Method for monitoring magnetic suspension concentration in flaw detection process

Abstract

The invention discloses a method for monitoring the magnetic suspension concentration in a flaw detection process, and the method comprises the steps: selecting a workpiece; pasting an Al-15 / 50 test piece on the surface of the workpiece; clamping the workpiece on a clamping electrode of a magnetic particle flaw detector; determining a circumferential magnetization current value and longitudinal magnetization ampere turns according to the magnetic particle flaw detection standard of the workpiece; carrying out the magnetization and spraying of the workpiece according to a wet process continuous method magnetic particle flaw detection technology, and observing the display condition of the test piece; observing the display concentration degree of an artificial notch groove of the test piece and the surrounding background magnetic particle concentration degree of the artificial notch groove of the test piece, and carrying out the comparison with a preset magnetic suspension concentration-test piece display comparison table, thereby determining the section of the of the magnetic suspension concentration used in the flaw detection process. The method can check the magnetic suspension concentration in a working section, and reduces the waste of the work hour.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a method for monitoring the concentration range of a magnetic suspension during the flaw detection process using a magnetic particle flaw detector. Background technique [0002] The concentration of the magnetic suspension is an important index in the wet magnetic particle inspection. It is directly related to the sensitivity of the inspection, to the density and clarity of the test piece display, and to whether the defects on the workpiece can be clearly displayed in the future without causing missed detection. The magnetic particle flaw detection standard has specific regulations on the conical long-necked sedimentation tube used to measure the concentration of the magnetic suspension, the sampling method of the magnetic suspension concentration, the sampling value, and the precipitation time. Concentration measurement, observe whether the concentration of the magnetic su...

AI Technical Summary

Problems solved by technology

The standard stipulates that there is an interval for the concentration of the magnetic suspension. Theoretically, it is also qualified to check the concentration of the magnetic suspension when it reaches the lower limit. or longer, it won't work

Since the magnetic powder will be adsorbed on the workpiece and taken away during the flaw detection process, the concentration of the magnetic suspension will gradually decrease with the increase in the number of flaw detection workpieces. Once the concentration is lower than the critical value, it may lead to missed detection.

When the concentration of the magnetic suspension is found to be lower than the lower limit at the end of the work, an appropriate amount of magnetic powder and carrier liquid must be added. After the concentration measurement is qualified, all the workpieces detected in this shift will be re-inspected, wasting half the working time of the shift, and the workpieces will be circulated. will also delay

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