Butt autogenous laser welding of AA 2024 aluminium alloy thin sheets with a Yb:YAG disk laser

Caiazzo, Fabrizia; Alfieri, Vittorio; Cardaropoli, Francesco; Sergi, Vincenzo

doi:10.1007/s00170-012-4637-7

Cited by 31 publications

(17 citation statements)

References 16 publications

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“…Backside shielding must be additionally provided to protect the root in fully penetrative welding; to this purpose, argon can be effectively used since no interaction results between the beam and back-side shielding flow. The scheme has been successfully tested to weld AA 2024 in different thickness samples in bead-on-plate, butt and overlapping configuration [16,22,25].…”

Section: Gas Assistancementioning

confidence: 99%

“…The need for proper gas assistance in laser welding of aluminium alloys has been widely discussed in several studies [16,22,23]. Gas flow impinging the laser focus has been suggested to blow the metal plume, while additional gas flux is required to prevent oxidation on the upper surface.…”

Section: Gas Assistancementioning

confidence: 99%

“…Therefore, the use of copper nozzles, which is a carryover from usual practice in welding steel, has also been suggested for aluminium [16]. Moreover, severe key-hole instability has been recognized to be reason of rough surface, macro-pores and hence bead rejection at quality checks [14,17]; precautions such as high frequency beam oscillation [18] and laser-arc hybrid devices [19,20,21] have hence been proposed in an attempt to improve process stability.…”

Section: Introductionmentioning

confidence: 98%

“…Since a number of experimental plans have been developed by the authors to optimize aluminium welding both on 3.2 mm thick plates (i.e., 0.125 in) and 1.25 mm thick sheets (i.e., 0.05 in) in terms of imperfections and extent of the fused zone [16,22], general issues influencing autogenous weldability of AA 2024 have been gradually found and investigated. A comprehensive review of these is given in this paper: ad-hoc trials with Yb:YAG disk-laser source and existing knowledge as available in the referred literature are combined.…”

Section: Introductionmentioning

confidence: 99%

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Autogenous Laser Welding of AA 2024 Aluminium Alloy: Process Issues and Bead Features

2015

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Laser welding has been proven to be promising for aerospace. Welds with high aspect ratio are produced with lower heat input compared with conventional arc-welding processes; furthermore, higher productivity and lower distortion are benefited. Nevertheless, specific issues must be addressed depending on the material to be welded. In this frame, laser welding of AA 2024 in T3 heat treatment condition, which is among the most common light metal alloys in aerospace, is discussed. A comprehensive review of issues influencing weldability is given, combining ad-hoc trials with Yb:YAG disk-laser source and existing knowledge in the referred literature. Therefore, a number of subjects are investigated: the need for proper gas assistance, the threshold value of irradiance to be overcome for key-holing as a consequence of low absorptance and high conductivity, magnesium vaporization leading to instability and macro-pore formation, softening in the fused zone resulting in lower strength due to dissolution of precipitates and loss of the strengthening phase. EDS inspections, Vickers micro-hardness tests and tensile tests have been conducted to discuss the response. Convincing results have been achieved both in terms of reduction of the heat affected zone and ultimate tensile strength, in comparison with other findings in the literature.

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Section: Gas Assistancementioning

confidence: 99%

Section: Gas Assistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Autogenous Laser Welding of AA 2024 Aluminium Alloy: Process Issues and Bead Features

2015

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“…As the main strengthening element, burning loss of magnesium reduces the mechanical properties of weld joint. As a consequence, study of the burning loss of magnesium in laser welding of aluminum alloy has great significance in improving the performance of weld joint [9][10][11][12][13]. Blake et al [9] demonstrated that magnesium loss could be minimized by manipulation of experimental variables and control of plasma via a specially designed inert gas shield.…”

Section: Introductionmentioning

confidence: 99%

Study on the burning loss of magnesium in fiber laser welding of an Al-Mg alloy by optical emission spectroscopy

Zhou

Zhang

Jin

et al. 2016

Int J Adv Manuf Technol

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In order to study the burning loss of magnesium, a specially designed device was used to capture the spectrum emitted from the keyhole plasma in deep penetration laser welding of aluminum alloy 5052. The content of magnesium in the weld bead was measured by an electron probe microanalyzer (EPMA). The effect of the welding parameters on the spectral intensity of magnesium plasma was examined, and the distributions of the spectral intensity of magnesium plasma in the radial and depth directions of the keyhole were investigated. Finally, the mechanism of the magnesium loss was analyzed. The results indicate that burning loss of magnesium can be monitored by spectral analysis technique. The welding parameters have a great effect on the burning loss of magnesium. The influence of welding speed on the burning loss of magnesium on the top surface is dependent on the penetration regime. The distribution of magnesium in the weld is not uniform. In the radial direction of the weld bead, the content of magnesium increases from the center to the edge of the keyhole. In the depth direction of the weld bead, the content of magnesium decreases firstly and then increases from the top to bottom. The maximum burning loss of magnesium occurs at the middle of the weld bead.

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High-Speed Conduction-Mode Micro-Laser Welding of Thin SS-304 Sheets: Modeling and Experimental Validation

Patel

Aggrawal

Kumar

et al. 2019

Lecture Notes on Multidisciplinary Industrial Engineering

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Butt autogenous laser welding of AA 2024 aluminium alloy thin sheets with a Yb:YAG disk laser

Cited by 31 publications

References 16 publications

Autogenous Laser Welding of AA 2024 Aluminium Alloy: Process Issues and Bead Features

Autogenous Laser Welding of AA 2024 Aluminium Alloy: Process Issues and Bead Features

Study on the burning loss of magnesium in fiber laser welding of an Al-Mg alloy by optical emission spectroscopy

High-Speed Conduction-Mode Micro-Laser Welding of Thin SS-304 Sheets: Modeling and Experimental Validation

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