A Non-Destructive Testing (NDT) technician finds cracks, corrosion, voids and weld flaws in welds, pipes, aircraft parts and bridges without damaging them. You can start with a high school diploma, because most of your training happens through employer-documented hours. Your path: learn the physics and the five core methods (visual, penetrant, magnetic particle, ultrasonic, radiographic), get hours under a certified supervisor, earn Level II certification under your employer's written practice (based on ASNT SNT-TC-1A or NAS 410 in aerospace), then specialize in advanced methods such as phased
See the full roadmap free
Every stage from beginner to expert, with lessons, practice drills, projects, interview questions and free resources. Free with a Rolearch account.
Stage 1 of 3 · about 10 weeks
Understand why flaws form, how each basic NDT method finds them, and read a drawing and a code reference without fear. Be ready to apply for Level I trainee jobs.
Shop math and basic physics
Every method rests on physics: sound travels at a known speed in steel (about 5,900 m/s for longitudinal waves), and X-rays weaken as they pass through thicker metal. If you can do the math, the equipment stops being a black box.
Materials, welding and defect basics
You can only find what you understand. Knowing that lack of fusion, porosity, slag and cracks come from specific welding mistakes tells you where to look and how to describe what you see.
Visual testing (VT) and blueprint reading
VT is the most-used method and the base of all others. Good inspectors see small details, measure them and describe them in clear words. It's also the easiest method to practice at home.
Radiation and workplace safety awareness
You will work at heights, in confined spaces, around chemicals, electrical hazards and, for RT, ionizing radiation. Safe habits protect you and make employers trust you.
Then 2 more stages (about 74 weeks in all) with lessons, drills, projects, 6 interview questions with strong answers and free resources.