Hiring an NDT Level I technician is one of the most important investments you can make in your quality program. This individual is the foundation of your inspection team, responsible for executing procedures with precision and unwavering attention to detail. A bad hire at this level can lead to procedural drift, safety incidents, and costly rework.
A robust interview process for a UT Level I goes beyond just verifying a training certificate. It needs to assess three key areas: their safety mindset, their grasp of fundamental UT principles, and, most importantly, their ability to follow written instructions without deviation.
This interview kit provides a two-part framework—a set of targeted questions and a hands-on practical screen—to help you identify a candidate who has the potential to become a top-tier NDT professional.
Part 1: Targeted Interview Questions
The goal of these questions is to understand the candidate’s thought process, attitude, and foundational knowledge.
Category 1: Safety and Professionalism
Safety is non-negotiable. These questions probe their understanding of industrial safety culture.
- Question: “You’re on-site and notice a senior technician isn’t wearing the required safety glasses in a designated area. What do you do?”
- What to Look For: The only correct answer involves prioritizing safety over hierarchy. A good candidate would state they would politely remind the technician of the rule or report the situation to a supervisor. Hesitation or saying “I wouldn’t do anything” is a major red flag.
- Question: “Describe the first things you would do when arriving at a new, unfamiliar job site.”
- What to Look For: The answer should revolve around a “Stop, Look, Listen” approach. Look for keywords like “attend the safety briefing,” “identify hazards,” “locate muster points,” “understand the permit-to-work system,” and “review the Job Safety Analysis (JSA).”
Category 2: Theoretical Knowledge
These questions verify that the candidate retained the core concepts from their classroom training. The basis for this knowledge is often outlined in training standards like ASNT’s CP-105.
- Question: “In your own words, what is the basic principle of ultrasonic testing? How does it find a flaw?”
- What to Look For: They should be able to explain the concept of sending a high-frequency sound wave into a material and listening for the echo from a reflector (like the back wall or a discontinuity).
- Question: “What is the difference between a longitudinal wave and a shear wave?”
- What to Look For: A solid answer will state that longitudinal waves (used in straight beam testing) have particle motion parallel to the wave direction, while shear waves (used in angle beam testing) have particle motion perpendicular to the wave direction.
- Question: “Why do we use couplant?”
- What to Look For: The candidate should explain that sound waves do not travel well through air, and couplant is used to displace the air between the transducer and the test piece, allowing the sound to enter the material efficiently.
Category 3: Procedural Adherence
This is the most critical function of a Level I technician. According to SNT-TC-1A, a Level I must follow specific, written instructions.
- Question: “Imagine you are performing an inspection and the written procedure calls for a specific 5 MHz probe, but you only have a 2.25 MHz probe available. What is the correct course of action?”
- What to Look For: The only acceptable answer is to stop work and report the situation to their supervising Level II or Level III. Any answer that involves improvising or proceeding with the wrong equipment demonstrates a fundamental misunderstanding of the Level I role.
- Question: “Why is it important to document every inspection, even if no flaws are found?”
- What to Look For: Look for an understanding that the report is the final, auditable product of the inspection. It provides a permanent record that the component was inspected and found to be acceptable at that time, which is critical for safety and traceability.
A great interview process starts with a great pool of candidates. Find them on NDT-Jobs.com.
Part 2: The Hands-On Practical Screen
This is where you verify that a candidate can translate their knowledge into action. The test should be administered by a qualified Level II or Level III in a controlled environment. The goal is not to test their interpretation skills, but their ability to follow a procedure.
Setup:
- Equipment: A basic UT flaw detector, a straight beam transducer, an angle beam transducer with a wedge, and standard calibration blocks (e.g., IIW Type 1 or a DSC block).
- Procedure: A simple, one-page, step-by-step written procedure for calibrating the instrument for both a straight beam and an angle beam inspection.
- Test Piece: A simple test plate with a few known, easy-to-find reflectors like a side-drilled hole or a flat-bottom hole.
The Task (Under 100% Supervision):
- Provide the Procedure: Hand the candidate the written calibration procedure and the equipment. State clearly: “Please follow this procedure exactly to calibrate this instrument.”
- Observe the Calibration: Watch them carefully.
- Are they reading and following each step in order?
- Are they handling the equipment with care?
- When they finish, is the instrument calibrated correctly according to the procedure?
- Perform the Scan: Once calibrated, ask them to scan the test plate as directed in the procedure.
- Ask for Results: When their scan reveals an indication, ask them: “According to the procedure, what information would you be required to record about this indication?”
What to Look For During the Practical:
- Procedural Adherence (Priority #1): Did they follow the written instructions to the letter? Or did they try to do it from memory and miss a step? A candidate who meticulously follows the paper in front of them is exactly what you want in a Level I.
- Coachability: If they make a mistake and you correct them, how do they respond? Are they receptive to feedback, or do they get defensive?
- Attention to Detail: Are their actions deliberate and precise? Do they demonstrate a foundational level of hand-eye coordination?
Hiring a Level I is about potential. By using this structured interview kit, you can look past the certificate and identify a candidate with the right attitude, aptitude, and respect for procedure to become a long-term asset to your NDT team.
Ready to build a team of top-tier NDT professionals? Post your job on NDT-Jobs.com today!