NDT Appreciation
An introduction to the concepts of Non-Destructive Testing (NDT); this course is intended for those wanting to achieve basic understanding of methods , techniques and role of Non-Destructing testing in the Engineering, Fabrication and Construction industries.
Extensive hand-on experience is available allowing basic tests to be performed. This course is ideal for beginners and can be oriented towards senior managers, consulting engineers, chief inspectors and surveyors, as well as those directly involved in standing a career in Non-destructive testing activities that require an initial general approach.
Duration 3 Days
Study Guides, Study Guides and Practical
Study Guides, Study Guides and Practical
Certification
Only course completion (CC) certificates issued
Special Notes
Only course completion (CC) certificates issued.
- This is an ideal course for personnel at all levels wanting as overview of common NDT techniques.
- Applic able NDT methods: RT- Radiographic Testing, RI- Radiographic film interpretation, LPT – Liquid Penetrant Testing, MT- magnetic Particle Testing and UT-Ultrasonic Testing.
Overall Course content
- The main methods of non-destructive testing with demonstrations (including Magnetic particle testing, Penetrant testing, Ultrasonic flaw detection and Radiographic interpretation)
- The limitations of each method of testing.
- Advantages and Disadvantages of each method of testing.
- electing specific NDT method in relation to discontinuity orientation and materials.
- Certification schemes
- Relevant Codes, Standards and Specifications
- Reporting.
Course Syllabus
- Introduction to NDT
- Destructive vs Non Destructive Testing
- Discontinuities: Surface, Sub-Surface & Internal
- Defects
Basic principles of Liquid Penetrant testing (LPT)
- Purpose of Liquid Penetrant testing
- Types of Liquid Penetrants commercially available
- Preparation of parts
- Adequate lighting for inspection
- Application of Penetrant to parts
- Penetrant Dwell time and Excess penetrant removal
- Developer application
- Post cleaning
- Appearance of Penetrant Indications
- Type on Indication: True, Relevant, Non Relevant and False.
- Acceptance Criteria for penetrant indications
Basic Principles of magnetic particle Testing (MT)
- Theory of magnetism
- Magnetic poles
- leming’s Right and Left hand rule
- Materials: Diamagnetic, Para magnetic and Ferro magnetic
- Characteristics of Bar and Ring magnets
- Effect of discontinuities of materials: Surface Cracks, Scratches and Sub surface defects.
- Magnetic Fields: circular and Longitudinal
- Working principles of AC/DC Electromagnetic yoke, Permanent magnets, Coil methods, Prods and Head shots.
- Appearance of Penetrant Indications
- Type on Indication: True, Relevant, Non Relevant and False.
- Type of current used in Magnetic particle Testing
- Lighting requirements
- Surface preparation and method of Wet/Dry detecting media application.
- Direction of magnetic field in relation to discontinuity orientation
- Indication Types: True, Relevant, Non Relevant and False
- Acceptance Criteria for Magnetic particle indications
- Inspection procedure: Continues and Residual
- Material permeability and Reluctance
- Retentivity/Residual field, Coercive force & Demagnetization.
- Interpretation and Evaluation of Magnetic particle Indications
- Post Cleaning
Basic principles of Ultrasonic Testing (UT)
- Nature of sound waves
- Modes of sound wave generation
- Velocity, Frequency and Wave length of sound waves
- Attenuation of sound waves
- Acoustic Impedance
- Incident, Reflection, Refraction and Mode conversion of sound waves.
- Snell’s law
- Dead Zone, Near Zone and Far Zone
- A- scan pulse echo equipment and digital thickness gauging Machines
- Piezo electric effect
- Type of sound waves: Longitudinal and shear
- Beam spread
- Transducers: Straight, Angle and Dual
- Sensitivity and Resolution
- Selection of couplant and probe frequency
- Calibration blocks and equipment calibration
- Origin and typical orientation of discontinuities
- Response of discontinuities to ultrasound
- Retentivity/Residual field, Coercive force & Demagnetization.
- Applicable codes and standards
Basic Principles of Radiographic Testing (RT);br Interpretation of Radiographs (RI)
- Production of X and Gamma rays
- Inverse square law
- Radiographic techniques: SWSI, DWSI and Panoramic.
- Radiographic sensitivity
- Radiographic contrast
- Film contrast
- Unsharpness
- Source to Film distance (SFD)
- Source to object and object to film distance
- Lead Intensifying screens and film cassettes
- Image quality Indicators (IQI)
- Film handling, loading and Processing
- Film illuminator Requirements
- Penetrameter placement
- Personnel dark adaptation and visual acuity
- Film identification
- Location markers
- Film density measurement
- Film Artifacts
- Origin and typical orientation of discontinuities
- Radiographic appearance
- Applicable codes and standards
- Acceptable radiographic techniques and setups