What is radiography test for welding?
Radiographic Testing (RT) – This method of weld testing makes use of X-rays, produced by an X-ray tube, or gamma rays, produced by a radioactive isotope. The basic principle of radiographic inspection of welds is the same as that for medical radiography.
What are the methods used in testing of welding joints?
Destructive weld testing methods.
- Macro etch testing. This method requires the removal of small samples from the welded joint.
- Fillet weld break test. This type of testing involves breaking a sample fillet weld that is welded on one side only.
- Transverse tension test.
- Guided bend test.
What can radiographic testing detect?
Radiographic Testing (RT) is a non-destructive testing (NDT) method which uses either x-rays or gamma rays to examine the internal structure of manufactured components identifying any flaws or defects. In Radiography Testing the test-part is placed between the radiation source and film (or detector).
What is a radiographic image?
It is used to diagnose or treat patients by recording images of the internal structure of the body to assess the presence or absence of disease, foreign objects, and structural damage or anomaly. During a radiographic procedure, an x-ray beam is passed through the body.
Why is radiography test required?
Radiographic testing provides a permanent record in the form of a radiograph and provides a highly sensitive image of the internal structure of the material. The amount of energy absorbed by the object depends on its thickness and density. Energy not absorbed by the object causes exposure of the radiographic film.
What is welding inspection and testing?
Inspection usually involves the examination of completed welds to establish their quality and their confirmation to specifications. Welds in weldments are often tested for soundness, strength, and toughness by mechanical tests. Mechanical tests are destructive tests since the weld joint is destroyed in making the test.
How many types of welding tests are there?
The three most common methods are: Visual weld inspection. Liquid dye penetrant testing. Radiographic testing or x-ray.
What is radiographic method?
During a radiographic procedure, an x-ray beam is passed through the body. A portion of the x-rays are absorbed or scattered by the internal structure and the remaining x-ray pattern is transmitted to a detector so that an image may be recorded for later evaluation.
What is basic principle of radiographic testing?
It is based on the principle that radiation is absorbed and scattered as it passes through an object. If there are variations in thickness or density (e.g. due to defects) in an object, more or less radiation passes through and affects the film exposure.
What is radiology used for?
Radiology, also known as diagnostic imaging, is a series of tests that take pictures or images of parts of the body. The field encompasses two areas — diagnostic radiology and interventional radiology — that both use radiant energy to diagnose and treat diseases.
How are radiographic and ultrasonic weld inspection used?
Radiographic and ultrasonic weld inspection are the two most common methods of non-destructive testing (NDT) used to detect discontinuities within the internal structure of welds. The obvious advantage of both these methods of testing is their ability to help establish the weld’s internal integrity without destroying the welded component.
What kind of testing is done on welds?
Radiographic and Ultrasonic Testing of Welds. Radiographic and ultrasonic weld inspection are the two most common methods of non-destructive testing (NDT) used to detect discontinuities within the internal structure of welds.
How are welds used in medical radiography?
The basic principle of radiographic inspection of welds is the same as that for medical radiography. Penetrating radiation is passed through a solid object, in this case a weld rather that part of the human body, onto a photographic film, resulting in an image of the object’s internal structure being deposited on the film.
How many welds can be radiographed in a pipe?
Where random radiography is specified, the first weld of each welder shall be completely radiographed. In the case of pipe of size 6″ and below, the first two welds shall be completely radiographed. For each weld performed by a welder found unacceptable, two additional checks shall be carried out on welds performed by the same welder.