Refining microstructures and enhancing mechanical properties of Inconel 718 weldment via fast-frequency double pulsed waveforms adopting in FFP-TIG

Wu, Jianwen; Xu, Mengjia; Lin, Sanbao; Zhang, Qin; Wu, Xiaohu; Tian, Jiyu; Wang, Zhenmin

doi:10.1016/j.jmatprotec.2023.117882

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…11(b), although there were some α-colony structures, acicular αʹ and rectangular grid martensite αʹ appeared. Both the low frequency and high frequency pulse in the FFDP TIG can increase the stirring effect of the molten pool, which can accelerate weld cooling speed [31]. In Fig.…”

Section: Microstructure Of Bmmentioning

confidence: 99%

“…Due to large heat input of conventional TIG welding, α phase nucleates from the prior β grain boundary and slowly grows through the whole prior β grain. However, the cooling speed of FFDP TIG weld is faster than that of conventional TIG[31]. When FFDP TIG weld rapid cool, the αʹ crystal nucleus of various crystallographic orientations form in the β grain.…”

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confidence: 99%

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Study on arc shape, weldment microstructure, and mechanical properties of Ti-6Al-4V welded by FFDP TIG waveform

Kuang,

Jia,

Zhu

et al. 2024

Int J Adv Manuf Technol

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mainly engaged in the research of new SiC-based welding power supplies, arc welding additive manufacturing. Jianjun Jia is a master candidate in mechanical engineering specialty at the team of Intelligent Welding headed by Prof. Zhenmin Wang. Zeguang Zhu is a master candidate in mechanical engineering specialty at the team of Intelligent Welding headed by Prof. Zhenmin Wang. Zixiao Gui is a master candidate in mechanical engineering specialty at the team of Intelligent Welding headed by Prof. Zhenmin Wang.

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Section: Microstructure Of Bmmentioning

confidence: 99%

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confidence: 99%

Study on arc shape, weldment microstructure, and mechanical properties of Ti-6Al-4V welded by FFDP TIG waveform

Kuang,

Jia,

Zhu

et al. 2024

Int J Adv Manuf Technol

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“…The pulsing current works by switching peak and base currents periodically to create a better stirring effect in FZ. 29 The base and peak currents are switched periodically in DPTIG welding which exerts a pulsating impact on the molten pool. The stirring effect is induced by the interaction of Lorentz force and the Marangoni effect.…”

Section: Introductionmentioning

confidence: 99%

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

Manoj Samson,

Deepan Bharathi Kannan,

Shravan Kumar

2024

Proceedings of the Institution of Mechanical Engineers, Part E:

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This research aims to analyze the welding of 1 mm thick NiTinol sheets using an autogenous double pulse tungsten inert gas (DPTIG) welding process. The effect of heat input (HI) on bead geometry, microstructure, hardness, tensile strength, phase transformation temperature (PTT), and corrosion behavior was studied. The lower (111.25 J/mm), and higher (120.14 J/mm) HI produced an average grain size of 26 μm and 36 μm, respectively. The microstructure of the fusion zone (FZ) had coarser columnar grains with intermetallic phases such as Ni3Ti, and TiO2. The grain size in the FZ increased with the increase in HI. Sample P (111.25 J/mm) showed a higher hardness of 280.54 HV and tensile strength of 566 MPa due to a higher proportion of austenite phase (99.4%), the smaller grain size of 26 µm, a larger fraction of high angle grain boundary (HAGB) of 75.8%, and higher kernel average misorientation (KAM) value of 4.93. Compared to base metal (BM), sample P (111.25 J/mm), and sample S (120.14 J/mm) exhibited a reduction in tensile strength of 19.14% and 32.29%, respectively. The decline in hardness and tensile strength was attributed to the formation of intermetallic phases, a decrease in the Ti/Ni ratio, coarser grain formation, and a decrease in HAGB fraction and KAM values. The fractured tensile samples showed a mixed mode of fracture with dimples and cleavage facets. Compared to BM, Sample Q (118.05 J/mm) exhibited lesser variation in temperature hysteresis values for austenite and martensite temperatures, with a deviation of 0.4°C and 3.1°C, respectively. All the welded samples had better corrosion behavior than the BM due to a higher Ti/Ni ratio.

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“…In recent years, researchers have discovered that introducing a fast-frequency pulsed current (≥20 kHz) in TIG welding would contract the arc and stir the molten metal by the electromagnetic effect to refine grains, avoid defect formation, and improve the mechanical properties of the weld beam [6]. This welding method is called fast-frequency pulsed tungsten inert gas (FFP-TIG) welding [7,8]. Due to the radial electromagnetic contraction force generated by FFP current, the arc plasma is contracted in the radial direction and the arc pressure is raised, causing the welding heat to be effectively transferred to a deeper weld, and thus the evolution of the microstructure and mechanical properties of the welding zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fast-Frequency Pulsed Current Parameters on FFP-TIG arc Behavior and Its Implications for Inconel 718 Welding

Wang

Zhu

et al. 2023

Metals

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Tungsten inert gas (TIG) is currently one of the most widely applied welding technologies. However, the arc energy divergence and high heat input of conventional TIG can lead to welding defects in heat-input-sensitive alloys (such as Inconel 718). Introducing a fast-frequency pulsed current (≥20 kHz) in TIG creates a welding process named fast-frequency pulsed tungsten inert gas (FFP-TIG). The arc behavior of FFP-TIG has advantages over conventional TIG in terms of arc contraction, arc pressure, and energy density. With an increase in the FFP current amplitude or frequency, the arc diameter and arc area are reduced, the arc pressure at the center of the arc is increased, and the arc energy divergence and arc temperature are reduced. The FFP-TIG weld method was adapted for Inconel 718 based on FFP-TIG arc behavior. This study provides fresh insight into the development and application of FFP-TIG arc physics research and industrial applications.

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Refining microstructures and enhancing mechanical properties of Inconel 718 weldment via fast-frequency double pulsed waveforms adopting in FFP-TIG

Cited by 9 publications

References 20 publications

Study on arc shape, weldment microstructure, and mechanical properties of Ti-6Al-4V welded by FFDP TIG waveform

Study on arc shape, weldment microstructure, and mechanical properties of Ti-6Al-4V welded by FFDP TIG waveform

The effect of heat input on weld-bead geometry, mechanical, phase transformation temperature, and corrosion properties of autogenous double pulse TIG welded nitinol sheets

Effect of Fast-Frequency Pulsed Current Parameters on FFP-TIG arc Behavior and Its Implications for Inconel 718 Welding

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