Slide the gage and have the top end rest against the vertical piece. The illustrations above show you how to test a 1/2″ fillet. This gage will let you know if your weld is concave.Įxample of properly sized 1/2″ fillet weld We always want our welds to be flat to slightly convex. This Fillet Weld Gage is on of the easiest to use and it is helpful to check for fillet size and concavity. Below are instructions and graphics on how to use both. The two most used and certainly our favorites are the Standard Fillet Weld Gage and the AWS Gage (Automatic Weld Size Gage). There are several kinds of gages used in measuring welds and weld defects such as porosity, undercut, underfill, concavity, etc. We also know that other than CWIs most people that owned these gages use them improperly. In our experience 98% of fillet gages are owned by CWIs and other inspectors, yet welders, supervisors and production managers should all be using them, as they are always conducting welding inspection. states that “other than the measuring tape, the fillet weld gage is the most used measuring device in the welding inspector’s kit.” We agree with this statement, but are also convinced that the fillet weld gage is THE most underused tool by people responsible for quality and welding operations. In the January 2011 AWS publication of Inspection Trends, Albert J.
