Which factor does NOT typically affect the results of CVN testing?

In the context of Charpy V-Notch (CVN) testing, the welding speed does not typically influence the results. CVN testing is primarily concerned with evaluating the toughness of materials, particularly under conditions that simulate field service. The factors that are relevant to CVN testing include the type of material being tested, the testing temperature, and the geometry of the notch itself.

The type of material is crucial because different materials have different inherent toughness characteristics. The testing temperature is also significant since toughness can vary with temperature; for example, materials may exhibit brittle behavior at low temperatures. Notch geometry is important as it affects the stress concentration in the material and, consequently, impacts how the material will behave when subjected to impact forces.

While welding speed may affect the microstructure and mechanical properties of welds, its influence on cvn test results is less direct and less critical compared to the other factors listed. In summary, welding speed does not have the same level of impact on toughness as the intrinsic properties of the material, the test conditions, or the specifics of the notch, which are fundamental to providing meaningful CVN test results.