Describe a typical fillet brazed joint geometry.

• A. A rounded bead around the joint.
• B. A triangular brazed fillet at the joint with a smooth, continuous outer contour.
• C. A flat, planar joint with no fillet.
• D. A rectangular butt seam.

Answer: (B)

In brazing, the filler metal is drawn into the joint by capillary action and wets the surfaces, creating a bead that follows the intersection of the parts. The usual and desired shape is a triangular fillet along the joint, with a smooth, continuous outer contour that shows consistent wetting and a proper bond. This triangular fillet results from how the filler metal fills the gap and bonds to both surfaces. A rounded bead would not reflect the typical cross-section, a flat joint with no fillet indicates no brazing, and a rectangular butt seam isn’t the familiar fillet geometry.