What is the point where the weld face meets the base metal called?

The point where the weld face meets the base metal is known as the weld toe. This term specifically refers to the transition area at the edge of the weld where the weld metal starts to blend into the base material. Understanding the location of the weld toe is essential for assessing the integrity and quality of a weld since it is one of the critical areas where potential defects can occur, such as cracks or undercutting.

Other terms like weld edge and weld seam refer to different aspects of the welding process. The weld edge commonly describes the outline or boundary of the weld bead itself, while the weld seam usually pertains to the entire length of fusion between two pieces being welded, encompassing both the weld face and the base metal areas. Weld tip is not a standard term used in welding terminology, further differentiating the validity of weld toe as the correct answer.