The Main Difference Between Ultrasonic Flaw Detector and Eddy Current Flaw Detector

The main differences between ultrasonic flaw detectors and eddy current flaw detectors are divided into three points: different principles, different uses, and different classifications.

Ⅰ. The principles of ultrasonic flaw detector and eddy current flaw detector are different

1. Ultrasonic flaw detection equipment is a method that uses ultrasonic energy to penetrate deep into the metal material, and when one section enters another section, reflection occurs at the edge of the interface to inspect the defect of the part. When the ultrasonic beam passes from the surface of the part The probe is connected to the inside of the metal, and when it encounters a defect and the bottom surface of the part, reflected waves will be generated respectively, and a pulse waveform will be formed on the fluorescent screen, and the position and size of the defect can be judged according to these pulse waveforms.

2. Eddy current flaw detector: The excitation coil is used to generate eddy current in the conductive component, and the change of the eddy current is measured by the detection coil, so as to obtain the relevant information of component defects.

Ⅱ. The purpose of ultrasonic flaw detector and eddy current flaw detector is different

1. The ultrasonic flaw detector can be used not only in the laboratory, but also in the field engineering site. The digital ultrasonic flaw detector can quickly, conveniently, non-destructively and accurately detect various internal defects of metal materials and non-metal materials, such as internal pores, sand holes, inclusions, folds, cracks, incomplete fusion and incomplete penetration of welds in metal materials It can detect, locate, evaluate and diagnose such as shafts, cylinders, seamless steel pipes, straight seam welded pipes and other workpieces in the outer circumferential flaw detection function.

Widely used in scientific research, electric power, petrochemical, metallurgy, casting, automobile, machinery, steel structure, boiler, pipeline, pressure vessel, railway transportation and many other fields of manufacturing, production, quality control, and has been well received by customers. Good economic and social benefits.

2. Eddy current flaw detector: It is only suitable for conductive materials, and can only detect defects on the surface or near the surface layer, which is not suitable for components with complex shapes. In thermal power plants, it is mainly used to detect condenser tubes, steam turbine blades, steam turbine rotor center holes and welds, etc.

Ⅲ. The classification of ultrasonic flaw detector and eddy current flaw detector is different

1. Ultrasonic flaw detectors are divided into longitudinal wave flaw detection, shear wave flaw detection, surface wave flaw detection and plate wave flaw detection.

2. Eddy current flaw detectors can be divided into three types: through type (for wire, rod and pipe detection), probe type (for partial detection of component surface) and insertion type (for internal detection of pipe holes).

Based on the above three points, the choice of ultrasonic flaw detector or eddy current flaw detector in on-site flaw detection needs to be determined according to the inspection requirements of the product under test. For example, when testing pipelines, you need to know the size, specifications, and materials of the pipeline.

Ultrasonic flaw detectors generally require larger pipe diameters for pipes, and the thickness should not be too thin, at least 3mm; eddy current flaw detectors are used to detect some surface or near-surface defects such as air cooler tube bundles, heat exchangers, etc.; of course, the material is also very important parameter.

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