How do we interpret defects in welding by radiographic method?
In a radiograph, dark, jagged asymmetrical shapes within the weld or along the weld joint areas are indicative of slag inclusions. Incomplete penetration (IP) or lack of penetration (LOP) occurs when the weld metal fails to penetrate the joint. It is one of the most objectionable weld discontinuities.
Which type of defects can be detected by radiographic tests?
The defects of weld root include crack, porosity and excess root penetration, lack of penetration and lack of fusion at the root. These defects, if any, will be seen in the middle of welding in radiography film image.
What is radiographic interpretation?
Radiologic interpretation is a complex process which involves the application of an appropriate algorithm in the study of radiologic images and the ability to understand the meaning and to weight the various findings, ultimately contributing to diagnosis.
How the results of radiography can be interpreted?
Radiographic interpretation is based on the visualisation and analysis of opacities on a radiograph. These opacities are formed by the following processes: X-Ray photons have the potential to penetrate tissue. Tissues/objects with a higher atomic number will absorb more radiation than tissues with a lower atomic number.
What are the various welding defects?
Following are the types of welding defects:
- Porosity and Blowholes.
- Undercut.
- Weld crack.
- Incomplete fusion.
- Slag inclusion.
- Incomplete penetration.
- Spatter.
- Distortion.
What is radiographic testing in 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. Energy not absorbed by the object will cause exposure of the radiographic film. These areas will be dark when the film is developed.
How does radiographic testing detect defects in materials?
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).
Why is radiographic interpretation important?
Refining their diagnostic skills and knowledge of anatomy will help clinicians recognize the most common variations in normal radiographs — as well as the most frequently encountered incidental findings.
What is the defect caused by high current in TIG welding?
TIG welding is susceptible to the same type of weld defects you find in MIG welding, such as lack of fusion, burn through, crater/crater cracks, undercut and porosity in the weld metal. All these defects can occur due to improper welding techniques.
What makes a good radiology report?
The report should communicate relevant information about diagnosis, condition, response to therapy, and/or results of a procedure performed. The written report should also answer any clinical question raised by the requesting patient-care provider that is relevant to the radiologic study.