What is the allowable gap for tight fit of intermediate stiffeners?

The allowable gap for a tight fit of intermediate stiffeners as specified in the AWS D1.1 Structural Welding Code – Steel is indeed 1/16 inch. This is important in welding practice because maintaining a proper fit-up between stiffeners and the main member is crucial for achieving the desired structural integrity and load transfer.

A gap of this size allows for the effective penetration of weld metal into the joint without creating excessive stress concentrations or defects. A gap that is too large can lead to issues such as incomplete fusion, porosity, or lack of penetration in the weld, which could compromise the strength of the connection. In contrast, a smaller gap like 1/32 inch may not allow sufficient room for the weld material and can make it difficult to achieve a proper weld, while a larger gap of 1/8 inch or 1/4 inch might contribute to similar problems as mentioned earlier, negating the advantages of a tight fit.

Adhering to the specification of a 1/16 inch gap for intermediate stiffeners is a critical aspect of ensuring the quality and reliability of welded structures, aligning with design best practices outlined in the code.