What is the groove angle for joint B-U5b with spacer?

The groove angle for joint B-U5b with a spacer is indeed 25 degrees. This specification is in accordance with the AWS D1.1 Structural Welding Code, which outlines various joint configurations and their respective requirements for welding.

In the case of the B-U5b joint type, which is typically a butt joint with a backing bar or spacer, the design aims to facilitate proper penetration and fusion of the weld metal. The designated groove angle of 25 degrees optimally balances the requirements for effective welding while ensuring that the necessary joint geometry is maintained to support the structural integrity of the welded assembly.

Providing a specific angle such as this is essential for achieving adequate weld quality and strength, as it influences the weld pool shape and the ease of accessibility for the welder, particularly in joints that can be more challenging due to their configuration. Therefore, adhering to the specified groove angle is critical in ensuring compliance with the code and ensuring robust weld performance.