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Design of Spherical magnetic of welding residual stress measurement instrument
By using nine foot probe, the biggest advantage is that it can reduce measurement error and do not need to rotate when do measurements, with high permeability for the probe, through electromagnetic simulation, optimizing the structure of the probe, shape and number of turns, using phase-shifting circuit, the collected voltage signal can be treated. With the help of theoretical and experimental methods and the calibration of uniaxial and biaxial stress sensitivity coefficient Probe to measure the principal stress difference and principal stress direction angle. Then the shear stress difference method with indirect access to measure the average stress of tested pounds, input the voltage processing software, the software can directly output the stress distribution.