A review on techniques for improving the mechanical properties of fusion welded joints

Abstract

This paper presents the effect of Post Weld Heat Treatment (PWHT), pulsed current welding, hybrid welding and vibratory assisted welding in the weld quality, residual stresses and mechanical properties of welded joints. At last, vibratory assisted welding has been suggested to enhance the mechanical properties of welded joints by overcoming the drawbacks in the above stated techniques. Past results showed that the welded test specimens under vibratory conditions exhibited improvements in mechanical properties than the arc welding without vibrations. Finally, some literature gaps are clearly identified and these gaps could help the future generation researchers to do work in the new direction.

Fatigue surface crack propagation and intersecting cracks in connection with welding residual stresses

“…Numerical simulation of 3-dimensional planar crack propagation can be constructed as a gradual process of crack increments (after finite number of cycles ΔN) in a limited set of the crack front points, the position of which is characterized by a dimensionless local coordinate s along the crack front from one external point to other points and has a range [0;1] ( Figure 1). In the calculation procedure, an infinitely small value dN is replaced by a finite cycle increment ΔN and the crack increment da is replaced by Δa in Equation (5). So the crack increment at the current crack front configuration (after N cycles) is calculated according to the following equation:…”

“…Welding technology, joining method, and the effect of process parameters on mechanical properties are very important to predict the fatigue life of welded structures. A review of the above‐mentioned aspects of welding can be found in previous studies …”

“…A review of the above-mentioned aspects of welding can be found in previous studies. [1][2][3][4][5][6] The welding process is accompanied by a change in the microstructure of the material and the appearance of residual stress. The residual stress as well as the microstructural change has a significant combined effect on fatigue crack propagation (eg, Fratini et al 7 ).…”

Influence of Mode of Power Source on the Mechanical Properties of Vibratory Weld Joints

“…The mechanical properties which are produced under the effect of excitations are validated with the finite element analysis. J. Kalpana et.al [5][6] introduced another new technique i.e., metal engravers to enhance the weld joint mechanical properties of the welded joints by. Here the dissimilar metals were considered for welding process.…”