How does AWS D1.1 address the issue of joint design?

The correct choice highlights that AWS D1.1 emphasizes the importance of minimizing stress concentration through well-thought-out joint designs. The code provides specific guidelines and recommendations that influence the geometry and arrangement of welded joints, which are crucial for ensuring the integrity and performance of the welded structures.

By promoting designs that minimize stress concentrations, AWS D1.1 helps to enhance the durability and safety of welds in structures subjected to various loads. Effective joint design contributes to a uniform distribution of stresses and reduces the risk of fatigue failures, which is particularly important in structural applications.

The other options do not accurately reflect the approach taken by AWS D1.1. The code does not advocate for random designs; rather, it provides systematic guidance. It also does not discourage designed joints; on the contrary, it encourages thoughtful design. Additionally, while specific joint designs may be matched to certain materials, the guidelines of AWS D1.1 are broader and do not limit joint design specifications exclusively to a few materials. This comprehensive approach ensures that the welding practices align with safety and engineering standards across various applications.