Which of the following is NOT a primary visual criterion for a sound brazed joint?

• A. Cracks or porosity present.
• B. Uniform fillet along the joint.
• C. Complete wetting, uniform fillet along the joint, and absence of cracks or porosity.
• D. Absence of flux residue.

Answer: (C)

Visual inspection of a brazed joint centers on how well the filler metal wets and fills the joint and whether any defects are present. A sound brazed joint should show complete wetting, a uniform fillet along the joint, and no cracks or porosity. The option that lists all three of these good signs together describes multiple positive indicators at once, which isn’t a single, standalone visual criterion. In practice, each criterion—complete wetting, uniform fillet, and absence of cracks or porosity—serves as part of the overall assessment, but as one statement it isn’t a single primary visual criterion. The other options point to defects (cracks or porosity), a single positive feature (uniform fillet), or a cleanliness detail (absence of flux residue) that is not by itself a definitive measure of joint soundness.