Learn NDT
Basic NDT articles: MT, PT, UT, VT, ET, RT and Level II certification.
-
MT · NDT METHOD
What is Magnetic Particle Testing (MT)? Principle, equipment and steps
Magnetic Particle Testing (MT) finds surface cracks in steel using a magnetic field and fine iron particles. Learn the principle, equipment, steps and limits.
24 October 2026 · 3 min read -
UT · NDT METHOD
What is Ultrasonic Testing (UT)? Principle, equipment and examples
Ultrasonic Testing (UT) uses high-frequency sound to find flaws inside a material. Learn how it works, the equipment, the basic steps and real examples.
24 October 2026 · 3 min read -
PT · NDT METHOD
What is Penetrant Testing (PT)? Principle, materials and steps
Penetrant Testing (PT) finds surface-breaking cracks with a liquid penetrant and a developer. Learn the principle, penetrant types and the six basic steps.
24 October 2026 · 3 min read -
VT · NDT METHOD
What is Visual Testing (VT)? Visual weld inspection and its tools
Visual Testing (VT) is the first and most widely used NDT method for welds. Learn direct and remote VT, lighting requirements, measuring tools and weld flaws.
24 October 2026 · 3 min read -
ET · NDT METHOD
What is Eddy Current Testing (ET)? Principle, probes and applications
Eddy Current Testing (ET) uses electromagnetic induction to find cracks and measure conductivity and coating thickness. Learn the principle, probes and uses.
24 October 2026 · 3 min read -
RT · NDT METHOD
What is Radiographic Testing (RT)? Principle, radiation sources and film interpretation
Radiographic Testing (RT) uses X-rays or gamma rays to see inside welds and castings. Learn the principle, equipment, steps, flaws and radiation safety.
24 October 2026 · 3 min read -
CERTIFICATION · SNT-TC-1A
NDT Level II certification under SNT-TC-1A: how it works, exams and requirements
How NDT Level II certification works under SNT-TC-1A: the written practice, the three exams, pass marks, vision tests, and how it differs from ISO 9712.
24 October 2026 · 3 min read -
CERTIFICATION · SNT-TC-1A
NDT Level I vs Level II vs Level III: what's the difference?
What is the difference between NDT Level I, Level II and Level III? Duties, responsibilities, exams and who may accept or reject results, under SNT-TC-1A.
24 October 2026 · 3 min read