Compared with magnetic particle detection and ray detection

magnetic memory detection is more sensitive. The magnetic memory technology is employed to carry out nondestructive testing and evaluation for weld defects of 20 steel plate. The results show that

the magnetic memory detection method can effectively characterize the weld defects of steel plates. Compared with the magnetic field intensity parameter

the magnetic field gradient value is more sensitive to the weld defects of the four tested steel plates

which manifested as its normal component increases significantly and presents a convex peak

and the abnormal magnetic memory signals also appear in some places of the weld with local stress concentration. In practical application

the rapid characteristics of the magnetic memory detection technology can be used to extract the abnormal signals of the weld seam of the tested components at first

and then compare it with other non-destructive testing methods

to effectively improve the accuracy and reliability of defect detection.