Visual Inspection | NDT |

 A Non-Destructive method used to examine an object by observation, Known as Visual Testing.

NDT describes a variety of inspection methods that permit inspectors to gather information about a material without hurting it.
Where the most widely used of all NDT techniques is Visual Testing (VT) and it is the oldest of them. Visual testing is the first test, which is performed when an object arrives.
 
As the name suggests When an object is seen visually and determine the flaws on the surface level. In this article, you are going to get complete knowledge about Visual Inspection, from scratch to end.
 
So, Seat back and relax and enjoy the ride of knowledge at your fingertip.
 
Here we go..

What is Visual Testing?

The method of Non-Destructive testing, where the object is inspected through the naked eye or magnifying glass, is known as visual testing NDT.
It is the first NDT method, that is used on any object to inspect. It gives a visual clarification about the object and gives a quick observation result.
 

Advantages of Visual Inspection

There are various advantages of VT, Given below-
  • Low cast 
  • Quick result
  • sensitivity  
  • Applicability to irregular shapes
  • Field Mobility
  • Minimum training required
  • Minimum equipment required
These are some advantages of VT, where I forgot to mention that, There is little or no limitation on the size or shape of the part being inspected.

Disadvantages of Visual Inspection

As visual inspection testing is a very convenient method of NDT and has several advantages over other methods, it lacks its effectiveness sometimes. So, here are the disadvantages of Visual Testing, you should know also-
 
Disadvantages of VT-
  • Applicable to the visual surface only
  • Misinterpretation can happen such as crack and scratch
  • Minor flaws may go undetected
  • Reliability issue 
  • Experience inspector needed

Limitations of Visual Inspection-

VT has some limitations also, it is good to know that too-
  • Needs Adequate lighting
  • Object’s complex geometry may limit the inspection
  • Optical equipment needs to be placed at the adequate viewing angle
  • Some optical instruments may be costly

Applications of Visual Testing

As you know, VT is usually the first method, applied to test objects to detect various flaws, which is given below-
 
Various Applications of VT-
  • Surface discontinuity
  • cracks
  • Misalignment
  • Warping
  • corrosion
  • Wear and Tear
  • Physical Damage 

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Conclusion-

Visual Testing is one of the methods of the broader sector of NDT. Various Methods of NDT are used in various industries and VT is one of them.
 
I have shared most of the topics which should be covered in the Visual Inspection method.
 
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