The investigation of molten pool dynamic behaviors during the “∞” shaped oscillating laser welding of aluminum alloy

Ai, Yuewei; Yu, Lihua; Yi, Huang; Liu, Xiaoying

doi:10.1016/j.ijthermalsci.2021.107350

Cited by 67 publications

(21 citation statements)

References 33 publications

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“…Several studies have been conducted on alloying elements, as well as the effect of cooling rate and texture on weld toughness, but basic research on cryogenic welding steel developed to date and welding conditions, such as in relation to high efficiency and high adhesion, is lacking. In line with the recent increase in demand for 9% Ni steel used to produce LNG storage tanks, basic research on the possibility of brittle fracture due to excessive welding heat input is required [17,18].…”

Section: Brittle Fracture Behaviormentioning

confidence: 99%

A Study on Heat Input Control and a Quality Evaluation Algorithm to Prevent Toughness Deterioration of the Heat-Affected Zone in the Fiber Laser Welding Process of ASTM A553-1 (9% Nickel Steel) Material

Park

Kim

Pyo

2022

Metals

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Various international organizations and governments of many countries are making efforts to prevent environmental pollution, with the IMO (International Maritime Organization) reinforcing related regulations. With these regulations, equipment related to LNG-fueled ships, which have the greatest carbon dioxide reduction effect among eco-friendly ships, are expected to increase. Although the IGC code designates the materials that can be used for LNG containers, such as 304L stainless steel and 9% nickel steel, these materials have a tendency to deteriorate the tissue around the heat-affected zone due to excessive heat input. In this study, we analyzed the effect of brittle fracture in the weld zone and heat-affected zone after fiber laser welding and found that welding quality improved with control of the heat input. SVM discriminant analysis was applied to classify the groups in which brittle fracture and ductile fracture occurred. The shape of the penetration section, hardness in the welding zone and heat-affected zone, and fracture surface were selected as factors for discrimination; these values were determined under various welding conditions. With these data, we derived a regression model and multi-objective optimization algorithm to predict mechanical properties after welding, as well as the conditions necessary to prevent brittle fracture. Finally, the prediction models were verified, as the results of welding under the derived conditions were classified as ductile fracture group.

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Section: Brittle Fracture Behaviormentioning

confidence: 99%

A Study on Heat Input Control and a Quality Evaluation Algorithm to Prevent Toughness Deterioration of the Heat-Affected Zone in the Fiber Laser Welding Process of ASTM A553-1 (9% Nickel Steel) Material

Park

Kim

Pyo

2022

Metals

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“…Laser welding, with advantages such as low heat input, fast welding speed, and minimal post-weld deformation, has been widely applied. In recent years, research has shown that the beam oscillation generated by mirror scanning systems can increase the tolerance of assembly errors, reduce welding cracks 4,5 , and improve the convection of the molten pool, thereby enhancing the formation of laser-welded seams in medium-thick plates, refining weld grain structures, and reducing porosity in aluminum alloy welding [6][7][8][9][10] . Currently, laser oscillating scanning welding (LOSW) is mostly used for aluminum alloy welding, with limited applications in stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Research on weld formation of SUS 304 stainless steel by laser oscillating scanning welding

Tang,

Aday

2024

Third International Conference on Advanced Manufacturing Technology and Electronic Information (AMTEI 2023)

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In order to investigate the underlying mechanism of how process parameters in galvanometer-scanned laser welding affect weld formation, the galvanometer-scanned laser welding technology was applied to SUS304 stainless steel under different oscillating frequency and amplitude. The finite element analysis was used to predict the effect of oscillation parameters on the temperature field of SUS304 stainless steel weld joint. The results indicate that compared to conventional laser welding, laser oscillating scanning welding significantly improved the quality of weld formation and suppressed defects such as burn-through, undercut and overlap. With the increase of scanning amplitude or scanning frequency, the weld forming quality is improved. However, with the further increase of scanning amplitude or frequency, undercut defects will occur on the front side of the weld, and spatter/overlap defects will occur on the back side of the weld. This is because laser oscillating scanning welding changes the energy deposition path; The simulated temperature field is in good agreement with the actual weld geometry. Compared with conventional laser welding, laser oscillating scanning welding reduces the peak temperature and temperature gradient in the welding process.

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“…Although many methods have been developed to join aluminium with aluminium and aluminium with Fe-based alloys, such as rolling [33], riveting [34], conventional laser welding [35,36], high-speed fibre laser welding [37], oscillating laser welding [38] and friction stir welding [39,40] it is hard to claim that these methods are easy to implement when joining elements with complex-shaped components [41]. The casting process, by means of which liquid metals can be joined with solid metals in the metallurgical process, has great flexibility when joining elements with complex shapes [42].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Duration and Temperature of the Al-Fin Process for the Cast Iron Insert on the Microstructure of the Bimetallic Joint Obtained in the Piston Casting Process

Szwajka

Zielińska-Szwajka

Trzepieciński

2023

Metals

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The aim of this work was to determine the effect of the duration and temperature of the Al-Fin process for casting the bimetallic joint on the formation of the metallurgical bond between the AlSi9 aluminium alloy piston and the cast iron insert. Knowledge about the formation of individual bonding layers has a direct impact on the bonding strength between the aluminium alloy and the EN-GJLA-XNiCuCr15-6-2 austenitic cast iron ring. In the performed tests, the Al-Fin casting process was carried out for different temperatures of the liquid AlSi9 alloy. The temperature of the AlSi9 aluminium alloy varied in the range 700–950 °C in steps of 50 °C. The duration of the Al-Fin process ranged from 1 to 10 min. An optical microscope and a scanning electron microscope were used to study the microstructure of the bimetallic joints. The analysis of the microstructure of the bimetallic bond showed that characteristic layers are formed between the aluminium alloy piston and the cast iron insert: a transition layer, in which iron and aluminium atoms from both joined materials are mixed, and a diffusion layer, in which aluminium and silicon atoms penetrate the surface layer of the joined metals. The thickness of the intermetallic diffusion layer formed between the aluminium alloy and the cast iron insert is thinner and does not depend on the heating time of the aluminium insert in the bath. However, there is a significant effect of both the annealing time and the temperature of the AlSi9 aluminium alloy on the thickness of the transition zone.

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The investigation of molten pool dynamic behaviors during the “∞” shaped oscillating laser welding of aluminum alloy

Cited by 67 publications

References 33 publications

A Study on Heat Input Control and a Quality Evaluation Algorithm to Prevent Toughness Deterioration of the Heat-Affected Zone in the Fiber Laser Welding Process of ASTM A553-1 (9% Nickel Steel) Material

A Study on Heat Input Control and a Quality Evaluation Algorithm to Prevent Toughness Deterioration of the Heat-Affected Zone in the Fiber Laser Welding Process of ASTM A553-1 (9% Nickel Steel) Material

Research on weld formation of SUS 304 stainless steel by laser oscillating scanning welding

Influence of the Duration and Temperature of the Al-Fin Process for the Cast Iron Insert on the Microstructure of the Bimetallic Joint Obtained in the Piston Casting Process

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