What is the minimum size of a "First Run" or a "Single Run Fillet Weld", when the thickness of the thicker plate is 8-10 mm and the thickness of the thinner plate is 5–6 mm.
- A2.0 mm
- B2.4 mm
- C3.0 mmCorrect
- D4.0 mm
Solution
Concept
Minimum fillet weld size (IS 800 Table 21)
Step-by-step solution
1. IS 800 Table 21: thicker part up to 10 mm → minimum size 3 mm. 2. Thicker part 10–20 mm → 5 mm. 3. Here the thicker part is 8–10 mm, so 3 mm.
Explanation
Minimum size depends on the thicker plate thickness.
Why the other options are wrong
2.0, 2.4 and 4.0 mm are not in the table for this range.
Shortcut
Thicker ≤ 10 mm → 3 mm.
Correct answer: C) 3.0 mm