Low-magnitude fracture, the principle of selecting the detection part: cut the test piece at the parts where the crane wheel forging is prone to overheating; cut the test piece at the minimum deformation of the crane wheel forging; generally, the fracture can be checked on the lateral low-magnification test piece.
Principle of microstructure and detection site selection: the largest cross section of crane wheel forgings (inspection of non-metallic inclusions, grain size); high stress parts of parts (inspection of inclusions, grain size, and overheating); crane wheel forgings have the most severe deformation, Where the temperature rise is the most severe (examination of overheating and grain size); aluminum alloy crane wheel forgings are inspected for overheating and overheating, and samples should be taken at its smallest cross section and close to its surface.
Non-destructive inspection, the principle of selecting the detection site: Non-destructive inspection of crane wheel forgings is mainly performed by ultrasonic inspection. Some crane wheel forgings can also be subjected to non-destructive inspection methods such as fluorescent penetration, magnetic particle deep penetration, and X-ray after rough machining. Ultrasonic inspection is divided into two types: comprehensive inspection and zone inspection. Zoning inspection is to use different sensitivity levels to test different parts of crane wheel forgings. The division of areas should meet the requirements of parts drawings, and corresponding provisions should be made in the drawings of crane wheel forgings.