Monday, December 19, 2016

Use Radiographic and Ultrasonic Testing System, for Better Methods to detect flaws in the internal structure of the welding




Radiographic and Ultrasonic Testing uses two of the most common methods of non-destructive testing (NDT) to detect flaws in the internal structure of the welding. The obvious advantage of this second method of testing is its ability to assist in the construction of internal welding without damaging the integrity of welded components.

Welding test method uses X-rays, generated by the X-ray tube, or gamma rays, which were created by the radioactive isotopes. The basic principle of the Radiographic examination of welds is similar to those in the medical radiography. The rays penetrate through solid objects pass, in this case welding a fraction of the human body, to a photographic film, which resulted in images of internal structures of objects stored on the film. The amount of energy absorbed by the body depends on the thickness and density.

Ultrasonic Testing


Radiographic Examination, Appropriate Method to get both sides of the welding connection

Radiographic and Ultrasonic Testing examination can provide a permanent record of the films of high quality welding. Those are relatively easy to interpret by trained personnel. This test method is usually appropriate to get both sides of the welding connection (with the exception of the double wall technique image used in some plumbing signals). Though this is a slow and expensive non destructive testing method, it is a positive method for the detection of porosity, inclusions, cracks, and voids in the interior of the welding.

It is important that qualified personnel perform radiographic interpretation due to misinterpretation of radiation can be expensive and seriously interfere with productivity. There are safety considerations when making clear Radiographic and Ultrasonic Testing. X-rays and gamma rays are not visible to the naked eye and can have effects on their health and safety. Only trained and qualified personnel must exercise this kind of testing.


Ultrasonic Testing Test Method uses converter to converts electrical energy into mechanical energy

Ultrasonic Testing (UT) test method uses mechanical vibrations similar to sound waves, but of high frequency. It is directed beam of ultrasonic energy to an object to be tested. This beam is traveling through the object with big losses, but when he intercepted it and reflected interruption. The connection uses pulse inversion technique, ultrasonic. Radiographic and Ultrasonic Testing system uses converter converts electrical energy into mechanical energy. Fondness for high-frequency transformer voltage causes the crystal to vibrate mechanically.

Achieve the crystal into the source of mechanical vibrations ultrasound. These vibrations are transmitted to the test piece through a coupling liquid, usually oil film, which is called couplant. When it hits the pulse wave ultrasonic disruption in the test piece, and is reflected back to the point of origin.


Conclusion

One of the most useful features of the Radiographic and Ultrasonic Testing especially for ultrasound test is its ability to determine the exact position of the discontinuities in welds. This test method requires a high level of training and competence of the operator depending on the formation and implementation of appropriate testing procedures and can be used for this test method on ferrous materials and non-ferrous. It is often appropriate to test the thick portion can be accessed from one side only, and are often able to detect minute or disability lines more clearly that cannot be readily detected by radiographic tests.


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