Numerical - Weld throat thickness for parallel fillet, given allowable shear stress & tensile load

Q.  Calculate weld throat thickness for the parallel fillet weld shown below, if allowable shear stress is 80 MPa and tensile load of 300 kN is acting on it.
- Published on 14 Sep 15
Parallel-Fillet-Weld.png


a. 2.6 mm
b. 9.56 mm
c. 9.86 mm
d. 8.36 mm

ANSWER: 9.86 mm

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    Discussion

  • Sravanthi   -Posted on 06 Nov 15
    Shear stress: The component of stress which is coplanar with the material cross section is called as shear stress. It is the force tending to cause deformation of material along the plane which is parallel to the imposed stress.

    Given: allowable shear stress = 80 MPa, tensile load = 300 kN, l1 = 140 mm, l2 = 100 mm, l3 = 140

    Formula: τ = P / (l1 + l2 + l3 ) t

    here, P = tensile load, l1 = l2 = l3 are the length of welds,


    Solution:

    Substituting the given values we get,

    Shear stress τ = P / (l1 + l2 + l3 ) t

    80 = 300 x 103 / ( 140 +100 + 140) x t

    t = 9.868 mm

    Weld throat thickness for the parallel fillet weld is 9.868 mm

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