Advantages Of Different NDT Techniques

As most of us know, NDT or nondestructive testing is a procedure mainly utilised to inspect, evaluate or test various assemblies, components or materials for differences in their characteristics or discontinuities, without damaging the functionality of the system or part. In the modern world, they are used as a part of fabrication, in-service and manufacturing inspections for ensuring product quality & integrity. In this blog, we are going to talk about the major advantages of some common non destructive testing methods:

Ultrasonics – used for measuring velocity & density or detecting internal variations & defects.

  • High sensitivity to cracks
  • Very portable
  • Automation possible
  • Permanent records
  • Produces results immediately
  • High penetration

Infrared Thermography – effectively detects or measures heat transfer, electrical assemblies, temperature ranges, hot spots and temperature monitoring.

  • Thermal picture/permanent record
  • Decently portable
  • Remote sensing

Eddy Current – mainly used for detecting surface as well as subsurface seams & cracks.

  • Economical
  • Does not necessitate couplant
  • Probe contact is not required
  • Very fast
  • Permanent records

Liquid Penetrant – can find cracks, seams, laps & porosity, and even move through leaks in walls.

  • Cost effective
  • Indications can be evaluated further
  • Portable

Magnetic Particle – helps to find cracks, inclusions, seams and defects; can also detect really tight cracks.

  • Subsurface flaw detection
  • Affordable
  • Significantly portable

Radiographic Testing – aids in detecting or measuring internal variations & defects, inclusions, deficiency of fusion, porosity, corrosion, density changes, geometry variation, misaligned and misassembled components.

  • Geometry variation has no effect on the pathway of radiation
  • Permanent records
  • Portable

Resonant Inspection – can detect shifts in resonant frequency resulting from alterations in mass, damping or stiffness of a certain component. Flaws like voids, chips, cracks, nodularity, brazing problems, hardness variations, porosity, skipped manufacturing process & delamination are detectable with resonant inspection too.

  • No need to spend anything on consumables
  • Can be automated easily
  • 3 seconds/part
  • Permanent records
  • Whole compotent test for external and internal flaws
  • Designed for being on plant floor
  • Best for quality inspection of high volumes
  • No need for preparation of the particles
  • Objective result

Thus, if you need to make informed decision about which NDT method would be best for inspection of your products, refer to the pros of the ones mentioned above.


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