Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy

Köse, Ceyhun; Karaca, Engin

doi:10.3390/met7060221

Cited by 22 publications

(15 citation statements)

References 32 publications

(36 reference statements)

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“…In welding titanium and its alloys, a narrow welding seam and a microstructure made of fine grains should be achieved by lowering the heat input transfer to the weld zone and increasing the cooling rate. On the other hand, very fast cooling conditions lead to weld metal microstructures that are completely martensitic in nature and thus have a lower toughness [24][25][26][27]. Cui Li et al [28] also observed a significant grain coarsening occurred in the HAZ immediately adjacent to the base metal, and the degree of grain coarsening increases as the grains move towards the centre of the fusion zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints

Vyskoč¹,

Dománková²,

Sahul³

et al. 2020

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The paper deals with the evaluation of the shielding gas influence on the properties of titanium Grade 2 weld joints produced with disk laser. Butt weld joints were produced under different shielding gas types, namely Ar, He, Ar + 5 vol.% He, Ar + 30 vol.% He, and without shielding weld pool. Light and electron microscopy, microhardness measurements, computed tomography, and tensile testing were used for evaluation of weld joint properties. He-shielded weld joints were the narrowest ones. On the other hand, Ar-shielded weld joints exhibited the largest weld width. The choice of shielding gas had a significant influence on the porosity of welds. The lowest porosity was observed in the weld joint produced in Ar with the addition of 30 vol.% He shielding atmosphere (only 0.03 %), while the highest level of porosity was detected in weld joint produced without shielding gas (0.76 %). Except for unshielded titanium Grade 2 weld joint, the lowest tensile strength was recorded in Ar-shielded weld joints. On the contrary, the highest average microhardness, except unshielded weld joint, was measured in He-shielded weld joints.

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Section: Introductionmentioning

confidence: 99%

Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints

Vyskoč¹,

Dománková²,

Sahul³

et al. 2020

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“…For these reasons, a number of scientific studies are available in the literature dealing with laser beam welding of titanium alloys [ 6 , 7 ], which are widely used in aerospace thanks to their high strength in combination with low density and good tensile properties; medical and surgical devices are even produced using these alloys, thanks to high biocompatibility [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Laser Welding of Ti Alloys for Cognitive Process Parameters Selection

Caggiano

2018

Materials

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Laser welding of titanium alloys is attracting increasing interest as an alternative to traditional joining techniques for industrial applications, with particular reference to the aerospace sector, where welded assemblies allow for the reduction of the buy-to-fly ratio, compared to other traditional mechanical joining techniques. In this research work, an investigation on laser welding of Ti–6Al–4V alloy plates is carried out through an experimental testing campaign, under different process conditions, in order to perform a characterization of the produced weld bead geometry, with the final aim of developing a cognitive methodology able to support decision-making about the selection of the suitable laser welding process parameters. The methodology is based on the employment of artificial neural networks able to identify correlations between the laser welding process parameters, with particular reference to the laser power, welding speed and defocusing distance, and the weld bead geometric features, on the basis of the collected experimental data.

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“…Ti6Al4V titanium alloy is widely used in the aerospace, marine, pressure vessel, and chemical industries, as well as for surgical implant, etc., owing to its unique properties, such as a high strength-to-weight ratio, excellent high-temperature properties and corrosion resistance; furthermore, the usage of Ti6Al4V alloy accounts for over 50% of the total titanium alloy tonnage, globally [1][2][3][4][5]. Many welding methods, such as tungsten inert gas welding (TIG) [6,7], laser welding [8], electron beam welding [9], plasma arc welding [10], line friction welding [11][12][13], and friction stir welding [14,15] have been employed to weld titanium alloy in previous investigations.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Resistance Spot Welded Ti6Al4V Titanium Alloy Sheets

Zhang

Chen

et al. 2017

Metals

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Ti6Al4V titanium alloy is applied extensively in the aviation, aerospace, jet engine, and marine industries owing to its strength-to-weight ratio, excellent high-temperature properties and corrosion resistance. In order to extend the application range, investigations on welding characteristics of Ti6Al4V alloy using more welding methods are required. In the present study, Ti6Al4V alloy sheets were joined using resistance spot welding, and the weld nugget formation, mechanical properties (including tensile strength and hardness), and microstructure features of the resistance spot-welded joints were analyzed and evaluated. The visible indentations on the weld nugget surfaces caused by the electrode force and the surface expulsion were severe due to the high welding current. The weld nugget width at the sheets' faying surface was mainly affected by the welding current and welding time, and the welded joint height at weld nugget center was chiefly associated with electrode force. The maximum tensile load of welded joint was up to 14.3 kN in the pullout failure mode. The hardness of the weld nugget was the highest because of the coarse acicular α structure, and the hardness of the heat-affected zone increased in comparison to the base metal due to the transformation of the β phase to some fine acicular α phase.

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Robotic Nd:YAG Fiber Laser Welding of Ti-6Al-4V Alloy

Cited by 22 publications

References 32 publications

Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints

Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints

Investigation of Laser Welding of Ti Alloys for Cognitive Process Parameters Selection

Characteristics of Resistance Spot Welded Ti6Al4V Titanium Alloy Sheets

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