What is a "weld bead"?

A weld bead refers specifically to the deposited filler metal that forms the weld joint during the welding process. When two pieces of metal are joined together, the heat generated during welding melts the filler metal, which then cools down to create a solid joint. This solidified mass of filler metal is what constitutes the weld bead, and it is crucial for ensuring that the metals are securely bonded together.

The characteristics of a weld bead, including its appearance, shape, and size, can provide vital indicators of the quality of the weld. A well-formed bead will typically show good penetration into the base metals and a smooth surface. The composition and properties of the weld bead are also influenced by the type of filler material used and the welding process applied.

Understanding the formation and features of a weld bead is essential for welders to assess the integrity and strength of a weld, which makes the correct identification of this term critical in the welding trade.