In general, cause and development stages of any damage or failure process of welded structures are complex.
Various factors may interact at different stages of any damage occurrence. Use of advanced modelling tools
and fitness-for-service procedures at the design stages of complex welded structures could ensure structural
integrity and safe operation while contributing to the economic fabrication and inspection scheme.
Development of Structural Health Monitoring (SHM) systems for welded structures is still a challenge for
the designers and plant operators. Furthermore, use of wireless, remote sensors with sufficient reliability
to monitor large and complex structures to prevent development of a critical situation at any part of the
structure require further research. This offers new opportunities and challenges for structural and other
engineering disciplines.
15
Through Optimum Use and Innovation of Welding and Joining Technologies
Improving Global Quality of Life
3
Significance of welding and joining
Figure 3.4
Schematic showing the significance of yield strength mismatch on deformation
and fracture behaviour under static loading (Reproduced courtesy of: GKSS, M. Kocak)
Homogeneous
Structure
Plastic Zone
Remote Plasticity
at the Base Metal
Confined Plasticity
within Weld Zone
Strength
Over-Matched
Welded Structure
Strength
Under-Matched
Welded Structure
