Generally, in welded joints, the maximum size of fillet weld is considered by
Show Hint
Fillet weld sizing guide parameters:
- For square plate edges: \(s_{\max} = t_{\text{thinner}} - 1.5 \text{ mm}\)
- For round/rolled sections: \(s_{\max} = \frac{3}{4} \cdot t_{\text{section}}\)
This structural margin keeps the edge from melting completely, preserving the base metal geometry.
adding \(1.5 \text{ mm}\) to thickness of thinner member to be jointed
adding \(3 \text{ mm}\) to thickness of thinner member to be jointed
subtracting \(3 \text{ mm}\) from thickness of thinner member to be jointed
subtracting \(1.5 \text{ mm}\) from thickness of thinner member to be jointed
Show Solution
The Correct Option isD
Solution and Explanation
A fillet weld cannot be made as thick as the plate itself, because the outer edge of a thick plate does not fuse properly and the weld toe would burn or undercut the base metal if pushed to the full plate thickness. To avoid this, design codes cap the leg size of the weld a little below the thickness of the thinner of the two plates being joined. The usual rule of thumb used in practice is to take the thickness of the thinner member and subtract \(1.5\) mm from it to get the maximum permissible fillet weld size. So the maximum size is fixed by subtracting \(1.5\) mm from the thickness of the thinner member, option (4).