Fig. 4 — The 1⁄2-in. gauge used to verify the throat is properly sized for a 1⁄2-in. fillet weld. Inspection Trends / Winter 2011 15 easy, but things get a little more complicated when dealing with fillet welds that are convex, concave, or a combination of both. The fillet weld gauge can be used for both convex and concave fillet welds. The first step is to determine the profile of the fillet weld face. The inspector can do that by lightly rubbing an index finger along the face of the weld. The tactile feel of the fingertip should be able to determine whether the weld face bulges out and is convex or the face of the weld sinks in and is concave. This is done so the inspector knows which end of the gauge to use. As you can see from Fig. 3, the left end of the gauge is used to size the leg dimension of a weld. As shown in Fig. 4, the right end of the gauge is used to size the throat of fillet welds. Fig. 3 — A 1⁄2-in. gauge is used to verify the leg size of a 1⁄2-in. fillet weld. Fig. 5 — Verifying the horizontal leg meets the size requirement. Fig. 6 — Undersized convex fillet weld. The vertical leg is too small. Fig. 7 — Fillet weld gauge sizing a concave fillet weld that has insufficient throat to meet the size requirements of a fillet weld with 1⁄2-in. legs. Fig. 8 — Convex fillet weld size is the same as the fillet weld gauge.
Inspection Trends - January 2011 - Winter
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