Investigation on edge joints of Inconel 625 sheets processed with laser welding

Alfieri, Vittorio; Cardaropoli, Francesco; Sergi, Vincenzo

doi:10.1016/j.optlastec.2017.03.011

Cited by 38 publications

(14 citation statements)

References 14 publications

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“…3) has been developed for inert shielding of both the melted pool and the metal during solidification as a carryover of a prior patented device for welding [24]: two separate inert supplies have been required in this work, an aluminum tunnel-shaped skid (Fig. 4) [25] supplying helium at a constant flow rate of 9 L/ min, atmospheric pressure over the deposited metal, in conjunction with a copper pipe, 2 mm diameter, supplying argon at a constant flow rate of 16 L/min, atmospheric pressure, to specifically shield the melting pool where metal wire is fed and fused by the laser beam. Although argon would be preferred in an industrial environment thanks to reduced costs, the reported metal required stronger shielding action; hence, helium has been supplied via the skid, whereas argon shielding was proved to be effective for the melted pool.…”

Section: Methodsmentioning

confidence: 99%

Additive manufacturing by means of laser-aided directed metal deposition of titanium wire

Caiazzo

2018

Int J Adv Manuf Technol

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A number of innovative technologies are offered in the literature to the purpose of additive manufacturing. Among them, directed metal deposition of wire by means of laser beam is receiving increasing interest since important advantages are benefited in comparison with its powder-based counterpart. Nevertheless, a number of issues must be addressed: this paper aims to provide further understanding of the technology to give grounds to actual applications in an industrial environment. Single trace deposition of Ti-6Al-4V wire over homologous substrate is investigated; the laser power, the processing speed, and the amount of fed metal is changed. The geometrical responses (i.e., trace width, height, depth, shape angle, and dilution) in the cross-section are investigated as a function of the processing parameters. Namely, a global clear view of the responses is given as a function of power and deposited wire mass per unit time. Furthermore, possible occurrence of micro pores is discussed with respect to common international standards. Eventually, an investigation about changes in both the microstructure and the microhardness is addressed: an increase of hardness in the fusion zone is noticed as a consequence of non-diffusional martensitic transformation of the original α-β phases upon rapid cooling, with reduced extent of the heat-affected zone below 0.4 mm.

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Section: Methodsmentioning

confidence: 99%

Additive manufacturing by means of laser-aided directed metal deposition of titanium wire

Caiazzo

2018

Int J Adv Manuf Technol

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“…The laser welding process is easily automated [1,2], and it is generally done with an automated process. The automation raises challenges in the process, as it needs to be precongured and programmed.…”

Section: Characteristics Of Laser Weldingmentioning

confidence: 99%

“…The demand for laser welding is rising in the industry, and thus, research concerning optimisation, simulation and the fatigue behaviour of laser welding has been an object of interest. The main benets of laser welding can be exploited in joints, such as the lap joint, where laser welding can be used as "continuous spot welding", as this welding process is easy to control [1,2]. The lap joint can be made by welding through from one side, making a complete seam with one pass, which provides many opportunities for the design of lightweight structures [35].…”

Section: Introductionmentioning

confidence: 99%

Overview of laser-welded thin-walled joints fatigue performance and a statistical method for defect analysis

Kokko

Vaara

Kuivaniemi

et al. 2020

RakMek

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Welding always has a deteriorating effect on fatigue strength in structures under dynamic loading. Weld joints induce discontinuity in structure geometry and the microstructure. Welding induced discontinuity, and defects allow for potential fatigue cracks that lead to the failure of welded parts or structures. The laser welding process differs from conventional arc welding in process and joint type. The most significant advantage in laser welding comes from the deep penetrating mode of welding, which also brings challenges to the soundness of the weld. The benefits of laser welding are most evident in the manufacture of sheet metal products such as sandwich panels. In literature, laser welding is generally dealt with by using different parts of the overall process without taking the fatigue point of view into account. In this article, the process of laser welding is discussed, while keeping fatigue strength in perspective. The fatigue data of laser welded joints is studied in order to find defect distribution that explains fatigue strength distribution in tests. The suitability of traditional fatigue assessment for laser welding is also discussed.

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“…Laser welding of titanium alloys is therefore attracting increasing interest as an alternative to traditional joining techniques for industrial applications [ 2 ]. The particular advantages of this process, compared to a TIG (Tungsten Inert Gas) or plasma arc welding, include an increased depth of penetration, a decrease of possible welding defects, and reduction of the melted and heat-affected zone [ 3 ], thus entailing an enhancement of the mechanical performance of the welded structures [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

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

Caggiano

2018

Materials

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Laser welding of titanium alloys is attracting increasing interest as an alternative to traditional joining techniques for industrial applications, with particular reference to the aerospace sector, where welded assemblies allow for the reduction of the buy-to-fly ratio, compared to other traditional mechanical joining techniques. In this research work, an investigation on laser welding of Ti–6Al–4V alloy plates is carried out through an experimental testing campaign, under different process conditions, in order to perform a characterization of the produced weld bead geometry, with the final aim of developing a cognitive methodology able to support decision-making about the selection of the suitable laser welding process parameters. The methodology is based on the employment of artificial neural networks able to identify correlations between the laser welding process parameters, with particular reference to the laser power, welding speed and defocusing distance, and the weld bead geometric features, on the basis of the collected experimental data.

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Investigation on edge joints of Inconel 625 sheets processed with laser welding

Cited by 38 publications

References 14 publications

Additive manufacturing by means of laser-aided directed metal deposition of titanium wire

Additive manufacturing by means of laser-aided directed metal deposition of titanium wire

Overview of laser-welded thin-walled joints fatigue performance and a statistical method for defect analysis

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

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