Contribution to the Laser Welding of Wrought and Spray‐Compacted Aluminum Alloys and the Impact of the Alloy Composition on the Welding Microstructure

Gietzelt, Thomas; Eichhorn, L.; Wunsch, Torsten; Gerhards, Uta; Przeorski, T.; Weiss, H.; Dittmeyer, Roland

doi:10.1002/adem.201300497

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…The focal offset (FOP), see Figure 2b, represents the distance between the laser focus and the surface to be processed. The diameter d0 is 0.1 mm (in focus, FOP = 0) when the disk laser is coupled with a 100 µm optical fiber [37]. Larger laser spot sizes are obtained with the variation of the focal position via focal offset (Figure 2b).…”

Section: Laser System and Polishing Processmentioning

confidence: 99%

Multiobjective Optimization of Laser Polishing of Additively Manufactured Ti-6Al-4V Parts for Minimum Surface Roughness and Heat-Affected Zone

et al. 2022

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Metal parts produced by additive manufacturing often require postprocessing to meet the specifications of the final product, which can make the process chain long and complex. Laser post-processes can be a valuable addition to conventional finishing methods. Laser polishing, specifically, is proving to be a great asset in improving the surface quality of parts in a relatively short time. For process development, experimental analysis can be extensive and expensive regarding the time requirement and laboratory facilities, while computational simulations demand the development of numerical models that, once validated, provide valuable tools for parameter optimization. In this work, experiments and simulations are performed based on the design of experiments to assess the effects of the parametric inputs on the resulting surface roughness and heat-affected zone depths. The data obtained are used to create both linear regression and artificial neural network models for each variable. The models with the best performance are then used in a multiobjective genetic algorithm optimization to establish combinations of parameters. The proposed approach successfully identifies an acceptable range of values for the given input parameters (laser power, focal offset, axial feed rate, number of repetitions, and scanning speed) to produce satisfactory values of Ra and HAZ simultaneously.

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Section: Laser System and Polishing Processmentioning

confidence: 99%

Multiobjective Optimization of Laser Polishing of Additively Manufactured Ti-6Al-4V Parts for Minimum Surface Roughness and Heat-Affected Zone

et al. 2022

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confidence: 99%

A Superhydrophobic Self‐Cleaning and Anti‐Icing Aluminum Sheet Fabricated by Alkaline Solution

Zhang

Guo

et al. 2021

Adv Eng Mater

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Aluminum and its alloys are economical and applicable materials, which have the advantages of low density, good ductility, high specific strength, corrosion resistance, and strong electrical conductivity. [1][2][3][4][5][6][7] According to the advantages mentioned earlier, aluminum alloys have been used in aviation, aerospace, automotive, mechanical manufacturing, shipbuilding, chemical industry, and other fields. [8][9][10][11] However, most of these applications often have different performance requirements for aluminum alloys; it is highly meaningful to give special properties to the alloy surface according to the development conditions. [12,13] In particular, materials used in the aerospace field, which often work in harsh environments at high altitudes and low temperatures, need to improve self-cleaning, ice-repellent surface properties. [14][15][16][17] Therefore, it is very urgent to prepare a self-cleaning and ice-repelling superhydrophobic aluminum alloy material.Superhydrophobic surfaces, which have a contact angle greater than 150 and a sliding angle less than 10 , are fairly common in nature. [18][19][20][21] Superhydrophobic surfaces possess many excellent properties, such as self-cleaning, anticorrosion, an ice-phobic nature, and oil-water separation. [22] This kind of material has attracted the attention of many researchers, and the key steps to construct superhydrophobic surfaces is the establishment of a rough structure with a special micro-nano structure on the substrate, which has low surface energy. [23,24] Many methods have been developed to prepare a superhydrophobic aluminum alloy surface, such as anodic oxidation processing, microarc oxidation, laser cladding, fluorocarbon coating, and thermal spray treatment. [25][26][27][28][29][30] However, the shortcomings of high energy consumption and environmental contamination hinder those methods from large-scale applications.Besides the traditional methods, superhydrophobic aluminum materials, which are equipped with mechanical durability and anti-icing property, have been considered as appropriate candidates for the plane shell. [31][32][33][34][35] Recently, researchers have fabricated an enormous amount of superhydrophobic materials for mechanical durability improvement though Beck's etchant and demonstrated treatments such as rare-earth-salt-solution boiling bath method, sandblasting and chemical modification, and novel one-step hydrothermal method. [36][37][38] Kim et al. utilized Beck's etchant and demonstrated treatment to fabricate superhydrophobic micro-nano leave-like hierarchical structures for harsh environments' defense and self-cleaning properties. [39] Lei et al. fabricated superhydrophobic 7075 Al alloy with rare-earth-salt-solution boiling bath method to achieve robustness in harsh environments. [40] Sun et al. utilized sandblasting and chemical modification to fabricate a superhydrophobic aluminum surface for thermal stability and self-cleaning effect. [41] Tuo et al. prepared a superhydrophobic aluminum foil with novel one-step...

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Size Effects in Continuous Drive Friction Welded Spray‐Compacted Hypereutectic Al–Si Alloys

Feng

Wettlaufer

2017

Adv Eng Mater

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Spray-compacted hypereutectic Al-Si alloy is one of the most important lightweight materials for casting components in electric vehicles. Size effects in such alloys jointed by continuous drive friction welding have been investigated by connecting the interfacial microstructure with the joint strength. The nature of phases present, the topology, and the dispersion of particles have been examined carefully. The mechanical properties of joints have been characterized by transverse tensile tests, microhardness tests, XRD residual stress measurements, and finite element simulations. Size effects on the strengthening of the joint strength and the fracture of particles have been evaluated qualitatively and quantitatively. It has been confirmed that the micromechanical strengthening, which is related to the average particle size d and proportional to d À0.5 , and the residual stress together determine the joint strength. By means of the fracture-mechanical analysis, a lower and an upper limit of the particle size have been defined to assess whether a particle can be refined or not during continuous drive friction welding.

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Contribution to the Laser Welding of Wrought and Spray‐Compacted Aluminum Alloys and the Impact of the Alloy Composition on the Welding Microstructure

Cited by 6 publications

References 3 publications

Multiobjective Optimization of Laser Polishing of Additively Manufactured Ti-6Al-4V Parts for Minimum Surface Roughness and Heat-Affected Zone

Multiobjective Optimization of Laser Polishing of Additively Manufactured Ti-6Al-4V Parts for Minimum Surface Roughness and Heat-Affected Zone

A Superhydrophobic Self‐Cleaning and Anti‐Icing Aluminum Sheet Fabricated by Alkaline Solution

Size Effects in Continuous Drive Friction Welded Spray‐Compacted Hypereutectic Al–Si Alloys

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