Effect of pulsation in TIG welding on the microstructure, residual stresses, tensile and impact properties of Ti-5Al-2.5Sn alloy

Khan, Fahd Nawaz; Junaid, Massab; Hassan, Ali Abdelhafeez; Baig, Mirza Nadeem

doi:10.1177/0954408920964689

Cited by 3 publications

(4 citation statements)

References 25 publications

(32 reference statements)

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“…Severe grain coarsening usually appears of β grains in the weld region, and the grains that appear in the weld region can be up to few millimeter. 30,31 Sometimes, at higher magnifications, it is not possible to capture complete grain or see grain boundaries in the micrographs. Figure 3(a) and (b) shows the microstructure of the weld zone near the fusion boundary of the CP-Ti side and the Ti–6Al–4V side of autogenous weld.…”

Section: Resultsmentioning

confidence: 99%

Investigation of microstructure evolution and mechanical properties of gas tungsten arc welded dissimilar titanium (CP-Ti/Ti–6Al–4V) alloys

Kumar

Mahto

Rana

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Economical welding of dissimilar titanium alloys has always been a challenge for the aerospace and nuclear industries, where these alloys are extensively used because of their high strength-to-weight ratio. The present investigation deals with the development of a novel shielding setup for the successful welding of commercially pure titanium (α-phase) to Ti–6Al–4V ((α + β)-phase) without any atmospheric contamination using gas tungsten arc welding. Commercially pure titanium (CP-Ti) and Ti–6Al–4V sheets of 3 mm thickness were butt-welded autogenously and using CP-Ti filler metal. Metallographic studies, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, microhardness measurements, tensile testing, and fractography were carried out to understand the evolution of the microstructure and characterize the welds. Grain coarsening in heat-affected zone and weld, and variation in the distribution of phases were observed from the optical micrographs and energy-dispersive X-ray spectroscopy spectrum of different zones. An unsymmetrical variation of hardness was observed in the weld region, and a 15% reduction in hardness value (280 HV0.2) was obtained at the weld center of using filler metal weld than autogenous weld. Comparable strengths with little drop from as-received CP-Ti (307 MPa) were observed for welded specimens. Welds produced using CP-Ti filler metal (272 MPa) had higher strength than autogenous welds (214 MPa). As-received tensile specimens fractured nearly from the center of gauge length, but welded tensile specimens fractured near the base/heat-affected zone boundary of the CP-Ti side.

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Section: Resultsmentioning

confidence: 99%

Investigation of microstructure evolution and mechanical properties of gas tungsten arc welded dissimilar titanium (CP-Ti/Ti–6Al–4V) alloys

Kumar

Mahto

Rana

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Plate specimens with dimensions of 4mm thickness, 100mm length, and 50mm width were selected for friction stir welding (FSW) and tungsten inert gas (TIG) welding. Simple butt weld joints were fabricated along the lamination direction under ambient conditions [32]. The chemical compositions and mechanical properties of the specimens provided by the supplier are presented in Tables 1 and 2, respectively.…”

Section: Methodsmentioning

confidence: 99%

Mechanical and Corrosion Properties of Friction Stir Welded and Tungsten Inert Gas Welded Phosphor Bronze

Gopi,

Mohan,

Natarajan

2023

Advances in Materials Science

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This study investigated the mechanical and corrosion properties of Friction Stir Welded (FSW) and Tungsten Inert Gas (TIG) welded phosphor bronze (CuSn4) joints. Corrosion tests were conducted on the welded joints, and the percentage of weight loss due to corrosion was measured at different time intervals. Results revealed that the percentage of weight loss due to corrosion of the TIG joint increased with time, whereas the percentage of weight loss due to corrosion of the FSW welded joint remained constant. This could be attributed to recrystallisation that happened in the solid-state welding, which reduced corrosion in the FSW welded joint. In addition, tensile tests were conducted to evaluate the strength of the joints. FSW with a spindle speed of 1300 rpm, weld speed of 0.06mm/sec, plunge depth of 0.25mm, pin profile of pentagon, and flat shoulder profile was found to produce good results. TIG welding with a welding speed of 1.75mm/sec, a gas flow rate of 7.5 cm3/min and an amperage of 120A also produced good results. The tensile strength of FSW was found to be approximately 1.6 times higher than that of TIG welding.

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“…Pulsation of current also leads to grain refinement which significantly improves the weld joint strength. 19,20 When compared to laser and electron beam welding, the heat input in the TIG welding process is relatively high which may lead to welding defects. To address this issue, Tomkow et al 21 analyzed different distributions of tack welds and their sequence in TIG welding of AISI 441 steel.…”

Section: Introductionmentioning

confidence: 99%

“…A number of variants of the TIG welding process are available such as narrow gap, keyhole, active flux, and pulsed welding. 13,15,[17][18][19] In pulsed mode of TIG welding, the current oscillates between a maximum and minimum value resulting in a better utilization of arc energy. Pulsation of current also leads to grain refinement which significantly improves the weld joint strength.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar tungsten inert gas welding between Inconel 718 and commercially pure titanium using a vanadium interlayer

Shehbaz

Junaid

Khan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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A weight reduction of aero engines, in order to enhance their efficiency would be possible if the commercially pure titanium in the low-temperature region of the compressor could be welded with Inconel in the high-temperature portion. This joining of titanium/Inconel is challenging owing to the formation of hard TixNiy intermetallic compounds, the suppression of which is not possible using the conventional weld process optimization approach. In recent years, a number of approaches have been developed to reduce or eliminate these intermetallic compounds during welding and one approach is the use of an interlayer during the welding operation. The insertion of a V interlayer at the root side remarkably suppressed Ti and Ni diffusion across the interlayer. NiV3 and (Ti, V) solid solutions were present in the interfacial microstructure of V/Inconel 718 and V/commercially pure titanium, respectively, as characterized by scanning electron microscope and X-ray diffraction. The tensile strength of the weldment was 190 MPa (approx. 59% of the commercially pure titanium base metal) with an elastic modulus comparable with that of the base alloys. The joint exhibited brittle fracture at the Inconel 718 side near the V/Inconel 718 interface due to intermetallic compounds.

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Effect of pulsation in TIG welding on the microstructure, residual stresses, tensile and impact properties of Ti-5Al-2.5Sn alloy

Cited by 3 publications

References 25 publications

Investigation of microstructure evolution and mechanical properties of gas tungsten arc welded dissimilar titanium (CP-Ti/Ti–6Al–4V) alloys

Investigation of microstructure evolution and mechanical properties of gas tungsten arc welded dissimilar titanium (CP-Ti/Ti–6Al–4V) alloys

Mechanical and Corrosion Properties of Friction Stir Welded and Tungsten Inert Gas Welded Phosphor Bronze

Dissimilar tungsten inert gas welding between Inconel 718 and commercially pure titanium using a vanadium interlayer

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