Ultrasonic testing is a form of non-destructive testing that utilizes the principle of ultrasound, which is the vibration of sound waves greater than the human ear can detect, to detect flaws in a material. It’s one of the most common testing methods used to inspect steel plates, and can be applied to a wide range of materials including metals, plastics, ceramics, and composites.
The use of ultrasound to inspect steel plates has been widely studied and perfected during the past decades. Ultrasonic testing methods are based on the principle of energy transmission. When longitudinal waves of an appropriate frequency, or sound waves, are transmitted into a material, either directly or through an applying wedged transducer, the waves will be partially reflected and partly transmitted back if a discontinuity or defect exists.
The GB 7734-87 standard “Steel plate ultrasonic testing” uses ultrasonic detection equipment to detect flaws in compound steel plates. The standard applies to new and existing compound steel plates, and specifies that steel plates with a thickness greater than or equal to 3mm should be ultrasonically tested. The standard also establishes the detection position, inspection step zone, and sample size requirements. It’s recommend that the-thickness of the sample steel plate should be homogeneous, and the test method is verified by a practical test according to the existing specified procedure.
During ultrasonic testing, a technician uses an ultrasonic detector connected to an electronic control unit to apply the sound waves to the surface of the material. The sound waves will then travel through the material, reflecting any flaws and back to the detector. By studying the reflected waves, the technician is able to detect any imperfections that may exist in the material.
Ultrasonic inspection of steel plates can detect surface and internal flaws such as cracks, inclusions, and weld defects. It’s also able to detect flaws that are invisible to the naked eye. The test is faster, more reliable, and more accurate than other traditional methods, such as visual inspection and x-ray testing. Ultrasonic testing is also much easier and safer to use than traditional methods, as the technician does not need to be in direct contact with the material.
In conclusion, ultrasonic testing is an effective and safe method for detecting flaws in compound steel plates according to the GB 7734-87 standard. This testing method can provide reliable and accurate results, which can be used to ensure the quality and safety of steel plates.
