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As per ‘Indian Standard General Construction in Steel- Code of practice’ for deep penetration welds, where the depth of penetration beyond the root run is a minimum of 2.4 mm, the size of fillet should be as:

As per ‘Indian Standard General Construction in Steel- Code of practice’ for deep penetration welds, where the depth of penetration beyond the root run is a minimum of 2.4 mm, the size of fillet should be as: Correct Answer Minimum leg size + 2.4 mm.

Explanation:

As per IS 800: 2007 -

  1. The size of normal fillets shall be taken as the minimum weld leg size.
  2.  For deep penetration welds, where the depth of penetration beyond the root run is a minimum of 2.4 mm, the size of the fillet should be taken as the minimum leg size plus 2.4 mm.
  3. For fillet welds made by semi-automatic or automatic processes, where the depth of penetration is considerably in excess of 2.4 mm, the size shall be taken considering the actual depth of penetration.
  4. The size of fillet welds shall not be less than 3 mm.\
  5. The minimum size of the weld is based on the  thickness of the thicker plate being connected as shown in the below-tabulated form:

Thickness of thicker plate connected (mm)

≤ 10 mm

11-20 mm

21-32 mm

> 32 mm

Minimum size of the weld (mm)

3 mm

5 mm

6 mm

8 mm

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