Study on Improving Surface Quality of Weld of Autogenously Laser Welding of Thick Plate with High Power Fiber Laser

Genyu, 陈根余 Chen; Yu, 周宇 Zhou; Mingjun, 张明军 Zhang; Xiaofeng, 陈晓锋 Chen; Shenghui, 廖生慧 Liao

doi:10.3788/cjl201340.1103011

Cited by 3 publications

(1 citation statement)

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“…During the welding process, the flow of liquid metal on the surface of the molten pool and the inside constantly stirs the molten pool, causing the material at the bottom of the molten pool to be continuously carried to the upper part of the molten pool. 13) In addition, the temperature gradient of the upper plate is smaller than that of the under during the welding process, leading to the grains coarsening. All of the three factors have come together to make the hardness increases in the direction of penetration.…”

Section: Hardnessmentioning

confidence: 99%

Microstructure and Mechanical Properties of Laser Welded Al–Mg–Si Alloy Joints

Yang

Duan

et al. 2019

Mater. Trans.

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In this paper, AlMgSi alloy with the thickness of 2.5 mm was overlap welded by fiber laser. Optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, hardness tester, and electro-hydraulic servo testing machine were used for the microstructure observation and mechanical property examination. Specimens extracted from the welded plates were tested at room temperature for the determination of the tensile and fatigue properties of the welded joints. Results showed the columnar grains were formed in the fusion boundary, while equiaxed grains were formed in the fusion zone; the lowest hardness in the fusion zone is 72.0 HV, gradually increasing from the heataffected zone to the BM. Tensile shear strength of the welded joint is 96.0 Mpa, which is about 25% of the tensile strength of base metal. The fatigue limit at 1 © 10 6 conditional cycles is 22.5 MPa. The fractography showed intergranular and quasi-cleavage fracture. Bending deformation is related to the magnitude of the force. As the stress lower, the deformation become more severe.

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Section: Hardnessmentioning

confidence: 99%

Microstructure and Mechanical Properties of Laser Welded Al–Mg–Si Alloy Joints

Yang

Duan

et al. 2019

Mater. Trans.

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The effect of welded joint properties on the surface characteristics of laser-welded 2205 duplex stainless steel

Zheng

Zhao

et al. 2018

Advances in Mechanical Engineering

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Welded joints of poor welding surface quality are sensitive to stress concentrations, affecting both the tensile strength of workpieces and the fluidity of liquids and gases in pressure and liquid containers. Orthogonal experiments involving the laser welding of 1-mm-thick duplex stainless steel sheets were conducted using different electric current, pulse width and frequency values in order to analyse the effect of welding properties on the surface characteristics of the welded joints. Rapid judgement regarding the welded joint properties was made based on the observed welding surface quality. The results show that an even phase proportion and grain refinement are not necessarily guaranteed to provide good welding surface quality. A satisfactory welding surface quality characterised by a smaller spot pitch or spot pitch difference, smaller weld width, reduced surface roughness and valley depth of surface waviness implies better welded joint mechanical characteristics and a more even microstructure. The specimen with the most suitable welding parameters and the greatest heat input can reach the lowest volume fraction of ferrite phase of 42.5% and the highest tensile strength of 848 MPa, and its surface quality is the best.

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Melting behavior in ultrasonic-assisted narrow-gap laser welding with filler wire

Chen

Zhao

et al. 2021

Journal of Laser Applications

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The performance of ultrasonic-assisted laser welding with filler wire was investigated using high-speed imaging and a mechanical analysis of the droplet. The present study demonstrated that the droplet transition was influenced by the distance between the ultrasonic-assisted position and the weld. Due to ultrasonic assistance and plasma and metal vapor injection, the droplet was blown away and not directly above the keyhole such that the shielding and the absorption of the laser were minimal. The weld pool received direct laser irradiation for a long period. The weld depth increased by 27.2%, while the width difference was not significant when the distance between the ultrasonic-assisted position and the weld center (DUL) was 10 mm. As the DUL increased to 20 mm, the weld was formed well, and the pores were significantly reduced. With increasing the DUL, the effect of ultrasound on the weld pool became weak. Also, the droplet transition did not significantly differ from that without ultrasound, when the distance was 30 mm.

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Study on Improving Surface Quality of Weld of Autogenously Laser Welding of Thick Plate with High Power Fiber Laser

Cited by 3 publications

References 0 publications

Microstructure and Mechanical Properties of Laser Welded Al–Mg–Si Alloy Joints

Microstructure and Mechanical Properties of Laser Welded Al–Mg–Si Alloy Joints

The effect of welded joint properties on the surface characteristics of laser-welded 2205 duplex stainless steel

Melting behavior in ultrasonic-assisted narrow-gap laser welding with filler wire

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