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Common classification of hinges

According to the type of base, it can be divided into detachable type and fixed type;

Introduction to hinge

A hinge is a mechanical device used to connect two solids and allow relative rotation between them.

Difficulties in the detection of steel castings

Coarse crystal grains, uneven structures and other complex interfaces all enhance the scattering of ultrasonic waves, and the energy attenuation is large, so that the detectable thickness is smaller t