What is the term for the minimum distance between the weld root and weld face?

The term for the minimum distance between the weld root and the weld face is referred to as the effective throat. This measurement is important in welding because it helps determine the strength and integrity of the weld. The effective throat is the shortest distance from the root of the weld (the deepest part of the joint where the weld metal starts) to the face of the weld (the exposed surface of the weld). Understanding this measurement aids in ensuring that the weld meets strength requirements and adheres to design specifications.

In contrast, weld penetration refers to how deep the weld metal extends into the base metal, which is a different aspect of joint strength. Weld length is simply the total length of the weld bead applied, while root opening pertains to the gap between the edges of the base material before welding occurs. These definitions highlight distinct aspects of welding joints and their structural characteristics, making effective throat the most relevant term for the question asked.