Description
NDT Stands for Non-Destructive Testing. In Other Words, It Is
A Way of Testing Without Destroying. This Means That the
Component- The Casting, Weld or Forging, Can Continue to Be
Used and That the Nondestructive Testing Method Has Done No
Harm. In Today's World Where New Materials Are Being
Developed, Older Materials and Bonding Methods Are Being
Subjected to Higher Pressures and Loads, NDT Ensures That
Materials Can Continue to Operate to Their Highest Capacity
With The Assurance That They Will Not Fail Within
Predetermined Time Limits. NDT Can Be Used to Ensure the
Quality Right from Raw Material Stage Through Fabrication and
Processing to Pre-Service and In-Service Inspection. Apart
From Ensuring the Structural Integrity, Quality and
Reliability of Components and Plants, Today NDT Finds
Extensive Applications for Condition Monitoring, Residual Life
Assessment, Energy Audit, Etc.
There Are Many NDT Techniques/Methods Used, Depending On Four
Main Criteria:
Material Type
Defect Type
Defect Size
Defect Location
Liquid Penetrant Testing (PT)
Liquid Penetrant Testing Involves the Application of a Fluid
With Low Viscosity to The Material to Be Tested. This Fluid
Seeps into Any Defects Such as Cracks or Porosity Before A
Developer Is Applied Which Allows the Penetrant Liquid to Seep
Upwards and Create A Visible Indication of The Flaw. Liquid
Penetrant Tests Can Be Conducted Using Solvent Removable
Penetrants, Water Washable Penetrants or Post-Emulsifiable
Penetrants. TWG INTERNATIONAL Providing Quality Trainings on
Liquid Penetrant Testing (PT) and all NDT Courses.
Magnetic Particle Testing (MT)
This NDT Process Uses Magnetic Fields to Find Discontinuities
At or Near the Surface of Ferromagnetic Materials. The
Magnetic Field Can Be Created with A Permanent Magnet or An
Electromagnet, Which Requires A Current to Be Applied.
The Magnetic Field Will Highlight Any Discontinuities as The
Magnetic Flux Lines Produce Leakage, Which Can Be Seen by
Using Magnetic Particles That Are Drawn into The
Discontinuity. In Hyderabad Liquid Penetrant Testing (PT)
Trainings will be provided, TWG INTERNATIONAL institute is
Best Known for Quality and NDT Courses.
Radiographic Testing (RT)
Radiographic Testing Uses Radiation Passed Through A Test
Piece to Detect Defects. X-Rays Are Commonly Used for Thin or
Less Dense Materials While Gamma Rays Are Used for Thicker or
Denser Items. The Results Can Be Processed Using Film
Radiography, Computed Radiography, Computed Tomography or
Digital Radiography. Whichever Method Is Used, The Radiation
Will Show Discontinuities in The Material Due to The Strength
Of The Radiation.
Ultrasonic Testing (UT)
Ultrasonic Testing Entails the Transmission of High Frequency
Sound into A Material to Interact with Features Within the
Material That Reflect Or Attenuate It. Ultrasonic Testing Is
Broadly Divided Into Pulse Echo (PE), Through Transmission
(TT) And Time Of Flight Diffraction (TOFD).