A comparative evaluation of friction and electron beam welds of near-α titanium alloy

Mohandas, T.

doi:10.1016/j.matdes.2009.10.012

Cited by 38 publications

(18 citation statements)

References 9 publications

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“…They also observed that the desired penetration depth and geometry of the laser weld bead were achieved by precisely controlling the laser output parameters. Lu et al (2012,[9]), and Meshram and Mohandas (2010, [10]) investigated the application of EBW to butt-weld Ti-6Al-4V plates and near-α Titanium alloys. The authors pointed out the EBW was an efficient process to join thick plates, achieving high quality welds.…”

Section: Research Backgroundmentioning

confidence: 99%

T-joints of Ti alloys with hybrid laser-MIG welding: macro-graphic and micro-hardness analyses

Spina

Sorgente

Palumbo

et al. 2012

High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications

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Titanium alloys are characterized by high mechanical properties and elevated corrosion resistance. The combination of laser welding with MIG/GMAW has proven to improve beneficial effects of both processes (keyhole, gap-bridging ability) while limiting their drawbacks (high thermal gradient, low mechanical resistance) In this paper, the hybrid Laser-GMAW welding of Ti-6Al-4V 3-mm thick sheets is investigated using a specific designed trailing shield. The joint geometry was the double fillet welded T-joint. Bead morphologies, microstructures and mechanical properties (micro-hardness) of welds were evaluated and compared to those achieved for the base metals.

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Section: Research Backgroundmentioning

confidence: 99%

T-joints of Ti alloys with hybrid laser-MIG welding: macro-graphic and micro-hardness analyses

Spina

Sorgente

Palumbo

et al. 2012

High Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications

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“…8,[10][11][12][13][14][15][16][17][18][19] Some similar and dissimilar joints failed far from the WCZ. 10,12,14,15,17,18 For instance, Dalgaard et al 20 observed that the formation of a fine microstructure in the WCZ of a similar IMI-834 LFW joint led to a weld overmatch. In a similar manner, Li et al 13 documented the weld overmatch of a Ti-6Al-4V LFW joint.…”

Section: Introductionmentioning

confidence: 99%

Strength and fatigue strength of a similar Ti‐6Al‐2Sn‐4Zr‐2Mo‐0.1Si linear friction welded joint

García

Morgeneyer

2019

Fatigue Fract Eng Mat Struct

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Strengths for monotonic and cyclic loadings of similar overmatching Ti‐6Al‐2Sn‐4Zr‐2Mo‐0.1Si (Ti6242) linear friction welds (LFW) were studied and compared with the parent material (PM) behaviour. Non‐destructive synchrotron observations revealed the presence of pores in the weld interface. The weld centre zone (WCZ) showed a higher strength leading to lower macroscopic ductility of the cross‐weld samples. Local strain and normalized strain rate have been assessed by stereo digital image correlation (DIC) and revealed an early plastic activity at yielding in the vicinity of the WCZ attributed to residual stresses. For the target life, the fatigue strength was slightly reduced but compromised by a strong scatter. Indeed, an internal fish‐eye fatigue crack initiation was found on an unexpected dendritic defect that was very different from the PM microstructure and the known martensitic α′ in the WCZ. The dendritic defect was linked to surface contamination prior to welding and led to melting.

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“…Compared with fusion welding, solid-state welding method, such as diffusion bonding [14], linear fraction welding [15] and friction stir welding [16], has many outstanding advantages. The first one is solid state joint is attained, which avoid the as-cast microstructure and metallurgical defects such as pores and cracks emerged…”

Section: Introductionmentioning

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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A comparative evaluation of friction and electron beam welds of near-α titanium alloy

Cited by 38 publications

References 9 publications

T-joints of Ti alloys with hybrid laser-MIG welding: macro-graphic and micro-hardness analyses

T-joints of Ti alloys with hybrid laser-MIG welding: macro-graphic and micro-hardness analyses

Strength and fatigue strength of a similar Ti‐6Al‐2Sn‐4Zr‐2Mo‐0.1Si linear friction welded joint

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

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