What type of weld is created through a hole in one piece of metal to attach it to another piece?

The type of weld created through a hole in one piece of metal to attach it to another piece is known as a plug weld. This process typically involves creating a circular hole in the top piece of metal, allowing the underlying piece to be welded through the hole. The plug weld effectively joins the two pieces together, providing a robust connection that is typically used when the aesthetic of the top surface is important, as it leaves a relatively clean appearance.

In contrast, other types of welds serve different purposes. For instance, a fillet weld is used to join two surfaces at an angle and is commonly applied in joints such as corner or edge connections but does not involve a hole. A slot weld, while also involving a hole, typically refers to a long, narrow opening rather than a circular one and is not primarily focused on attachment like a plug weld. A weld bead refers to a general term for the deposit of molten filler material created during the welding process and does not represent a specific type of connection. Understanding these distinctions will help you recognize various welding applications and their functions.