A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet

Junaid, Massab; Baig, Mirza Nadeem; Shamir, Muhammad; Khan, Fahd Nawaz; Rehman, Khalid Mehmood Ur; Haider, Julfikar

doi:10.1016/j.jmatprotec.2016.11.018

Cited by 67 publications

(43 citation statements)

References 47 publications

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“…To protect the molten titanium pool from oxidation, the flow of argon with a flow rate in the range 10 to12 L/min was maintained during and after the welding operation. The details of residual stress measurement procedure and microscopy are given in detail in the author's previous work 15 .…”

Section: Methodsmentioning

confidence: 99%

Response surface approach to minimize the residual stresses in full penetration pulsed TIG weldments of Ti-5Al-2.5Sn alloy

Khan

Junaid

Baig³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Pulsation of current in tungsten inert gas (TIG) welding is employed to obtain good quality weldments. Peak current, background current, and welding speed in TIG welding are important parameters and their effects on the induced residual stresses are studied using Box–Behnken design methodology. The location of maximum residual stress was found to be close to the weld centerline. Longitudinal and transverse residual stresses at this location were found to be dependent on the pulsed TIG welding input parameters. However, using design of experiment approach, welding speed was found to have the most dominant influence on the stress values. In order to minimize the residual stresses, a reduction in heat input also led to reduction of weld pool penetration. The results of multiresponse optimization showed that in order to achieve a full penetration weldment, a minimum value of 235 MPa for longitudinal and 84 MPa for transverse residual stress will be attained. A weldment with these features can be obtained by using a high value of peak current and a high value of welding speed.

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Section: Methodsmentioning

confidence: 99%

Response surface approach to minimize the residual stresses in full penetration pulsed TIG weldments of Ti-5Al-2.5Sn alloy

Khan

Junaid

Baig³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…This can be explained in terms of the presence of α and β phases in both the L-HAZ and BM. Indeed, due to a small testing zone (about 5 µm) and coarser α and β sizes, depending on whether the measurement location was on α or β phase, a different chemical composition was measured as these alloying elements have different affinities for α and β phases [33]. …”

Section: Microstructural Characterizationmentioning

confidence: 99%

Laser Welding of BTi-6431S High Temperature Titanium Alloy

Zeng

Oliveira

et al. 2017

Metals

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Abstract:A new type of high temperature titanium alloy, BTi-6431S, has recently become the focus of attention as a potential material for aircraft engine applications, which could be used up to 700 • C. Pulsed laser welding was used to butt join the BTi-6431S titanium alloy in order to understand the feasibility of using fusion-based welding techniques on this material. The effect of laser energy on the microstructure and mechanical properties of the joints was investigated. The microstructural features of the joints were characterized by means of microscopy and X-ray diffraction. Tensile testing was conducted at both room temperature and high temperature to simulate potential service conditions. The results show that the microstructure of the laser welded joints consists of primary α phase and needle α' phase, while the microstructure of the heat affected zone consists of α, β, and needle α' phases. The tensile strength of the welded joints at room temperature was similar to that of the base material, despite a reduction in the maximum elongation was observed. This was related to the unfavorable microstructure in the welded joints. Nonetheless, based on these results, it is suggested that laser welding is a promising joining technique for the new BTi-6431S titanium alloy for aerospace applications.

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“…The research on the joining of TC4 alloy has been well reported, such as tungsten inert-gas welding (TIG) [4][5][6], metal inert-gas welding (MIG) [7], electron beam welding [8][9][10][11], laser beam welding [12][13][14], and laser-MIG hybrid (LAMIG) welding [15,16]. Among these welding techniques, LAMIG welding is suitable for the joining of TC4 alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tensile Property of the Joint of Laser-MIG Hybrid Welded Thick-Section TC4 Alloy

Wang

Chen

et al. 2018

Metals

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In this paper, thick-section TC4 alloy was welded to itself by laser-MIG hybrid (LAMIG) welding. The microstructure of the welded joints was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results revealed that α’ and β phases were formed in the weld seam. The effects of heat input (E) on the microstructure and tensile strength of the joints were investigated. With the increase of heat input, the residence time of platelet α’ martensite in the high-temperature phase changing zone became longer and the thickness of platelet α’ martensite increased. Furthermore, the β thickness became large, and tangling dislocations were found to exist in platelet α’. In addition, the increasing heat input could cause a decrease in the tensile strength. The failed dimple pattern experienced a change from equiaxed to tearing, which was harmful to the property of the joint.

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A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet

Cited by 67 publications

References 47 publications

Response surface approach to minimize the residual stresses in full penetration pulsed TIG weldments of Ti-5Al-2.5Sn alloy

Response surface approach to minimize the residual stresses in full penetration pulsed TIG weldments of Ti-5Al-2.5Sn alloy

Laser Welding of BTi-6431S High Temperature Titanium Alloy

Microstructure and Tensile Property of the Joint of Laser-MIG Hybrid Welded Thick-Section TC4 Alloy

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