Final answer:
In a completed weld, the junction between the surface of a weld and the base metal is called the weld bead.
Step-by-step explanation:
In a completed weld, the junction between the surface of a weld and the base metal is called the weld bead. This is the area where the filler material fuses with the base metal to form a strong bond. The weld bead is usually slightly raised or convex compared to the surface of the base metal.