Developer Effects of Pre-Heating Applied to the Al7039 Armor Plates Prior to the Friction Stir Welding

Avci, Uğur; Temiz, Şemsettın

doi:10.31202/ecjse.423855

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…These cracks, known as solidi cation cracks, were caused by the high heat input and progressed from the seam surface to the center depending on the cooling rate (residual stresses) [25,26]. During the welding process, the initial region of the weld line is exposed to continuous heat input (post-heating) and therefore the cooling rate along the weld line is low [27]. The continuous heat input and slow cooling created a wider and more downwardly directed seam compared to other weld lines.…”

Section: Weld Geometry and Microstructurementioning

confidence: 99%

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

AVCI,

Franciosa

2024

Preprint

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The advancement of technology has led to an increased need for new materials, which has necessitated the development of new joining techniques. With the adaptation of advanced automation technology, remote laser welding, which has become increasingly widespread, has facilitated the joining of desired complex structures. In this context, the determination of the laser beam power, which is the locomotive of the welding parameters, before the joining process has played an important role in the weld quality. In this study, 2 mm thick AA6082 plates were joined with a wobling mode remote laser welding system using 4 kW, 3 kW and 2.5 kW laser beam powers. Except for the laser beam power, other parameters were optimized by preliminary studies. The welding process was performed in circular oscillation mode and the time-dependent motion of the laser beam was calculated in advance. The seam geometry, microstructure and hardness properties of the weld line initial, middle and end regions of each joining plate were investigated. As a result of the investigations, full penetration was achieved in the joints made with 4 kW and 3 kW laser powers, but the use of 4kW laser power reduced the weld quality. As a result of using 2.5 kw laser power, full penetration was not achieved and porosity formations were observed. In addition, seam geometry values, HAZ distance and compound dimensions close to the fusion line decreased and weld zone element values changed with decreasing laser power. The transformation in structural and elemental values caused regional hardness changes.

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Section: Weld Geometry and Microstructurementioning

confidence: 99%

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

AVCI,

Franciosa

2024

Preprint

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Effect of laser power on weld microstructure of AA6082 sheets remote laser welded by circular beam wobbling

Avci,

Franciosa

2024

Weld World

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This paper aims to investigate the combined effect of circular beam wobbling and varying laser power on crack formation, weld geometry, microstructure and hardness during remote laser welding of AA6082 alloy. AA6082 sheets of 2 mm thickness were joined in overlap weld configuration using wobbling mode remote laser welding at 4 kW, 3 kW and 2.5 kW. Full penetration was achieved in the joints made at 4 kW and 3 kW, with severe crack formation. Welds at 2.5 kW showed partial penetration and no cracks; however, porosity formation was observed. While no significant change was observed in the dendritic structure and compound contents in fusion zones with full penetration, compound clusters dominated by Cu and Si elements were revealed in the seam root region at 2.5 kW (partial penetration). In full penetration welds (4 and 3 kW), the hardness decreased in the center of the fusion zone but increased from the surface to the root zone. However, for the partial penetration weld (2.5 kW), a limited change in the hardness values determined in the same direction was observed.

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Manufacturing and FSW of hybrid functionally graded metal matrix composite

Avci

Temiz

2022

Materials Testing

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This study focuses on the manufacturing of hybrid functionally graded metal matrix composite (HFGMMC) using Al7039 alloy matrix phase which is used as armor material in today’s world. In this context, manufacturing stages of matrix material were analyzed, and necessary parameters were determined for remanufacturing using casting method. With the determined parameters, the matrix material was reinforced by SiC, Al2O3, and B4C particles in different volume rates at an average size of 3–10 µm using stir casting method. Three metal matrix composite (MMC) plates which were manufactured using different reinforcement particles in different volume rates were joined as semi-solid with the effect of temperature and pressure in a specially designed mold. In order to complete the manufacturing process, hot forging, and heat treatment were applied to the manufactured composite plate in accordance with the parameters determined in the manufacturing of the matrix. The manufactured MMC and HFGMMC plates were compared in terms of their micro structure, micro hardness, tensile strength, and wear behavior. Finally, HFGMMC plates were joined together by friction stir welding (FSW) in order to analyze their micro structures and mechanical properties after welding.

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Developer Effects of Pre-Heating Applied to the Al7039 Armor Plates Prior to the Friction Stir Welding

Cited by 3 publications

References 18 publications

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

Effect of Laser Beam Power on AA6082 Plates Joined by Wobbling Mode Remote Laser Welding

Effect of laser power on weld microstructure of AA6082 sheets remote laser welded by circular beam wobbling

Manufacturing and FSW of hybrid functionally graded metal matrix composite

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