Investigation of the Impact of Load on the Magnetic Field Strength of the Crane by the Magnetic Metal Memory Technique

Abstract

The paper deals with the problem of applicability of the metal magnetic memory (MMM) technique in the crane structural inspection and monitoring. The MMM method does not require the external magnetization of a structure that results in reduction of downtime of maintenance operations. Measurement of the intensity of the self-magnetic leakage signal can be an alternative to other non-destructive methods used for inspection of a large crane’s structure and equipment. However, the complexity of the residual magnetization effect in the MMM technique is the problem with its application. Thus, the magnetic flux leakage behavior on the crane girder surface under different measurements and the crane’s load conditions is analyzed based on the results obtained during experiments carried out on the overhead traveling crane.

Using Metal Magnetic Memory to Evaluate the Effect of Welding Method and Weld Temperature on Magnetic Field Strength in Structural Steel

“…MMM is a passive non-destructive magnetic method using self-magnetic leakage field distribution (SMLF) on the surface of materials. The variation of the SMFL signal is related to many factors, such as the initial magnetic field, microstructure, chemical composition, and shape and size of ferromagnetic materials [3][4][5][6]. The value measured in the test is the value of the selected component of the magnetic field strength H measured near the diagnosed object, represented by Formula (1).…”