pipe will change, and then encounter the applied magnetic field in the future, after the disappearance of the applied magnetic field, the steel pipe will be basically no residual magnetism.
3, heat treatment process, which is probably: anaerobic heating to a certain temperature, and then, with 72 hours to slowly cool down to room temperature.
Simple introduction of spiral steel demagnetization method
The reason for the magnetic field of steel pipe
In the welding process, welding DC welding method, welding large lines and welding head parts due to high current, generating a strong magnetic field, steel pipe body under the action of the magnetic field, the magnetic moment obtained or tends to obtain the same direction of alignment with the external magnetic field. When the end of welding, the magnetic field gradually reduced until it disappears, due to the phenomenon of hysteresis, there is residual flux density in the pipe body, which is what we usually call the phenomenon of residual magnetism.
The danger of magnetic field of spiral pipe
The existence of remanent magnetism, so that the image intensifier deflects the direction of the electron beam, the X-ray industrial television system image "S" distortion, affecting the detection rate of natural defects such as porosity, slag, especially not weld through, cracks and other linear natural defects.
With the improvement of the pipeline steel grade and the replacement of the image intensifier of the X-ray television system, the impact of remanent magnetism is particularly prominent.
The presence of residual magnetism in the pipeline ring welding butt, will produce the phenomenon of arc bias, affecting the quality of welding. The existence of residual magnetism seriously affects the quality of construction.
1, with a coil around the outside of the steel pipe, to the coil of alternating current, slowly reduce the current of alternating current, until reduced to zero. Demagnetization results: does not change the physical properties of spiral steel pipe, but once again encountered with an applied magnetic field, the steel pipe will be magnetized.
2, through the heat treatment process, can demagnetization, but, after demagnetization, the hardness and rigidity of the steel pipe will change, and then encounter the applied magnetic field in the future, after the disappearance of the applied magnetic field, the steel pipe will be basically no residual magnetism.
3, heat treatment process, which is probably: anaerobic heating to a certain temperature, and then, with 72 hours to slowly cool down to room temperature.
Simple introduction of spiral steel demagnetization method
The reason for the magnetic field of steel pipe
In the welding process, welding DC welding method, welding large lines and welding head parts due to high current, generating a strong magnetic field, steel pipe body under the action of the magnetic field, the magnetic moment obtained or tends to obtain the same direction of alignment with the external magnetic field. When the end of welding, the magnetic field gradually reduced until it disappears, due to the phenomenon of hysteresis, there is residual flux density in the pipe body, which is what we usually call the phenomenon of residual magnetism.
The danger of magnetic field of spiral pipe
The existence of remanent magnetism, so that the image intensifier deflects the direction of the electron beam, the X-ray industrial television system image "S" distortion, affecting the detection rate of natural defects such as porosity, slag, especially not weld through, cracks and other linear natural defects.
With the improvement of the pipeline steel grade and the replacement of the image intensifier of the X-ray television system, the impact of remanent magnetism is particularly prominent.
The presence of residual magnetism in the pipeline ring welding butt, will produce the phenomenon of arc bias, affecting the quality of welding. The existence of residual magnetism seriously affects the quality of construction.
