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

Caggiano, Alessandra

doi:10.3390/ma11040632

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…Metals 2023, 13, 1283 2 of 16 Amorphous alloys have been successfully connected by friction welding [11,12], explosive welding [13,14], electron beam welding [15], and laser welding [16,17]. Compared with other welding methods, laser welding has great advantages [18,19]. Laser welding is a method of welding two parts together by using the radiation energy of a laser to bring the temperature of the welded part to the melting point.…”

Section: Introductionmentioning

confidence: 99%

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Yan

Song

Huang

et al. 2023

Metals

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Crystallization often occurs in the laser welding of amorphous alloys, reducing the properties of amorphous alloys. Therefore, the research in this thesis focuses on the experimental selection of suitable welding parameters to prevent crystallization of Zr-based amorphous alloys during the laser welding process. As such, it is necessary to simulate the temperature field curve of the welding area by computer and then determine the power and laser moving speed of laser welding. In this paper, the temperature field curve of the Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit1) amorphous alloy in laser welding is obtained by finite element analysis. The continuous heating curve (CHT) of Vit1 is fitted by the Vogel–Fulcher–Tammann (VFT) equation and the Kissinger equation. If the temperature field curve intersects with the CHT curve, crystallization occurs. The experiment results show that the VFT equation can be used to predict the crystallization of Vit1 better in laser welding. The temperature and welding time are increased by using a low welding speed. Therefore, the temperature of the weld zone cannot fall in time, resulting in the intersection of the temperature field curve and the CHT curve. Thus, crystallization can be avoided if the welding speed is controlled within a reasonable range, and the highest temperature is kept under the CHT curve. The combination of the CHT curve and the temperature field curve shows that the samples at 300 W-3 mm/s and 300 W-6 mm/s welding parameters all undergo crystallization, while the samples at 300 W-9 mm/s and 300 W-12 mm/s welding parameters do not undergo crystallization. Through the flexural test, it is found that the flexural strength of the welded interface is at its the maximum under 300 W-9 mm/s.

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Section: Introductionmentioning

confidence: 99%

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Yan

Song

Huang

et al. 2023

Metals

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“…Laser welding has been rapidly developed and applied in recent years as a new welding method, and it possesses high energy density, fast heating and cooling speeds, a narrow welding seam and a small heat affected zone [1,2,3,4]. This technology not only effectively reduces intermetallic compounds inside the weldment, but also appropriately heats local micro-regions.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Study of Fe-Mn-Si Shape Memory Alloys Welding Seam Formed by Laser Welding with Filler Powder

Chen

Tian

et al. 2018

Materials

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To reduce the residual stress and improve the fatigue property of the laser weldment by using the stress self-accommodation characteristic of Fe-Mn-Si shape memory alloys (SMAs), a Fe15Mn5Si12Cr6Ni memory alloy welding seam was formed inside 304 stainless steel by laser welding with filler powder. The combination of the hole-drilling method and the ANSYS software was used to research the distribution law of residual stress inside the laser welding specimen. The fatigue strength of the laser welded specimens with the Fe-Mn-Si SMAs welding seam (experimental materials) and 304 stainless steel welding seam (comparative materials) was measured by cycle bending fatigue test. The microhardness of the welding specimens was measured by the microhardness tester. The thermodynamic model of the laser welding process and the phase transition crystallography of Fe-Mn-Si SMAs were evaluated to analyze the strengthening mechanism of the mechanical properties in the experimental materials. The results show that the distribution law for residual stress in the experiment and simulation are consistent. The experimental materials possess low residual stress, high fatigue strength and high microhardness. The strengthening mechanism for mechanical properties is the welding residual stress-induced γ→ε martensitic transformation inside the experimental materials, which causes the tensile plastic strain of the welding seam to resist residual compression strain, and the residual stress, as the transition driving force, is released in shear processing.

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“…AA 2024 aluminum alloy is a highstrength alloy. It is used in the transport industry for hardware parts and the aircraft industry for precision fittings and structural components (wing and fuselage parts under tension); it is worth noting that precisely machined materials exhibiting high strength-to-weight ratio, hardness, and fatigue strength are required in those industries [15,16]. Some difficulties could be occurred in the machining process of AA 2024 aluminum because of the chip formation-based problems [12,[17][18][19].…”

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confidence: 99%

Machinability of AA 2024 aluminum alloy by fiber laser engraving process

Kasman

Ozan

2023

Materialwissenschaft Werkst

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The main objective of the present study is to investigate the machinability of AA 2024-T351 aluminum alloy by laser beam-assisted engraving process. The surface in a defined area was machined with the engraving process parameters of scan speed, frequency, and pulse width. While surface roughness measurements were performed to characterize the texture of the processed surface with laser engraving parameters, machining depth measurements were carried out to determine the material removal capacity. In addition, a mathematical relation was built for engraving depth and surface roughness using the response surface methodology. An increase in scan speed and pulse width led to a decrease in engraving depth and surface roughness. Unlike the scan speed and pulse width, any increase in frequency led to increased surface roughness and decreased engraving depth. After processing with lower pulse width and scan speed, a chaotic topography was formed on the surface.The effects of process parameters on engraving depth and surface roughness were analyzed statistically using factorial analysis. Except for the frequency, all parameters for surface roughness were statistically significant, whereas all parameters for engraving depth were statistically significant.

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

Cited by 11 publications

References 12 publications

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Crystallization of Zr-Based Amorphous Alloys in Laser Welding

Mechanical Properties Study of Fe-Mn-Si Shape Memory Alloys Welding Seam Formed by Laser Welding with Filler Powder

Machinability of AA 2024 aluminum alloy by fiber laser engraving process

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