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Which of the following are not the assumptions made in the analysis of welded joints?

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Which of the following are not the assumptions made in the analysis of welded joints?

(a) welds connecting various joints are homogenous, isotropic

(b) parts connected by weld are rigid

(c) only stresses due to internal forces are considered

(d) effects of residual stresses are neglected

I got this question in an internship interview.

This intriguing question originated from Design Specifications in division Welded Connections of Design of Steel Structures

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Correct answer is (c) only stresses due to internal forces are considered

To explain I would say: The following are the assumptions made in analysis of welded joints: (i) welds connecting various joints are homogenous, isotropic and elastic elements, (ii) parts connected by weld are rigid and their deformations are neglected, (iii) only stresses due to external forces are considered. Effects of residual stresses, stress concentration and shape of welds are neglected.

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