Dissimilar Laser Welding of NiTi Wires

Mehrpouya, Mehrshad; Gisario, Annamaria; Barletta, Massimiliano; Natali, S.; Veniali, F.

doi:10.1007/s40516-019-00084-0

Cited by 16 publications

(4 citation statements)

References 33 publications

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“…However, large differences in the melting temperatures, thermal conductivities, and thermal expansions of steel and aluminum, as well as low solubility, makes it quite difficult to join them. A variety of methods have been applied to join dissimilar materials, such as mechanical assembling (e.g., riveting, clinching, screwing) and heat joining (e.g., friction stir welding [1,2], arc welding [3,4], laser welding [5][6][7][8][9], hot-dip aluminizing [10]).…”

Section: Introductionmentioning

confidence: 99%

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

2019

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Combining aluminum and steel is a major goal of automobile manufacturers and other industries because the hybrid material reduces the weight of components. However, differences in chemical properties, thermal expansion, and physical characteristics of aluminum and steel are barriers to achieving this goal. In this article, selective laser melting (SLM), which is widely used in industrial fields, was applied to join dissimilar materials by printing aluminum on a steel substrate. Defects of joining during the SLM process, characteristics of the intermetallic reaction layer, and the effects of the process parameters were investigated. The analysis indicates that flake behavior could affect the quality of joining. The phases of the intermetallic layer found in this study were in agreement with other research, but the morphology of the layer was much different. A formula to estimate the join quality in terms of density energy is proposed. The results indicate that the SLM process is a promising method to manufacture a hybrid material.

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Section: Introductionmentioning

confidence: 99%

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

2019

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“…Various methods are used to join dissimilar materials in bimetallic joints, such as thermal bonding due to mechanical action (friction stir welding [3,4]) or heat-source direct action (arc welding [5,6], laser welding [7][8][9][10][11], and hot aluminizing [12]). The cold welding or cladding techniques are used for the manufacturing of bimetallic sheet materials by covering the parts surfaces with a uniform layer of another metal through strong compression and plastic deformation [13].…”

Section: Introductionmentioning

confidence: 99%

Interface Quality Indices of Al–10Si–Mg Aluminum Alloy and Cr18–Ni10–Ti Stainless-Steel Bimetal Fabricated via Selective Laser Melting

Khaimovich

Erisov

Смелов

et al. 2021

Metals

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Bimetallic materials are important in many industries (aerospace, medicine, etc.) since they allow the creation of constructions that combine specific functional properties, for example, low density (aluminum alloy) and high corrosion resistance (stainless steel), due to layering fabrication of the bimetallic joint. On the other hand, the difference in thermophysical properties of the dissimilar material layers leads to residual stresses, which cause deformation and destruction of such a bimetallic joint produced via the methods of surfacing or additive technologies. This article discusses the methods based on the gray relational analysis and generalized desirability function for the quality assessment of Al–10Si–Mg aluminum alloy and Cr18–Ni10–Ti stainless-steel bimetal fabricated via selective laser melting (SLM). There are four main parameters (quality indices) of the quality generalized assessment, which determine the degree of Al penetration into the steel substrate and Fe into the deposited layer, the difference in microhardness values on both sides of the interface boundary, and the resistance to mechanical destruction of the bimetallic joint. According to the results obtained, the best set of quality indices corresponds to the SLM technological modes with an energy density of 105 and 147 J/mm3. The greatest functionality of the bimetals is determined by the quality index associated with its strength. Therefore, methods of gray relational analysis and desirability function make it possible to form a generalized assessment for the bimetallic joint quality and, consequently, to select the best technological mode.

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“…[4][5][6] Nowadays, to further expand the potential applications of NiTi SMAs, it is necessary to develop joining methods with high efficiency and reliability owing to the difficulty in machining these materials. Different joining techniques such as laser [7][8][9][10] and electron beam welding [11] have been applied to obtain complex welding structures based on NiTi. However, traditional fusion welding methods give rise to the occurrence of potentially brittle intermetallic compounds and significantly influence the phase transformation behavior in the welded region.…”

Section: Introductionmentioning

confidence: 99%

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

Zhang

et al. 2020

Materials and Manufacturing Processes

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NiTi thin sheets were ultrasonic spot welded with a Cu interlayer, where different welding vibration amplitudes were applied to study the influence on the surface and interface microstructural characteristics, phase transformation behavior and mechanical response of the joints, which aimed to enhance the joint performance by proper optimization of the process parameters. An excellent bonding interface was achieved when an optimized vibration amplitude was applied, with a recrystallized microstructure formed in the Cu foil side near the bonding interface, which helped to improve the mechanical performance of the joints. Joints made with vibration amplitude of 55 μm had an improved strength compared to the NiTi base material.

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Dissimilar Laser Welding of NiTi Wires

Cited by 16 publications

References 33 publications

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

Applying Selective Laser Melting to Join Al and Fe: An Investigation of Dissimilar Materials

Interface Quality Indices of Al–10Si–Mg Aluminum Alloy and Cr18–Ni10–Ti Stainless-Steel Bimetal Fabricated via Selective Laser Melting

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

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