What is the most extensively used NDE technique for welds?

Visual testing is the most extensively used non-destructive examination (NDE) technique for welds due to its simplicity, effectiveness, and immediate results. This method does not require specialized equipment or extensive training, making it accessible for routine inspections. It involves the direct observation of welds to identify surface defects, such as cracks, undercuts, porosity, and inadequate weld size.

In many cases, visual testing is performed as a preliminary examination before applying more specialized NDE methods. Welders and inspectors can use visual testing to ensure that welds meet specified standards and to determine if further investigation with other techniques is necessary. Moreover, visual inspection can be rapidly conducted, allowing for quick decision-making and reinforcing its prevalent use in various sectors, particularly in construction and manufacturing.

The contrast with other NDE methods lies in their complexity, required training, and specific applications. Techniques like radiographic testing, magnetic particle testing, and ultrasonic testing offer detailed insights into internal and surface defects but come with more stringent guidelines and safety considerations.