What is the shortest distance between the weld root and the face of the weld called?

The shortest distance between the weld root and the face of the weld is known as the actual throat. This dimension is crucial in welding as it directly influences the strength and integrity of the weld. The actual throat measurement is taken perpendicularly from the root of the joint to the face of the weld, and it represents the minimum effective cross-sectional area of the weld. Understanding this measurement is essential for ensuring that the weld can adequately bear the loads and stresses it will encounter in service.

The actual throat is particularly significant in welded joints like fillet welds, where this distance helps determine the weld's load-bearing capacity. Knowing how to measure and interpret the actual throat ensures that welds meet specified structural and safety requirements. This concept often comes into play in engineering calculations, weld inspections, and certifications.

In contrast, bevel angle refers to the angle formed by the edge of the workpiece and the surface it is joined to, which influences the joint preparation but does not define the distance from the weld root to the face. Joint root signifies the point where the base metals meet before the weld is applied and does not directly measure distance. Groove angle refers to the angle formed at the joint preparation which is relevant for shaping the weld bead but is not indicative of the