What does non-destructive testing aim to achieve?

Non-destructive testing (NDT) aims to evaluate the properties and integrity of materials, components, or assemblies without causing any damage to them. This is crucial in fields like welding, where it's essential to ensure that welds meet safety and quality standards without compromising the material being tested. NDT methods, such as ultrasonic testing, radiographic testing, and magnetic particle testing, allow for the detection of flaws, defects, or discontinuities while preserving the weld's functionality and structural integrity.

The other choices do not align with the fundamental purpose of NDT. Altering the properties of the weld is contrary to NDT’s non-invasive nature, as NDT is intended to assess rather than modify. Making the weld stronger involves processes that change the material or add reinforcement, which is outside the scope of NDT. Accelerating the welding process pertains to the speed of welding itself and does not relate to testing methods aimed at ensuring quality and safety.