Identifying the right non-destructive testing (NDT) method is an important part of ensuring quality, safety, and compliance for industries ranging from aerospace to construction. But with multiple inspection options available, how do you know which one is right for your specific application?
Two of the most common non-destructive inspection methods are radiographic testing and ultrasonic testing. While both methods are used to perform volumetric inspections without damaging the material being tested, each technique works differently and delivers distinct advantages.
What Is Radiographic Testing?
Radiographic testing (RT), or radiographic inspection, is a non-destructive testing method that uses X-rays to perform a volumetric assessment of raw materials. This enables inspectors to visualize what’s happening inside the material and identify internal defects such as porosity, voids, or inclusions without damaging the part.
At American Testing Services, our advanced computerized radiography non-destructive testing services offer significant advantages over traditional film radiography, including:
- High-resolution digital images
- Fast turnaround – no time spent on film and chemical processing
- Improved reliability and repeatability
The digital images can be easily shared and archived for future reference and compliance documentation requirements.
What Is Ultrasonic Testing?
Ultrasonic testing (UT) is a non-destructive testing method that uses high-frequency sound waves to detect internal imperfections and changes in material properties.
During an ultrasonic inspection, sound waves travel through the material and reflect a signal back to identify and measure internal flaws or material thickness. While both radiographic and ultrasonic testing provide a volumetric assessment, ultrasonic testing can also provide the depth of the defect.
At American Testing Services, we offer 100% full volumetric inspection using our automated 6-axis immersion ultrasonic systems. Ultrasonic testing produces accurate real-time measurement data and, in most cases, requires access to only one side of the material being tested.
Advantages of Radiographic Testing
- Provides an image of the inside of a part or material
- Creates a permanent digital record for compliance and quality assurance
- Best for identifying volumetric defects such as porosity, voids, and inclusions
Advantages of Ultrasonic Testing
- Real-time inspection results
- No radiation hazards
- Ideal if access to material or part is limited to only one side
- Best for detecting cracks, voids, delaminations, and other internal defects
Which Non-Destructive Inspection Method Is Best?
Factors such as material type, size and shape, defect type, accessibility, and industry standards all play a role in determining the appropriate non-destructive testing method.
For certain cases, using both radiographic and ultrasonic testing provides the most comprehensive picture of the material’s soundness without damaging its structural integrity.
Eliminate the Guesswork with American Testing Services
Selecting the best inspection method for your application is just as important as performing the inspection itself.
At American Testing Services, our certified technicians take the time to understand your application and recommend the non-destructive testing method that will deliver the most accurate and reliable results.
Whether you need radiographic testing, ultrasonic testing, or another non-destructive testing service, we’ll help you make an informed decision that supports quality, safety, and compliance. We also offer metallurgical testing services, which may be used in tandem with NDT to provide comprehensive insight into a material’s soundness and integrity.
Ready to schedule non-destructive testing? Contact American Testing Services today. Our experienced team will guide you to the right testing solution for your application and deliver results you can count on.