A physical attribute that cannot be visually inspected during welding is:

• A. The welding process
• B. The acceptability of the weld, with regard to its appearance
• C. Alignment and fit-up
• D. Joint preparation

Answer: (B)

During welding, you can observe tangible things in real time: what welding process is being used, how the parts are aligned and fit together, and how the joint has been prepared. These are physical attributes you can verify visually as you work. The thing that cannot be determined by a simple visual glance during the welding itself is whether the weld will be acceptable based on its appearance. That is a post-process judgment, tied to finish quality and standards, and it requires inspecting the completed weld (and often nondestructive testing) to confirm it meets the required appearance criteria. So the appearance-based acceptability is not something you can reliably judge just by looking during welding, making it the best choice.