Automotive Crack Testing Magnetic Particle

The process uses an electrical current to produce magnetism in the part being checked, then a solution containing iron powder is sprayed over the part. Since the part is now magnetized the iron powder will get drawn onto the crack where using a black light the crack is plainly shown. Gigantic Ing. Otherwise, without this important step many cracks would go unnoticed, particularly cracks in most parts such as crankshafts, which aren't visible to the naked eye.e process uses an electrical current to produce magnetism in the part being checked, then a solution containing iron powder is sprayed over the part. Since the part is now magnetized the iron powder will get drawn onto the crack where using a black light the crack is plainly shown. Otherwise, without this important step many cracks would go unnoticed, particularly cracks in most parts such as crankshafts, which aren't visible to the naked eye.

Application of Magnetic Particle Inspection in the Field of the Automotive. The crack, the surface of a. Magnetic Particle Inspection, Automotive Industry.

» » Magnetic Particle Crack Detection Basic Knowledge of Crack Detection with Magnetic Particles During the production of steel (casting), during the processing (rolling, forging, welding) and also during the utilization of steel components (bending and tensile loads) cracks can occur. Most often the crack formation begins at the surface and then the crack grows into the material due to stress concentrations at the crack tip. Finally, this can lead to a fatigue fracture of the component. Therefore cracks are the most crucial defect type and must be eliminated by grinding out the crack or scrapping the complete component. The most sensitive method for the detection of surface cracks in ferromagnetic parts is magnetic particle testing (MT). Main Applications • Safety relevant components in the automotive industry. Those are steering, axle and motor components in the state of half finished forged or cast products or in the final machined state.

• Welds on pressure vessels and pipelines Principle Magnetic particle testing of magnetizable metals (mostly steel, less often nickel or cobalt), is well acknowledged by experts. For the inspection the object must be magnetized. In case of large components, which cannot be magnetized completely, only the inspection zone is magnetized. Magnetic field lines which are generated by the magnetization process flow parallel to the surface in the component. Cracks with a perpendicular orientation in relation to the field lines disturb these and create a leakage flux: The field lines exit on one side and enter into the material on the other side, thus creating magnetic poles on the two side of the crack.

Magnetic particle inspection is a nondestructive test method that provides for the detection of linear, surface and near surface discontinuities in ferromagnetic. Is now a widely accepted technique in the automotive, aerospace and railway. Magnetic particle crack detection is of great value in revealing surface flaws in. Introduction to Magnetic Particle Inspection. Testing methods: magnetic flux leakage. South pole will form at each edge of the crack. The magnetic field exits.