Effect of welding parameters on spatter formation in full-penetration laser welding of titanium alloys

Cheng, Hao; Liangang, Zhou; Li, Qijun; Du, Dong; Chang, Baohua

doi:10.1016/j.jmrt.2021.11.006

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…The absorption rate of metal for laser can be approximated by the following formula [13]: whereεh (t) is the absorption rate of metal at temperature t, γ is the resistivity of metal material at temperature 20℃, β is resistance temperature coefficient, t is temperature, λ is laser wavelength.…”

Section: Test Results and Analysis 31 Relationship Between Laser And ...mentioning

confidence: 99%

Characteristics of welding laser beam and its influence on weld forming coefficient

Han,

Jia,

2024

J. Phys.: Conf. Ser.

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Laser welding is a very complicated process. At present, there is no systematic research on the relationship between welding parameters and forming coefficient. By studying the internal relationship between laser parameters and the characteristics of welding laser, laser beam indexes, such as focusing index, are defined. They are simplified to a few laser parameters so as to facilitate the study of the influence of welding parameters on the forming coefficient. The results show that material, assembly gap, laser power and welding speed have great influence on weld penetration. When the laser power density reaches 106J/cm2, the characteristics of deep penetration welding appear. Under the condition of constant clearance, the weld depth increases with the increase of t/b. The weld penetration increases with the increase of laser power and tends to be stable when the welding speed is 12mm/s. Different materials also have a certain influence on the weld penetration depth. Under the same conditions, X6CrNiTi1810 obtains greater penetration depth, indicating that physical and chemical properties of materials are also one of the factors affecting the penetration depth. The mechanism and condition of laser welding were analysed. The relationship between laser absorptivity of sheet surface and physical properties of the materials is also studied and then obtained. The study will provide theoretical guidance for laser welding process design and welding parameter selection of steel plate.

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Section: Test Results and Analysis 31 Relationship Between Laser And ...mentioning

confidence: 99%

Characteristics of welding laser beam and its influence on weld forming coefficient

Han,

Jia,

2024

J. Phys.: Conf. Ser.

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“…The double ellipsoid heat source model includes two parts, the front and the rear, as shown in Figure 6. For the heat flux density Q (x, y, z) at a point (x, y, z) in the heat source model, it can be expressed by Equation (3).…”

Section: Heat Source Modelmentioning

confidence: 99%

“…However, due to the poor thermal conductivity and susceptibility to oxidation at high temperatures, the welding of TC4 titanium alloy plates for special vehicles requires special processes. Many advanced and efficient joining technologies for TC4 titanium alloy structures have been developed and applied, among which electron beam welding and laser welding have the advantages of fast welding speeds and narrow heat-affected zones of welds [3][4][5]. However, TC4 titanium alloy sheets have low absorption by the laser, and electron beam welding of titanium alloy needs to be carried out in a specific vacuum environment, making the two processes inefficient and expensive for specific applications.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Study of TIG Welding of Ti-6Al-4V for Residual Stresses Considering Solid State Phase Transformation

Liu

Zheng

et al. 2023

Metals

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To overcome the detrimental effect of residual stress in welded joints, which affects the overall performance of the welded structure, this paper studies the magnitude and distribution of residual stress after welding and local post-weld heat treatment (PWHT). The coupled thermo-metallurgical-mechanical model for welding 6 mm thick Ti-6Al-4V (TC4) titanium alloy plates was established, the evolution of the SSPT and its effect on the residual stress were quantitatively analyzed, and a parametric analysis of local PWHT was performed. The results demonstrated that there was good agreement between the numerical results and the experimental data. Due to the cooling rate reaching 327 °C/s, the volume fraction of α、 in the fusion zone (FZ) reached 0.218 after welding and decreased by 90.83% after PWHT when the heating temperature was 700 °C. The peak value of the longitudinal residual stress can reach 686.4 MPa after welding with SSPT, which was 11.38% lower than that without SSPT, and it decreased by 65.6% after PWHT when the heating temperature was 900 °C. The research results demonstrate that SSPT has a significant effect on residual stress, and PWHT can obviously reduce the residual stress, which provides a certain reference for welding TC4 titanium alloy plates.

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“…During laser welding of TC4 titanium alloy, the fatigue fracture of the welded joint is mainly related to the microstructure and surface morphology [4]. However, defects such as undercut, cracks, and pores often occur during the welding process, which seriously affect the mechanical and corrosion resistance properties of the welded joint [5][6][7][8][9]. These defects cause stress concentration on the surface and nearsurface, thereby forming crack initiations.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic rolling on the fatigue performance of laser-welded TC4 titanium alloy joints

Jiahui,

Jiayuan,

Song

et al. 2024

Int J Fract

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In order to improve the fatigue performance of TC4 titanium alloy laser welded joints, ultrasonic rolling treatment was adopted in this study, and different passes of rolling process were used. The research results show that the ultrasonic rolling treatment significantly improves the fatigue limit and fatigue life of the weldment. At room temperature, the fatigue strength of the weldment increases by 2.04% to 4.58%, and the corrosion fatigue life increases by 1.71 to 3.05 times. This study also deeply analyzed the significant effects of ultrasonic rolling treatment on surface morphology, microstructure, surface residual stress and microhardness to reveal its strengthening mechanism. It was found that the ultrasonic rolling treatment shifted the crack initiation point to the subsurface and formed a hard layer with high residual stress on the surface by applying significant static pressure input and multiple treatments. This change makes the fatigue stripes narrower and denser. Compared with the traditional weld surface treatment method, ultrasonic rolling treatment significantly improves the surface quality and fatigue performance of TC4 titanium alloy laser welded joints.

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Effect of welding parameters on spatter formation in full-penetration laser welding of titanium alloys

Cited by 15 publications

References 21 publications

Characteristics of welding laser beam and its influence on weld forming coefficient

Characteristics of welding laser beam and its influence on weld forming coefficient

Thermo-Mechanical Study of TIG Welding of Ti-6Al-4V for Residual Stresses Considering Solid State Phase Transformation

Effect of ultrasonic rolling on the fatigue performance of laser-welded TC4 titanium alloy joints

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