[22] analyzed the effect of process variables on the weld geometry by using the Taguchi method and concluded that the use of the Taguchi method greatly optimized the TIG welding of stainless steel by improving its quality characteristics. [PERSON] et al. [23] analyzed TIG-welded duplex stainless steel in a single pass, without using the filler metal and grooves. The weld geometries were studied by changing the process parameters, i.e., current and speed. The geometry was carefully evaluated using an optical and scanning electron microscope. [PERSON] et al. [24] deliberated the influence of sample thickness and mean stress on the fatigue life of an Al-Mg-Si alloy butt joined using TIG welding and vacuum brazing. Fatigue loading tests with constant and variable amplitude were performed. [PERSON] et al. [25] studied the influence of process variables applied in the tungsten inert gas welding of a nickel-base alloy on microstructure, tensile strength, and failure. The results showed that when the current was increased and the welding speed was slowed down, the heat input went up. [PERSON] et al. [26] noticed the effect of residual stress and crack closure on crack retardation during overload. They found that the crack closure effect was greater at low baseline load ratios but for a longer time, while the residual stress effect was for a short time but present at all values of baseline load ratios. [PERSON] et al. [27] found the effects of different parameters, i.e., single and block overloads, and random spectrum loading, on the crack growth. Then, a single tensile overload effect on fatigue crack growth in dual-phase steel was analyzed by [PERSON] et al. [28]. It was also studied by [PERSON] et al. [29], for an aluminum alloy under biaxial fatigue loading. [PERSON] and [PERSON] [30] discussed the finite element method and the extended finite element method for fatigue crack propagation modelling with recent developments. [PERSON] et al. [31] carried out experimentation on the AA7075-T651 alloy to analyze the fatigue growth behavior under proportional and non-proportional mixed mode I and mode II loads for cyclic tension and torsion. They found that AA7075-T651 was capable of producing non-planar shear mode fatigue crack growth that was long and stable for non-proportional mixed mode I and mode II loads. Afterwards, [PERSON] and [PERSON] [32] incorporated a mesh independent computational algorithm, using Abaqus for automated fatigue crack growth analysis, with various conditions, including mixed-mode variable amplitude loading. The results were compared with those of the experimental data. [PERSON] and [PERSON] [33] computed the stress intensity factor for geometry under tension and torsion using the finite element method and found a solution for a variety of crack lengths. They also devised a method for modeling growth delays in crack propagation due to stop-hole-induced fatigue cracks under mixed-mode conditions [34]. Furthermore, [PERSON] et al. [35] derived a new approach to finding the fatigue crack in ductile material with both mixed-mode loading and overloading. They compared two different methods to measure cohesive traction, i.e., the cohesive zone model and the interfacial thick level set method. It was deduced that both methods were in accordance with the mode I analytical relation and a mixed-mode experiment. Researchers, for instance, [PERSON] et al. [36], have conducted quite similar work but with oxy-acetylene-welded aluminum alloys joints and discussed the effect of welding on the fatigue strength of the base material. [PERSON] et al. [37] did fatigue testing on longitudinal welded joints. [PERSON] et al. [38] studied stress-strain behavior in creep-fatigue and tensile testing on a 9 Cr/CrMoV weld joint and compared them with base metals. They deduced that the actual strain amplitude is four-times, while the hysteresis energy density is ten-times that of the base metal. Similarly, [PERSON] et al. [39] compared mechanical characteristics of aluminum alloy 5086 and its welded joint.