What is the assumed size of a fillet weld if no size is specified?

In welding as per industry standards, if the size of a fillet weld is not specified on a drawing or print, it is generally assumed to be 1/4 inch. However, in certain contexts such as with specifications related to structural steel or shop drawings, the value can indeed vary, which sometimes leads to the misunderstanding that it could also be larger, such as 1/2 inch or 3/8 inch.

Given this context, it's essential to refer to industry standards and specifications that dictate the assumed sizes of welds when not explicitly detailed. Common welding specifications like the American Welding Society (AWS) might use a default size in their guidelines or practices. It's important for welders and designers to be aware of these conventions as they can significantly influence the overall strength and integrity of the welded joint in a structure.

In summary, while it's easy to get confused due to varying practices, the standard assumption in many foundational guidelines is that the default size for a fillet weld is indeed 1/4 inch, thus clarifying any ambiguities around what might have been interpreted without clear direction on the print.