What is a "weld pool" in the context of MIG welding?

In the context of MIG welding, a weld pool refers to the molten metal that forms during the welding process. When the welding wire is fed into the arc, it melts due to the intense heat generated by the arc between the welding wire and the workpiece. This molten metal gathers in a pool and is crucial for creating a strong, consistent weld as it solidifies and joins the base metals together.

The characteristics of the weld pool, such as its temperature, size, and shape, can significantly impact the quality of the weld. Proper control over the weld pool ensures good fusion between the parts being welded and helps prevent defects like porosity, undercut, or incomplete penetration. Understanding the behavior of the weld pool is essential for any welder aiming to produce high-quality welds.