Final answer:
The height of the weld above the base metal in a groove weld is known as weld reinforcement.
Step-by-step explanation:
The height of the weld above the base metal in a groove weld is called the weld reinforcement. Groove welds are often used to join two pieces of metal along a line to form a single, merged entity. The weld reinforcement is important because it directly relates to the weld's overall strength and quality. In terms of geometry, it is the extra material that extends above the surface of the base metal, providing additional cross-sectional area to bear the stresses that the joint may be subjected to in service. However, excessive weld reinforcement can lead to inefficiencies in cost and may affect the performance of the welded joint.