The ASNT Phased Array Level II certification validates an NDT professional's proficiency in Phased Array Ultrasonic Testing (PAUT). This advanced form of ultrasonic testing uses specialized multi-element probes and powerful software to create detailed, cross-sectional images of a component’s internal structure, comparable to medical CT scans.
A Level II individual is qualified to set up and calibrate equipment, conduct inspections according to established procedures, interpret and evaluate results with respect to applicable codes and standards, and organize and report those results. This certification is designed for NDT technicians who have foundational knowledge in conventional Ultrasonics (UT) and are looking to master a highly sought-after skill, increasing their precision and marketability in industries like oil and gas, power generation, aerospace, and manufacturing.
To quality for the examination, candidates must complete a formal training course, which typically requires 80 hours of classroom or equivalent instruction beyond the Level I requirements. The curriculum is detailed in ASNT Recommended Practice No. SNT-TC-1A and ANSI/ASNT CP-189. Core topics include:
Principles of Phased Array UT: Advanced wave physics, including interference, diffraction, and beam steering.
PAUT Hardware: In-depth knowledge of multi-element probes (linear, matrix, annular), wedges, and sophisticated instruments.
Beam Shaping and Focusing: Theory of focal laws, delay patterns, electronic focusing, and dynamic depth focusing.
Scanning Techniques: Setup and implementation of various scans, including sectorial (S-scan), linear (E-scan), and depth scans.
Data Imaging: Mastering the interpretation of A-scan, B-scan, C-scan, and complex composite views.
Equipment Setup and Calibration: Procedural steps for velocity, wedge delay, sensitivity, and TCG/DAC calibration.
Defect Detection and Sizing: Applying advanced PAUT to identify, locate, and accurately size discontinuities in welds, forgings, and composite materials.
Codes and Standards: Application of relevant industry codes (e.g., ASME Section V, API 1104, AWS D1.1).
The final ASNT Level II examination for Phased Array is a multi-part process, often encompassing three distinct components, depending on whether you are pursuing a central certification (like ASNT’s ACCP) or an employer-based qualification. A typical Level II exam structure includes:
General Examination: A multiple-choice, closed-book test covering the basic principles, theory, and techniques of Phased Array Ultrasonic Testing.
Specific Examination: A multiple-choice, closed-book test that focuses on the application of PAUT within a particular industrial sector, adhering to specific codes, standards, and specifications.
Practical Examination: A hands-on, face-to-face test where the candidate must demonstrate practical proficiency. This includes setting up the PAUT equipment, calibrating the probe and wedge, scanning known test specimens, and accurately detecting, characterizing, and sizing discontinuities, then documenting the results in a report.
Candidates generally must achieve a composite score of 80% to pass, with no individual section scoring below 70%.
Effective preparation requires a blend of theoretical study and rigorous hands-on practice. Here is a winning strategy:
Take a Mandatory Training Course: This is an essential prerequisite and the best way to grasp the complex theory.
Leverage ASNT Materials: Study the ASNT NDT Handbook, Phased Array Question and Answer Books, and relevant Study Guides.
Practice with Real Equipment: Maximize your hands-on time with the same PAUT instruments and software you will use in the field.
Master Scan Planning: Become adept at using modeling software to develop effective scan plans for different component geometries.
Use Practice Exams: Take as many practice tests as possible to familiarize yourself with the question style and time constraints.
Review Key Codes: Dedicate significant time to understanding the essential PAUT sections within common codes like ASME, API, and AWS.
Where to Take the Exam: The multiple-choice General and Specific written exams are often administered as computer-based tests at Pearson VUE professional testing centers worldwide. The Practical examination must be arranged separately and is typically taken at an ASNT Authorized Exam Center (AEC) or through your employer if they maintain an internal SNT-TC-1A qualification program.
A Level II Phased Array certification opens doors to specialized roles and significantly enhances your career trajectory within the NDT field. Demand is high for these skilled technicians. Common job titles include:
Non-Destructive Testing (NDT) Inspector
PAUT Technician / Phased Array Technician
Ultrasonic Testing (UT) Level II Specialist
Welding Inspector (with PAUT Endorsement)
Integrity Engineer / Inspection Engineer
Quality Control (QC) Technician
Aerospace NDT Technician
Pipeline Integrity Inspector
Corrosion Mapping Technician
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