A tube of outer diameter 150 mm is welded all round to a plate. Weld strength = 500 N/mm (LSM, IS 800-2017). The maximum torsional moment applicable so the weld will not fail, with partial load factor = 1.5, is

Weld torsional capacity T = 500 × 2π × 75² = 5.625π kN·mm = 5.625π kNm (official key).

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