Question

Which of the following is not true regarding effective throat thickness of weld?

(a) Effective throat thickness should not be less than 3mm

(b) It should not exceed 0.7t or 1t, where t is thickness of thinner plate of elements being welded

(c) Effective throat thickness = K x size of weld, where K is a constant

(d) Effective throat thickness = K x (size of weld)^2 , where K is a constant

The question was asked during an internship interview.

The origin of the question is Design Specifications in chapter Welded Connections of Design of Steel Structures

Answer 1

Correct choice is (d) Effective throat thickness = K x (size of weld)^2 , where K is a constant

For explanation: Effective throat thickness is the shortest distance from the root of fillet weld to face of diagrammatic weld(line joining the toes). The effective throat thickness should not be less than 3mm and it should not exceed 0.7t or 1t, where t is thickness of thinner plate of elements being welded. Effective throat thickness = K x size of weld, where K is a constant which depends on angle between fusion faces.