To read this content please select one of the options below:

Effect of defects on the strength of welds

Morgan Dundu (Department of Civil Engineering Science, University of Johannesburg, Johannesburg, South Africa)

Journal of Engineering, Design and Technology

ISSN: 1726-0531

Article publication date: 30 September 2014

430

Abstract

Purpose

The purpose of this paper is an experimental investigation to determine the effects of defects on the strength of welds.

Design/methodology/approach

This investigation was carried out using butt- and fillet-welded specimens in tension. Several welding skills were incorporated into the investigation so as to come up with different types of defects. Half of the samples were welded flat and the other half, vertical.

Findings

Vertical welding resulted in a greater percentage of defects than flat welding. Most of the defects in the welds were a result of incomplete penetration, lack of fusion, slag inclusion, porosity and failure to weld to the given dimensions. The tests show that there is a linear relationship between the area of defects and the ultimate capacity of the joints.

Originality/value

Although the purpose of this research was to determine the effect of defects on the strengths of both butt and fillet welds, more attention was focused on fillet welds, as this investigation had not been carried out before. Fillet welds experience shear only, unlike butt welds which can either be in tension or shear, or, in rare cases, a combination of the two.

Keywords

Acknowledgements

The author wishes to thank the Southern Africa Institute of Steel Construction (S.A.I.S.C) for sponsoring the research work reported in this paper and the South Africa Institute of Welding (S.A.I.W) for making the specimens.

Citation

Dundu, M. (2014), "Effect of defects on the strength of welds", Journal of Engineering, Design and Technology, Vol. 12 No. 4, pp. 410-422. https://doi.org/10.1108/JEDT-02-2012-0008

Publisher

:

Emerald Group Publishing Limited

Copyright © 2014, Emerald Group Publishing Limited

Related articles