What is the minimum fillet weld size for a small 5/8" stud?

The minimum fillet weld size for a small 5/8" stud is determined by the guidelines set forth in AWS D1.1. When considering the attachment of a stud, the minimum size fillet weld recommended is based on the diameter of the stud. According to the code, the fillet weld size should typically be at least one-half of the stud diameter. In this case, for a stud of 5/8" (0.625 inches), one-half of that would yield a minimum required fillet weld size of 5/16" (0.3125 inches).

This size ensures that the weld is sufficient to handle the loads and stresses that the joint will encounter during its service life. Using a smaller weld could compromise the integrity of the connection, while opting for a larger weld is acceptable but not required for meeting the minimum standards. Therefore, the choice of 5/16" accurately reflects the minimum requirements as outlined in the AWS D1.1 code.