What is the required root opening for a B-L2c-S weld to be made in a flat position with a 60° groove angle?

In the context of welding and the AWS D1.1 Structural Welding Code, the root opening refers to the space between the edges of the joint before it is welded. For a B-L2c-S weld specifically made in a flat position with a 60° groove angle, the allowed root opening is dictated by the groove specifications outlined in the code.

Selecting a root opening of 0 inches signifies that the weld is intended to be made without any gap between the pieces being joined at the root. This is common in many groove weld applications where a tight fit is essential for optimal weld quality and strength. A zero root opening allows for better fusion and penetration of the weld metal, ensuring that there are no voids or weaknesses at the critical joint interface.

Other suggested root openings, such as 1/8 inch, 1/4 inch, or 3/16 inch, can be appropriate in certain situations or for different types of welds and positions, but for this specific scenario regarding the B-L2c-S weld with a 60° groove angle in a flat position, the standard calls for no root opening. Therefore, a root opening of 0 inch is the correct choice.