Visual Testing (VT) Levels 1 & 2 for Welding
ASNT Certification Framework
The ASNT Certification Framework
In the world of Non-Destructive Testing (NDT), certifications aren't just suggestions; they are structured requirements that ensure safety and quality. The primary guideline for this in the United States is the American Society for Nondestructive Testing's document, . This document provides a framework for companies to create their own certification programs.
This leads to a crucial component: the Employer’s Written Practice. This is the company-specific rulebook for qualifying and certifying NDT personnel. While it's based on SNT-TC-1A, it's tailored to the company's unique operations. As a Quality Control Engineer, you will operate entirely within the bounds of your employer's Written Practice. It dictates the training hours, experience, and examination scores required for you to advance.
From Level 1 to Level 2
The ASNT framework outlines three basic levels of qualification. For Visual Testing (VT), the distinction between Level 1 and Level 2 is significant.
A Level 1 inspector is qualified to perform specific calibrations and tests under the supervision of a Level 2 or Level 3 individual. They follow established procedures and can record test results, but they cannot independently interpret those results or write the final report.
A Level 2 inspector, however, has much broader responsibilities. You'll be qualified to set up and calibrate equipment, conduct inspections, and most importantly, interpret and evaluate the results. This includes accepting or rejecting components based on codes and standards. Level 2s can also organize and report the results of the inspection and provide guidance to Level 1 trainees.
Think of it this way: a Level 1 inspector can run the test, but a Level 2 inspector understands what the results mean and what to do about them.
The Path to Certification
Becoming a certified Level 2 VT inspector involves meeting several strict requirements defined in your employer's Written Practice.
First, there are physical requirements. NDT relies on the inspector's senses, and for Visual Testing, that means vision is paramount. You must pass a vision test to prove you can see clearly at close distances. The standard requirement is the ability to read text at a distance of not less than 12 inches, with or without corrective lenses. You'll also be tested for color blindness.
Next is experience. You must document your On-the-Job Training (OJT) hours. These hours are spent performing inspections under supervision, and the specific number required is laid out in the Written Practice. Meticulous record-keeping is essential, as these logs are audited to verify your hands-on experience before you can sit for the certification exams.
Finally, you must pass a three-part examination.
| Exam Part | Description | Passing Score |
|---|---|---|
| General | Covers the fundamental principles and theory of the NDT method (Visual Testing). | Varies by Written Practice |
| Specific | Tests knowledge of the specific equipment, procedures, and standards used by the employer. | Varies by Written Practice |
| Practical | A hands-on test where you must demonstrate your ability to use VT equipment and interpret flawed specimens. | Varies by Written Practice |
While the passing score for each individual part may vary, SNT-TC-1A requires a composite score of 80% or higher across all three exams to achieve certification. This ensures a comprehensive understanding of both theory and practical application.
What is the primary role of the ASNT's SNT-TC-1A document in NDT certification?
Which of the following tasks can a Level 2 Visual Testing (VT) inspector perform that a Level 1 inspector cannot?
Once certified, a Level 2 inspector is entrusted with the critical task of ensuring components meet quality and safety standards, a responsibility that is fundamental to the integrity of operations in the oil and gas industry.