A comparative study on electron beam welding and rigid restraint thermal self-compressing bonding for Ti6Al4V alloy

Deng, Yunhua; Qiao, Guifang; Wu, Bing; Tao, Jun

doi:10.1016/j.vacuum.2015.03.035

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…Sound solid-state joints with homogeneous microstructure and good comprehensive mechanical properties were obtained. A comparative study on the microstructure and mechanical properties of the Ti6Al4V joints produced by Electron beam welding and rigid restraint TSCB shown that rigid restraint TSCB joint has better combination of strength and ductility than electron beam welded joint [20]. Meanwhile, rigid restraint TSCB also presented the feasibility of joining dissimilar materials [21].…”

Section: Open Accessmentioning

confidence: 99%

Numerical Study on the Stress–Strain Cycle of Thermal Self-Compressing Bonding

Deng

Qiao

Tao

et al. 2018

Chin. J. Mech. Eng.

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Thermal self-compressing bonding (TSCB) is a new solid-state bonding method pioneered by the authors. With electron beam as the non-melted heat source, previous experimental study performed on titanium alloys has proved the feasibility of TSCB. However, the thermal stress-strain process during bonding, which is of very important significance in revealing the mechanism of TSCB, was not analysed. In this paper, finite element analysis method is adopted to numerically study the thermal elasto-plastic stress-strain cycle of thermal self-compressing bonding. It is found that due to the localized heating, a non-uniform temperature distribution is formed during bonding, with the highest temperature existed on the bond interface. The expansion of high temperature materials adjacent to the bond interface are restrained by surrounding cool materials and rigid restraints, and thus an internal elasto-plastic stress-strain field is developed by itself which makes the bond interface subjected to thermal compressive action. This thermal self-compressing action combined with the high temperature on the bond interface promotes the atom diffusion across the bond interface to produce solid-state joints. Due to the relatively large plastic deformation, rigid restraint TSCB obtains sound joints in relatively short time compared to diffusion bonding.

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Section: Open Accessmentioning

confidence: 99%

Numerical Study on the Stress–Strain Cycle of Thermal Self-Compressing Bonding

Deng

Qiao

Tao

et al. 2018

Chin. J. Mech. Eng.

Self Cite

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“…EBW favors the production of deep, narrow joints, which in turn reduces the extension of the HAZ and possible deformations, high stress or stress-induced internal cracks, making it a promising joint method [13]. Due to the predominance mentioned above, the thick alloy sheet joints can be fabricated by EBW, which show well weld seam (WS) with good mechanical properties [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Impact performance and microstructures of thick TA1 titanium alloy sheets welded by vacuum electron beam

Su¹,

Li²,

Qi³

et al. 2019

Phys. Scr.

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Thick TA1 titanium alloy sheets were thoroughly bonded by vacuum electron beam welding (EBW). The results indicated that microstructures in the weld zone (WZ) consisted of coarse α columnar grains, serrated α as well as needle-shaped α′; the microstructure in the heat-affected zone near the WZ side was composed of α′ and α, while the microstructure near the base metal side consisted of α″ and α. The positional relation between the notches and rolling direction had an important role in the impact performance. The EBW joint exhibited higher absorbed impact energy at the weld seam after local heat treatment. Furthermore, lots of dimples were produced on the impact fracture surfaces, exhibiting ductile fractures.

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“…The former may be overcome by applying an argon protective atmosphere, while the latter by a local heating with an electron or a laser beam. [1] The strength of obtained joint is therefore compromised not only by a coarse grain present in melted and solidified material, but also by a large heat-affected zone softened by recovery processes. On the other hand, diffusion brazing process is most frequently performed at temperature below the a fi b transition at~1000°C.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Reactive Resistance Welded Ti6Al4V Parts with the Use of Ni(V)/Al Multilayers

Maj

Morgiel

Mars

et al. 2018

Metall Mater Trans A

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The Ti6Al4V/(Ni/Al)/Ti6Al4V joints were obtained through reactive resistance welding which takes advantage of electric current heating to initiate the rapid exothermic reaction of Ni(V)/Al multilayers and activate diffusion of elements across the Ni/Al-Ti6Al4V interfaces. Simulations of temperature distribution, carried out using COMSOL Ò software, showed temperature gradient in the joint being a result of differences in resistivity of the Ti6Al4V alloy and the (Ni/ Al)/Ti6Al4V interface. Shear tests revealed that extending duration of the process from 2 to 6 minutes helped to improve the shear strength from~240 to~335 MPa. The microstructure observations of the samples after those tests showed that de-cohesion of the joint occurred along the filler material/base material interface. A microcrack network characteristic for reacted Ni/Al foil with small ridges was found on the flat surfaces of fractured samples.

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A comparative study on electron beam welding and rigid restraint thermal self-compressing bonding for Ti6Al4V alloy

Cited by 13 publications

References 20 publications

Numerical Study on the Stress–Strain Cycle of Thermal Self-Compressing Bonding

Numerical Study on the Stress–Strain Cycle of Thermal Self-Compressing Bonding

Impact performance and microstructures of thick TA1 titanium alloy sheets welded by vacuum electron beam

Shear Strength of Reactive Resistance Welded Ti6Al4V Parts with the Use of Ni(V)/Al Multilayers

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