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Time: Jun-22-2018

Bolts :mechanical parts, cylindrical threaded fasteners with nuts.A fastener consisting of two parts of the head and the screw (the cylinder with the external screw) shall be fitted with the nut to tighten the connection of two parts with a pass hole.This form of connection is called bolted connection.If you screw the nut from the bolt, you can separate the two parts, so the bolt connection is a removable connection.Bolt detection can be divided into two kinds: artificial and machine.
Artificial is the most primitive and the most commonly used uniform detection method.In order to minimize the bad product outflow, average production enterprise personnel treat packing or delivery of products by means of visual inspection, to eliminate non-conforming (bad tooth injury, mixing, rust, etc.).

Another method is automatic detection of machine, mainly magnetic particle inspection.
Magnetic particle inspection defect of the leakage magnetic field is the use of bolt and the interaction of magnetic powder, bolts for possible defects (such as cracks, slag inclusion, mixing, etc.) permeability and steel permeability difference, these materials after magnetization of the magnetic field discontinuity battery change will occur, forming part of the magnetic flux leak occurs on the surface of work piece leakage magnetic field, so as to attract the magnetic powder form of defect magnetic powder – magnetic mark, under the condition of appropriate lighting, showing defects location and shape, to observe the accumulation of magnetic powder and explanation, has reached to weed out the purpose of the defective product.