Ultrasonic testing involves the interaction of ultrasonic waves with the test piece, and studies the reflection and scattering of the non-destructive testing equipment, and detects and characterizes the macroscopic defect detection, geometrical characteristics measurement, microstructure and mechanical properties of the test piece, and further A technique for evaluating its specific applicability.

The principle of ultrasonic operation: mainly based on the propagation characteristics of ultrasonic waves in the test piece. The sound source generates ultrasonic waves, and the ultrasonic waves enter the test piece in a certain way; the ultrasonic waves propagate in the test piece and interact with the test piece materials and the defects therein, so that the propagation direction or characteristics are changed; the changed ultrasonic waves are passed through the detecting device. Received, and can be processed and analyzed; according to the characteristics of the received ultrasonic waves, the test piece itself and its internal existence are evaluated for defects and defects.

Advantages of ultrasonic testing: It is suitable for non-destructive testing of various parts such as metal, non-metal and composite materials; it has strong penetrating ability and can detect internal defects of test pieces in a large thickness range. For metal materials, thin-walled pipes and plates with a thickness of 1 to 2 mm can be inspected, and steel forgings of several meters in length can be detected; defect positioning is more accurate; detection rate of area-type defects is higher; sensitivity is high, and testability is possible The defects of the internal dimensions are small; the detection cost is low, the speed is fast, the equipment is light, and it is harmless to the human body and the environment, and the field is convenient to use.

The scope of application of ultrasonic testing: from the material of the test object, it can be used for metal, non-metal and composite materials; from the manufacturing process of the test object, it can be used for forgings, castings, welded parts, cemented parts, etc.; In terms of shape, it can be used for plates, bars, pipes, etc.; from the size of the object to be inspected, the thickness can be as small as 1 mm or as large as several meters; from the defect, it can be either a surface defect or an internal defect.