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Top 3 Basic Principles of Nondestructive Testing

calendar Jun. 21, 2022user-iconTXNDT

Nondestructive testing is an industry that involves a variety of inspection methods that test assets and components for surface and subsurface flaws.

The assets inspected through nondestructive testing are in critical fields such as aerospace, renewable energy, and infrastructure. As such, it is critical that the procedures of nondestructive testing are incredibly precise to ensure that no flaws in the assets under inspection are missed.

The different inspection methods of nondestructive testing are very thorough and highly scientific. In fact, nondestructive testing methods are actually divided based on the specific scientific principles to which they adhere to yield results.

Each method of nondestructive testing follows a different scientific principle; here are some of the most commonly used methods and the top 3 principles of nondestructive testing that every technician should understand.

1. Principles of Liquid Penetrant Testing

Liquid penetrant testing follows the principles of capillary action to achieve results and identify a flaw. A low-viscosity liquid is applied to the surface of the part or component under inspection. After a dwelling time, the excess liquid or penetrant is removed, and any present flaws will be indicated when the remaining penetrant flows back out of the flaws or fissures.

Liquid penetrant testing is a critical method to learn as a nondestructive testing technician, as it is often chosen due to its ease of use and high portability.

2. Principles of Magnetic Particle Testing

Magnetic particle testing employs the basic principles of magnetism and the use of magnetic fields to identify surface or near surface flaws in ferromagnetic assets and components.

A magnetic field can be applied to the asset through either direct or indirect methods using yokes,, coils, or a central conductor.

When this method is used, a fine pigmented powder is applied to the surface of the part. Then, if a flaw is present, a magnetic leakage field will be caused by the discontinuity, leading to a visible indication.

Understanding the principles of magnetic particle testing is important because it is a low-cost, highly portable method of nondestructive testing.

3. Principles of Ultrasonic Testing

As its name suggests, ultrasonic testing uses the principles of ultrasound technology to identify flaws in assets.

High-frequency sound waves travel through the part, and if the sound waves hit material with a different acoustical impedance, the sound will reflect back and indicate a crack or fissure.

It is especially important for technicians to understand the intricacies of this principle because it can provide vital information about the precise location of the flaw.

Contact TXNDT Today!

NDT technicians don’t have to have an engineering degree, but nondestructive testing requires sophisticated knowledge regarding the scientific principles of nondestructive testing methods.

If you are looking for nondestructive testing services to support your business and protect your assets or to become a technician yourself through NDT technician training, it’s crucial to choose the right company or school to meet your NDT needs.

Whether you find yourself asking: What is nondestructive testing? or you are looking to continue your education, TXNDT is a cut above the rest with superior NDT courses, knowledgeable instructors, and hands-on coursework to prepare all emerging technicians for NDT certification. Check us out online or give us a call today at 281-231-0001 to see how TXNDT can work for you!