Mobile magnetic measurement system for control of residual mechanical stresses in steel structures

The paper describes the foundations of the developed calibration-free magnetic method for NDT of the level of residual mechanical stresses in constructions made of low-carbon steels. The new mobile magnetic measurement system is described, which does not require the procedure of preliminary calibration on standard samples. The key elements of the measurement system are the primary converter of the original design, as well as the principle of calculating mechanical stresses over magnetic parameters. The work of measurement system is tested on samples of low-carbon steel with 0.2 % C under the action of compressive loads in the elastic deformation region.