What does AWS D1.1 require concerning filler metals?

The requirement for the selection of filler metals compatible with base materials is crucial in the context of the AWS D1.1 Structural Welding Code. This standard ensures the integrity and performance of welded joints. The compatibility of filler metals with the base materials affects mechanical properties, corrosion resistance, and the overall quality of the weld. Using a filler metal that is not compatible with the base material can lead to issues such as cracking, reduced strength, and premature failure of welded structures.

The code emphasizes that filler metals should correspond to the same nominal composition as the base metals for effective bonding. Proper selection also aligns with the anticipated service conditions of the structure, ensuring optimal performance under the stresses and environmental conditions that the welded assembly will face. This requirement reinforces the importance of understanding the chemical composition and properties of both the filler and base materials to achieve sound welds.

This comprehensive approach is instrumental in maintaining safety and reliability in structural steel constructions, making the compatibility of filler metals with base materials a fundamental aspect of the AWS D1.1 guidelines.