This document summarizes various non-destructive testing techniques presented by Sonam Paljor, including ultrasonic testing, magnetic particle testing, eddy current testing, radiography testing, and liquid penetrant testing. It provides details on the types of faults each method can indicate, their applications, advantages, and disadvantages. The final section compares destructive and non-destructive testing, noting that non-destructive techniques allow inspection without damaging the material but require indirect measurements, while destructive testing directly measures material properties but requires loading that damages the sample.
Block diagram reduction techniques in control systems.ppt
Non-destructive testing
1. DEPARTMENT OF MECHANICAL ENGINEERING
Presentation on
“NON-DESTRUCTIVE TESTING”
BY :- SONAM PALJOR(PES1201702403)
2. CONTENTS
Ultrasonic testing
Magnetic particle testing
Eddy current testing
Radiography testing
Liquid penetrant testing
Destructive Vs Non-destructive testing
3. ULTRASONIC TESTING
Types of faults indicated
Crack
Porosity
Inclusions
Lack of fusion
Incomplete penetration
Applications
All types of welded work in metallic
and non-metallic materials.
4. Advantages of Ultrasonic testing
portable
Safe to use
Fast method
High sensitivity
Indicates depth of flow.
Results available immediately.
Disadvantages of Ultrasonic testing
Require surface contact.
Surface must be clean and smooth.
Unsuitable for welding of complex shape.
Require skill operator
6. Advantages of Eddy current testing
Portable
Can be automated
Sensitivity to surface defects.
Can detect through several layer.
Can detect through surface coating.
Accurate conducting measurement.
Disadvantages of Ultrasonic testing
No permanent record.(unless automated)
Signal interpretation required.
Will not detect defects parallel to surface.
Not suitable for large area and complex geometries.
8. Advantages of radiography testing
Disadvantages of radiography testing
Good portability
High sensitivity
No part preparation is required.
Permanent test record is obtained.
Technique standardized
Radiation hazard
Highly directional
Power source needed.
Required skill operator.
The process is generally slow.
Equipment is an expensive.
9. LIQUID PENETRANT TESTING
Types of faults indicated
Cracks
Porosity
Inclusions
Applications
All welds in ferrous and non-ferrous material
and non-metallic material.
10. Advantages of liquid penetrant testing
Disadvantages of liquid penetrant testing
Highly portable
Simple method
Relatively inexpensive
Can be used on variety of materials
Fairly sensitive to fine, tight discontinuities
Rust or paint will mark defects.
Detects surface discontinuities only.
Test surface must be clean and dry.
Only surface defect will be detected.
There is no easy method to produce penetrant record.
11. MAGNETIC PARTICLE TESTING
Types of faults indicated
Cracks
Porosity
Inclusions
Discontinuities surface
Applications
Welds, particularly fillet welds
All ferro magnetic material
12. Advantages of magnetic particle testing
Disadvantages of magnetic particle testing
Highly portable
Immediate result
Generally inexpensive
Fast and relatively simple.
Will work through thin coating.
Difficult to find wide crack.
Material must be ferromagnetic.
Demagnetization may be needed.
Large current sometimes required.
Orientation and strength of magnetic field is critical.
13. DESTRUCTIVE Vs NON-DESTRUCTIVE TESTING
Destructive testing Non-destructive testing
Measurement are direct.
Used for find out the properties
of the material.
Kill is required
Special equipment is required.
Expensive
Load is applied on the material.
Due to load application, material
get damaged.
Examples
• Tensile test
• Compression test
• Hardness test
Measurement are indirect.
Used for find out the properties
of the material.
Less kill
No requirement of special equipment
Less Expensive
Load is not applied on the material.
Non Load is application so, no chance
for material damaged.
Examples
• Eddy current testing
• Ultrasonic testing
• Radiography testing