Research on the “∞”-shaped laser scanning welding process for aluminum alloy

Chen, Genyu; Wang, Bin; Mao, Shuai; Zhong, Peixin; He, Jinliao

doi:10.1016/j.optlastec.2019.01.046

Cited by 62 publications

(23 citation statements)

References 8 publications

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“…Before the experiment, aluminum tubes were sanded with sandpaper to remove surface oxides and then cleaned with anhydrous ethanol [ 24 ]. The influence of the water environment on the laser cladding process, cladding appearance, geometry characteristics, microstructure, regional segregation and the microhardness of the multi-channel laser cladding samples was studied.…”

Section: Methodsmentioning

confidence: 99%

“…At present, research on underwater materials mainly focuses on stainless steel and titanium alloy, while research on aluminum alloy is sparser. Aluminum alloy has been widely used in nuclear power-plant, ocean and other underwater engineering fields due to its high specific strength and strong corrosion resistance [ 20 , 21 , 22 , 23 , 24 ]. In this paper, the influence of the water environment on the quality of multi-channel wire-feed laser cladding was investigated by analyzing the laser cladding process, cladding appearance, geometry characteristics, microstructure, regional segregation and microhardness.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Formation of Laser-Cladded Layer on Thin-Walled Tube of Aluminum Alloy in Underwater Environment

et al. 2021

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The first study of thin-walled aluminum-alloy tubes with underwater-laser-nozzle in situ melting technology was carried out. The study mainly covered the influence of the water environment on the laser melting process, melting appearance, geometric characteristics, microstructure, regional segregation and microhardness. During the transfer of the cladding environment from air to water, the uniformity of the cladding layer became poor, but excellent metallurgical bonding was still obtained. The dilution rate (D) decreased from 0.46 to 0.33, while the shape factor (S) increased from 4.38 to 5.98. For the in-air and underwater samples, the microstructure of the melting zone (MZ) and the cladding zone (CZ) were columnar dendrites and equiaxed grains, respectively. In addition, the microstructure of the overlapping zone (OZ) was composed of columnar dendrites and equiaxed grains. The underwater average grain size was smaller than that of in-air. In addition, the water environment was beneficial for reducing the positive segregation in the columnar dendrite region. Compared with the in-air cladding sample, the precipitated phases in the OZ of the underwater cladding sample reduced. Under the combined action of grain refinement and precipitated phase reduction, the microhardness value of the underwater OZ was higher than that of the in-air OZ.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Formation of Laser-Cladded Layer on Thin-Walled Tube of Aluminum Alloy in Underwater Environment

et al. 2021

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“…Laser scanning welding is a new welding technique that emerged in recent years. Different scanning welding trajectories can be achieved by controlling the galvanometer scanner [7]. Laser scanning welding technology reportedly has the potential to improve tolerances of joint gaps, microstructure homogeneity, and weld quality.…”

Section: Introductionmentioning

confidence: 99%

“…"∞"-shaped laser scanning welding has gained significant interest from academia and industry in recent years. Moreover, the "∞"-shaped laser scanning welding pool has good stability and an obvious inhibitory effect on the pore defects in the aluminum alloy weld, thus reducing the porosity to within 1% [7]. Wang et al verified that compared to the linear and circle oscillating modes, the novel infinity beam oscillating presented fewer welding defects and better mechanical properties [14].…”

Section: Introductionmentioning

confidence: 99%

“…Li et al found that when the welding oscillation amplitude of 304SS was lower than 0.4 mm, the weld penetration was unchanged; otherwise, the weld penetration and area were greatly decreased as the oscillation amplitude increased, an outcome caused by the welding mode variation [3]. Chen et al concluded that the penetration of the "∞"-shaped laser scanning weld were inversely proportional to the scanning amplitude and scanning frequency of 5052 aluminum alloy, and the weld crosssection was a wide U-shape [7]. However, the relationship model between laser scanning welding parameters and penetration, especially for "∞"-shaped laser scanning welding, remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Penetration Depth Prediction of Infinity Shaped Laser Scanning Welding Based on Latin Hypercube Sampling and the Neuroevolution of Augmenting Topologies

2021

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This paper builds an infinity shaped (“∞”-shaped) laser scanning welding test platform based on a self-developed motion controller and galvanometer scanner control gateway, takes the autogenous bead-on-plate welding of 304SS with 3 mm thick specimens as the experimental objects, designs the experimental parameters by the Latin hypercube sampling method for obtaining different penetration depth welded joints, and presents a methodology based on the neuroevolution of augmenting topologies for predicting the penetration depth of “∞”-shaped laser scanning welding. Laser power, welding speed, scanning frequency, and scanning amplitude are set as the input parameters of the model, and welding depth (WD) as the output parameter of the model. The model can accurately reflect the nonlinear relationship between the main welding parameters and WD by validation. Moreover, the normalized root mean square error (NRMSE) of the welding depth is about 6.2%. On the whole, the proposed methodology and model can be employed for guiding the actual work in the main process parameters’ preliminary selection and lay the foundation for the study of penetration morphology control of “∞”-shaped laser scanning welding.

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