The active height (thickness) of a fillet weld is specified by the height of the biggest isosceles triangle inscribed into the weld section without penetration. The following image illustrates different weld designs.
The size of fillet weld height approximately specifies the = 0.7 formula, where z is the fillet weld width. Minimum fillet weld height is selected according to the thickness of the thicker welded part and according to the material. The following table presents the values of the recommended minimum fillet weld height.
|
Thickness of welded part [mm] |
Minimum thickness of fillet weld a [mm] for steels of the strength series |
||
|
over |
up to |
370 and 420 MPa |
520 MPa |
|
- |
10 |
3 |
4 |
|
10 |
20 |
4 |
5 |
|
20 |
30 |
6 |
7 |
|
30 |
50 |
7 |
9 |
|
50 |
- |
9 |
10 |