This is a straight run down on how to use a welding fillet gauge. Many other manuals do not do justice in explaining how to use a welding fillet gauge properly. Luckily, ALLY Tools and Parts made their own manual to streamline the understanding on how to use a fillet welding gauge.
First thing first, the two types of measurement that you do with a Fillet Welding Gauge is checking throat thickness and checking leg length.
Checking Throat Thickness
With your weld in hand, grab one of the fillet welding gauges to measure the throat thickness according to your specified thickness needed. Check if the protrusion in the middle of the gauge makes contact with your weld. If there is space between the weld and the protusion, you need to fix your weld. If there is no space, then that means you did a good job.
A good pointer to know is that a weld should never be concave.
Checking Leg Length
The next type of measurement that a Welding Fillet Gauge does is checking leg length. To do this, grab the fillet weld gauge that meets your weld specifications. Slide the gauge so its rests against the vertical metal piece of your weld. If you notice there is space between the Horizontal Toe a.k.a "H. Toe" and the weld, then your weld is undersize horizontally and must be fixed.
If you notice that the weld does not extend all the way to the Vertical Toe a.k.a "V. Toe" then your weld is undersized vertically and must be fixed.
If you ever lose your copy of our welding fillet gauge manual, you can redownload a copy here!