Welding Tips and Tricks

When producing a fillet weld, what is the limit on how concave the face of a fillet weld can be? Is the limit to the point, as long as, the face of the weld does not dip below the weld's theoretical throat?

Also, what steps can be used determine where the theoretical throat would be after a fillet weld is made?

They make a small metal template you hold up to the weld like a go no go gauge.
http://www.amazon.com/Anchor-Brand-Weld ... B001391PA6

It all depends on what standard you are welding to. Household furniture will have a easier requirement than structural steel.

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Agreed min will / should be on a print or specked by engineers. If it's not I was taught that the thickness if the center of the fillet weld and the width should exceede the thickness to the thinnest metal your joining. But rules of thumb are just an opinion.

A fillet weld is measured by the largest inscribed isosceles right triangle. On a fillet with a flat or slightly convex face it will be the smaller of the two leg sizes. On a fillet with a concave face you need to measure the throat. The gauges Poland has linked to are pretty decent for doing that. As far as how concave a fillet can be, leg size should be specified on a weld symbol or a general note on the print. The leg size on a concave fillet beyond the largest inscribed isosceles right provides little if any strength.

John