Which of the following is NOT a property commonly involved in welding procedures?

Electrical conductivity is not typically considered a primary property involved in welding procedures. Welding processes focus on various characteristics that directly impact the quality and integrity of the weld, such as weld appearance, weld strength, and weld shrinkage.

Weld appearance refers to the visual quality of the weld, which can indicate the cleanliness and overall quality of the welding operation. Weld strength is crucial as it determines the weld's ability to withstand loads and stresses in service. Weld shrinkage, on the other hand, relates to the changes in dimensions that occur as the welded material cools, which can affect the fit-up and alignment of components.

While the electrical conductivity of materials being welded can influence aspects of the welding electrical characteristics and the choice of welding parameters, it is not a commonly referenced property in the assessment of weld quality or procedure qualifications. Therefore, it stands apart from the other properties listed that are more directly involved in determining successful welding outcomes.