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What are the non destructive tests for welding?
Magnetic Particle Testing, Ultrasonic Testing, Dye Penetrant, Radiography Testing (x-ray), Visual Inspection
How do you examine the welds after the tests and check for weld quality?
You can have visual inspection, x-ray, ultrasound, magnetic testing. The seam can be ground, polished and tested with a stain marker. You can weld a test piece and have it submitted to destructive testing where it's pulled or bent until failure.
Difference between destructive testing and non destructive testing?
Destructive testing will render the part unusable for its intended purpose (e.g. it is cut up for analysis, or fatigue tested for life). Non destructive testing will, after testing, allow the part to be used for its intended purpose (e.g. test for leakage, flow, or resistance).
How do you explain welding defects and explain its testing?
Defects can be varied and classified as critical or non critical. Porosity (bubbles) in the weld are usually acceptable to a certain degree. Slag inclusions, undercut, and cracks are usually non acceptable. Some porosity, cracks, and slag inclusions are visible and may not need further inspection to require their removal. Small defects such as these can be verified by Liquid Penetrant Testing (Dye check). Slag inclusions and cracks just below the surface can be discovered by Magnetic Particle Inspection. Deeper defects can be checked thru X-raying.
What is the role of mechanical inspection engineer?
Doing NDT inspection,thorough examination,load test etc
