What is the significance of the "finish" in AWS D1.1 welds?

The significance of the "finish" in AWS D1.1 welds is primarily tied to aesthetic quality and paint adhesion. A well-finished weld provides a smooth surface that is visually appealing and helps ensure proper coatings, such as paint or galvanization, adhere correctly to the welded joint. This is particularly important in structures where appearance matters, or where environmental factors can lead to corrosion; a proper finish minimizes the risk of defects that could lead to future issues.

A rough or poorly finished weld surface can interfere with how paint and other protective coatings bond to the steel, potentially leading to premature failure of the coating. This can result in exposure of the weld and surrounding materials to the elements, increasing the risk of corrosion and structural integrity concerns.

While factors like weld thickness and strength are certainly important in structural welding, they are not the primary focus of the "finish" aspect in the context of AWS D1.1. The finish specifically addresses the quality and surface condition of the weld, which directly impacts both aesthetics and longevity through paint adhesion.