Special Bolt is a cylindrical threaded fastener with a nut. A type of fastener consisting of a head and a screw (cylinder with external thread), which needs to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. So do you know what its detection knowledge is? Let’s follow the customized Serrated Flange Nut ZP editor for a simple understanding!
Special Bolt detection is divided into two types: manual and machine. Manual is primitive and uses a more common consistent detection method. In order to minimize the outflow of defective products, the general production company personnel inspect the packaged or shipped products by visual inspection to eliminate defective products (defects include mixing, rust, etc.).

The other method is automatic machine inspection, mainly magnetic particle inspection. Magnetic particle inspection uses the interaction of the leakage magnetic field at the defect of the Special Bolt and the magnetic powder to deal with the difference between the permeability of the Special Bolt (such as cracks, slag inclusions, mixing, etc.) and the permeability of the steel. These materials are magnetized The magnetic field at the discontinuity will be turbulent, forming part of the magnetic flux leakage, and a leakage magnetic field will be generated on the surface of the work piece, thereby attracting the accumulation of magnetic powder at the defect where the magnetic powder is formed-the magnetic mark. Under proper lighting conditions, the defect position and shape will appear. , Observing and explaining the accumulation of these magnetic powders has achieved the purpose of eliminating defective products.
In summary, the editor of the customized Serrated Flange Nut ZP tells: About the introduction of special bolt detection knowledge, I hope you can learn more.