A new approach to study the influence of the weld bead morphology on the fatigue behaviour of Ti–6Al–4V laser beam-welded butt joints

Boccarusso, Luca; Arleo, Giuseppe; Astarita, Antonello; Bernardo, Franco; Fazio, Piero De; Durante, Massimo; Minutolo, F. Memola Capece; Sepe, Raffaele; Squillace, Antonino

doi:10.1007/s00170-016-8764-4

Cited by 27 publications

(9 citation statements)

References 23 publications

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“…These studies support the fact that the electric current plays a dominant role in the bead size because the electrode wire is melted by electrical resistance heat [26,27]. Boccarusso et al [28] studied the relationship between bead morphology and fatigue life with various welding process parameters. They concluded that the heat input changes the bead aspect ratio between the maximum height and width of the joint, which influences fatigue life.…”

Section: Introductionmentioning

confidence: 72%

Prediction and Characteristics of Angular Distortion in Multi-Layer Butt Welding

Seong

2019

Materials

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Multi-layer welding involves the process of stacking many beads, so it requires much time and effort to predict the deformation through experimentation or numerical analysis. In this study, a systematic method for predicting transverse angular distortion in multi-layer butt welding has been proposed. First, the database was established through bead-on-plate welding experiments, which consisted of the relationship between welding conditions, the bead geometry, the material thickness, and the angular distortion. Then, when the arbitrary welding conditions and the shape of the butt joint were input, the method calculated the angular distortion per pass using the geometric principle and the database. The obtained prediction curves were verified with the V-groove welding experimental results. In addition, the characteristics of angular distortion in multi-layer butt welding were discussed. It was found that the angular distortion curve is a function of the number of passes and groove geometry. This algorithm is based on a numerical approach that saves computational time using databases and geometry, so it is suitable for industrial applications.

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Section: Introductionmentioning

confidence: 72%

Prediction and Characteristics of Angular Distortion in Multi-Layer Butt Welding

Seong

2019

Materials

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“…Laser welding is an attractive option because laser is stable and repeatable. In this experiment, austenitic stainless steel AISI 316L (EN 1.4404) was used, as it is a commonly used austenitic stainless steel within marine, energy, aerospace, and medical environments due to its excellent strength and corrosion resistance performances [29,30].…”

Section: Methodsmentioning

confidence: 99%

Cause of Angular Distortion in Fusion Welding: Asymmetric Cross-Sectional Profile along Thickness

et al. 2018

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Angular distortion is a common problem in fusion welding, especially when it comes to thick plates. Despite the fact that various processes and influencing factors have been discussed, the cause of the angular distortion has not been clearly revealed. In this research, the asymmetry of cross-sectional profile along thickness is considered of great importance to the angular distortion. A theoretical model concerning the melting-solidification process in fusion welding was established. An expression of the angular distortion was formulated and then validated by experiments of laser welding 316L stainless steel. The results show that the asymmetric cross-sectional profile is a major contributory factor towards the angular distortion mechanism. The asymmetry of cross-section profile along thickness causes the difference between two bending moments in the lower and upper parts of the joint. This is the difference that drives the angular distortion of the welded part. Besides, the asymmetry of cross-section profile is likely to be influenced by various processes and parameters, thereby changing the angular distortion.

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“…The welding process realizes the requirements for integration and weight reduction of metal components. The use of laser beam, linear friction, friction stir, and electron beam welding is continuously increasing in the aerospace components [6,7,8,9,10,11]. On the one hand, the electron beam welding (EBW) is used for welding of thick titanium plates due to its high precision, high welding speed, narrow heat-affected zone, and small deformation in welded parts [12,13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Welded Pores on Very Long-Life Fatigue Failure of the Electron Beam Welding Joint of TC17 Titanium Alloy

et al. 2019

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The electron beam welding process is widely used in the connection among titanium alloy material parts of aero-engines. Its mechanical properties need to meet the requirements of long life and high reliability. In this paper, the static strength and the fatigue failure behavior of the electron beam weldments of TC17 titanium alloy were investigated experimentally under low amplitude high frequency (20 kHz), and the mechanical response and failure mechanism under different external loading conditions were analyzed. In summary, the samples were found to have anisotropic microstructure. The tensile strength of the PWHT of TC17 EBW joint was ~4.5% lower than that of the base metal. Meanwhile, compared with the base metal, the fatigue strength was reduced by 45.5% at 109 cycles of fatigue life. The fracture analysis showed that the fatigue failure of the welded joint of TC17 alloy was caused by the welded pores and the fatigue cracks initiated from the welded pores. A fine granular area (FGA) was observed around the crack initiation region. The existence of pores caused the stress intensity factor of the fine granular area (KFGA) to be inversely proportional to the fatigue life. The KFGA calculation formula was modified and the fatigue crack propagation threshold of the welded joint of TC17 alloy was calculated (3.62 MPa·m1/2). Moreover, the influences of the effective size and the relative depth of the pores on the very long fatigue life of the electron beam welded joint of TC17 titanium alloy were discussed.

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A new approach to study the influence of the weld bead morphology on the fatigue behaviour of Ti–6Al–4V laser beam-welded butt joints

Cited by 27 publications

References 23 publications

Prediction and Characteristics of Angular Distortion in Multi-Layer Butt Welding

Prediction and Characteristics of Angular Distortion in Multi-Layer Butt Welding

Cause of Angular Distortion in Fusion Welding: Asymmetric Cross-Sectional Profile along Thickness

Influence of Welded Pores on Very Long-Life Fatigue Failure of the Electron Beam Welding Joint of TC17 Titanium Alloy

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