Minimum thickness of a fillet weld is

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  1. 5 mm
  2. 3 mm
  3. 2 mm
  4. 4 mm

Answer (Detailed Solution Below)

Option 2 : 3 mm
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Explanation

As per IS 800: 2007, Table 21, the minimum size of a fillet weld is based on the thickness of the thicker plate which is given below in the

tabulated form:

Thickness of thicker Part

Minimum size of the weld (mm)

≤ 10 mm

3

10 to 20 mm

5

20 to 32

6

32 to 50 mm

8

 

Further, it is also specified in the code that when the minimum size of the fillet weld given in the table is greater than the thickness of the thinner part, the minimum size of the weld should be equal to the thickness of the thinner.

Therefore, it is clear from above that size of the fillet weld should not be less than 3mm or not more than the thickness of the thinner part.

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