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The term that refers to the surface of a groove weld on the side from which welding is performed is known as the weld face. This is the surface that is visible after the welding process, and it is critical for determining the quality and integrity of the weld. The weld face must be carefully examined for defects, consistency, and adherence to specifications to ensure that the weld meets all required strength and safety standards.

Understanding the weld face is important in welding practices because it plays a key role in evaluating the effectiveness of the weld and ensuring that it will perform well under the various stresses that it may encounter in service. Proper preparation and execution of the weld face can help reduce the likelihood of issues such as cracking or incomplete fusion, which can compromise the overall joint strength.

In regard to the other terms, the weld root represents the deepest part of the weld joint, typically the inside or bottom side of the groove, while the weld leg refers to the lengths of the weld on either side of the joint. The weld throat is associated with the measure of the effective thickness of the weld. Each of these terms describes different aspects of the weld, but the specific focus on the surface from which the welding is performed directs us to the concept of the weld face.