A double fillet weld is used to join the steel plates of 5 mm thick for a length of 20 mm. The allowable tensile stress for the weld metal is 100 MPa. The tensile strength of the joint is

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HPCL Engineer Mechanical 12 Aug 2021 Official Paper (Shift 1)

Answer 1

Concept:

Strength of Transverse Fillet Welded Joints

Tensile strength of the joint for single fillet weld:

\(P=0.707\times s\times l\times σ_t\)

Tensile strength of the joint for double fillet weld:

\(P=1.414\times s\times l\times σ_t\)

where l = Length of weld, s = Size of weld.

Calculation:

Given:

s = 5 mm, l = 20 mm, σ_t= 100 MPa

Tensile strength of the joint for double fillet weld:

\(P=1.414\times s\times l\times σ_t\)

\(P=1.414\times 5\times 20\times 100=14.14\;kN\)