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:
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.
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 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 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).
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