What is the primary focus of the weld cleaning requirement established in D1.1?

The primary focus of the weld cleaning requirement established in D1.1 is to ensure structural integrity. This is critical because the presence of contaminants, such as rust, oil, or dirt on the surfaces to be welded, can adversely affect the quality of the weld. If these impurities are not properly cleaned, they can lead to defects like porosity, poor fusion, and cracking, which compromise the strength and durability of the welded joint. Ensuring that the base material and the weld area are clean allows for proper melting and bonding of the metals, which is essential for maintaining the integrity and reliability of the structure being welded.

While aesthetics, safety regulations, and cost reduction are important considerations in welding, the primary objective of weld cleaning requirements in the context of D1.1 is fundamentally about maintaining the strength and reliability of the welded connection.