What radius shall be applied to the top and bottom of both base faces during the finish grind?

The application of a radius during the finish grind is crucial to ensure proper joint geometry and to reduce stress concentrations in the weld area. A radius of 1/16 inch on the top and bottom of both base faces is typically specified to provide a smooth transition and to enhance the structural integrity of the welded joint.

This radius helps in minimizing the potential for crack initiation and propagation, which can occur at sharp corners. The defined radius also assists in improving the flow of molten metal during the welding process and contributes to achieving better fusion between the base materials and the weld metal.

Using a radius of 1/16 inch strikes an appropriate balance, as it is small enough to maintain the necessary profile while still offering the benefits of reducing sharp edges. This minor rounding is critical in practice to meet the requirements of various welding codes and standards, ensuring the reliability and strength of the finished weld.