10+ NDT Technician Interview Questions and Answers

The gap between yoke machine legs is the distance between the two legs of the yoke machine.

• The gap is typically adjustable to accommodate different sizes of test objects.

• The size of the gap can affect the sensitivity and performance of the yoke machine.

• For example, a larger gap may be needed for inspecting larger or thicker materials.

• The gap should be set according to the specifications and requirements of the inspection procedure.

Welding fusion throw in joints involves creating a strong bond through heat and pressure, ensuring proper echo pulse categorization.

• Fusion throw refers to the penetration of the weld into the base material.

• Ensure proper joint preparation to achieve optimal fusion.

• Use appropriate welding techniques, such as TIG or MIG, to control heat input.

• Monitor the initial pulse of echo to assess weld quality; it indicates the first reflection from the weld interface.

• Example: In ultrasonic...read more

There are different types of RT (Radiographic Testing) techniques used in NDT.

• RT techniques include film radiography, computed radiography, and digital radiography.

• Each technique has its own advantages and disadvantages.

• Film radiography is the oldest and most traditional method, while digital radiography is the newest and most advanced.

• Computed radiography is a hybrid of film and digital radiography.

• The choice of technique depends on the specific application and the requireme...read more

Fatigue cracks are small cracks that develop in a material due to repeated cyclic loading or stress.

• Fatigue cracks occur when a material is subjected to repeated loading or stress.

• They typically start at stress concentration points or defects in the material.

• Fatigue cracks can propagate and grow over time, leading to failure of the material.

• They are commonly seen in structures such as bridges, aircraft, and machinery.

• Non-destructive testing (NDT) techniques like ultrasonic te...read more

The producer of DPI is the technician, MPI is the magnetic particle manufacturer, RT is the radiographer, and UT is the ultrasonic equipment manufacturer.

• DPI is produced by the technician performing the test

• MPI is produced by the magnetic particle manufacturer providing the materials

• RT is produced by the radiographer performing the test

• UT is produced by the ultrasonic equipment manufacturer providing the equipment

MT principal refers to the principles of Magnetic Particle Testing, a non-destructive testing method.

• MT is a non-destructive testing method used to detect surface and slightly subsurface discontinuities in ferromagnetic materials.

• The two principal methods of MT are the dry method and the wet method.

• The dry method involves applying dry magnetic particles to the surface being tested, while the wet method involves suspending the particles in a liquid carrier.

• The principles of MT...read more

NDT, or Non-Destructive Testing, evaluates materials without causing damage, ensuring weld joint integrity and safety.

• NDT methods include ultrasonic testing, radiographic testing, and magnetic particle testing.

• Ultrasonic testing uses high-frequency sound waves to detect internal flaws in welds.

• Radiographic testing involves X-rays or gamma rays to visualize the internal structure of weld joints.

• Magnetic particle testing detects surface and near-surface defects in ferromagnetic...read more

There are two types of x-ray files: digital and film.

• The two types of x-ray files are digital and film.

• Digital x-ray files are stored electronically and can be easily shared and manipulated.

• Film x-ray files are physical images that need to be developed and stored manually.

• Digital x-ray files are becoming more common in modern medical facilities.

• Film x-ray files are still used in some older medical facilities or for certain types of imaging.

Undercut in NDT can be found by visually inspecting the weld for a groove or depression along the weld toe.

• Visually inspect the weld for any groove or depression along the weld toe

• Use a magnifying glass or microscope for closer examination

• Perform a dye penetrant test to highlight any undercut

• Ultrasonic testing can also be used to detect undercut

• Consult relevant codes and standards for acceptance criteria

I am eager to join as soon as possible, ideally within two weeks, to contribute to the team and projects effectively.

• I am currently wrapping up my responsibilities at my current job.

• I can start immediately if needed, but prefer two weeks for a smooth transition.

• I am excited to bring my skills in NDT to your team and start contributing.

Index point is a reference point used in NDT to mark the location of a defect or anomaly on a test specimen.

• Index point is typically a small mark or indicator placed near the defect for future reference.

• It helps in accurately locating and tracking defects during the inspection process.

• Index points can be physical markers like stickers or paint dots, or digital markers in software applications.

• For example, in ultrasonic testing, index points are used to mark the location of in...read more

DPT stands for Dye Penetrant Testing, a non-destructive testing method used to detect surface-breaking defects in materials.

• DPT is commonly used in industries such as aerospace, automotive, and manufacturing.

• The process involves applying a liquid dye penetrant to the surface of a material, allowing it to seep into any surface-breaking defects.

• After a developer is applied, the excess penetrant is removed, and any defects will be visible as bright indications against a contrast...read more

Ultrasonic Testing (UT) is a non-destructive testing method that uses high frequency sound waves to detect internal flaws in materials.

• UT involves sending ultrasonic waves into a material and analyzing the reflected waves to identify defects

• Commonly used in industries such as aerospace, automotive, and construction

• Can detect flaws such as cracks, voids, and inclusions

• Requires trained technicians to operate specialized equipment