Visual Testing (VT)
Description
Visual testing (VT), also called visual inspection, is a nondestructive testing (NDT) method that visually examines a component to assess the need for maintenance.
Application
Visual examiners follow procedures ranging from simply looking at a part to detect surface imperfections to using computer-controlled camera systems to recognize and measure component features automatically.
It's the most common NDT method used across industries and can be used at any stage of a component's lifecycle. VT is often the first step in examining products like castings, forgings, machined components, and weld elements.
step by step Process
- Lighting: Ensure adequate lighting to detect defects accurately.
- Preparation: Clean the surface to remove dirt, rust, or coatings that may obscure defects.
- Inspection: Conduct a direct visual inspection using the naked eye or tools like magnifying glasses, borescopes, or cameras for hard-to-reach areas. All interpretations and discontinuities found are evaluated, sized, and compared to the applicable code, standard or customer specifications to determine if they meet the requirements to be deemed acceptable or rejectable.
- Documentation: Record observations, measurements, and findings using photos or written reports.