Double-sided fiber laser beam welding process of T-joints for aluminum aircraft fuselage panels: Filler wire melting behavior, process stability, and their effects on porosity defects

Wang, Tao; Yang, Zhibin; Chen, Yanbin; Li, Liqun; Jiang, Zhenguo; Zhang, Yunlong

doi:10.1016/j.optlastec.2013.04.003

Cited by 67 publications

(12 citation statements)

References 16 publications

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“…It was found that the computed weld pool geometry and dimensions agreed well with the experimental results, which indicated the numerical model proposed in this research reasonably simulated the double-sided laser welding process for the T-joint. The certain discrepancies between the simulated and experimental results were mainly caused by the simplifications and assumptions made in the proposed model, especially without considering the influence of the wire feeding into the weld molten pool, which resulted in the loss of the wire feeding impact [29,30].…”

Section: Model Verificationmentioning

confidence: 96%

“…The constant thermal and physical properties of the base material are listed in Table 2. The specific heat capacity, heat conductivity and viscosity are temperature dependent, which are from the experimental measurement and literature [15,27] and can be calculated by formulas (27)- (29). The thermal and physical properties of the laser-induced plasma in the keyhole are given in Table 3.…”

Section: Materials Propertiesmentioning

confidence: 99%

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Numerical modelling and experimental verification of thermal characteristics and their correlations with mechanical properties of double-sided laser welded T-joint

Yang

Wang

Zhao³

et al. 2017

Int J Adv Manuf Technol

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In this study, a three-dimensional model was developed to investigate the temperature fields during a doublesided laser welding process of T-joints, and the correlations between the thermal characteristics and the mechanical properties were researched in details. To verify the modelling results, welding experiments were conducted with two different welding parameters and the geometrical dimensions of the weld pool were measured. It was found that there was a good agreement between the calculated and the measured results. The calculated results showed that the temperature profile was bilateral symmetry along the stringer centre, and the temperature gradient became greater as running far from the stringer centre, especially on the skin side. All of the tensile specimens were fractured along the fusion line on the skin panels for the head and the hoop tensile tests. The loss of the alloying elements near the fusion line on the skin side resulted in the lowest micro-hardness value appeared here, and made it to be the weakest region of the welded T-joints. The calculated thermal cycles indicated that the materials closest to the fusion line on the skin side had been staying at higher temperature for a longer time, and which is the essential reason for the fracture behaviour, micro-hardness distribution and alloying elements distribution of the double-sided laser welded T-joint.

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Section: Model Verificationmentioning

confidence: 96%

Section: Materials Propertiesmentioning

confidence: 99%

Numerical modelling and experimental verification of thermal characteristics and their correlations with mechanical properties of double-sided laser welded T-joint

Yang

Wang

Zhao³

et al. 2017

Int J Adv Manuf Technol

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“…Several studies have reported that a filler material has been used during laser welding to fill the gap existing at the joint or improved the weld bead quality [19 -23]. However, laser welding with filler wire may lead to extra costs and some additional difficulties for industrial application, having many parameters and stringent requirements for wire positioning [19,24,25]. Therefore, the weld quality of laser welded joints needs to be improved without using filler metal.…”

Section: Introduction mentioning

confidence: 99%

A Comparison of Tensile Properties of Single-Sided and Double-Sided Laser Welded DP600 Steel Sheets

Tunçel

Aydın

2019

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Dual Phase (DP) steels are the most commonly used steels in the automotive industry to reduce vehicle weight and improve car safety. DP600 steel is one of the most used steels for the automotive industry because this steel has high strength and good elongation properties. During the manufacture of automotive parts, welding is the most commonly used joining process, and especially the laser welding is getting more and more importance. This study was executed to evaluate how the welding type (single-sided and double-sided) affects the tensile properties of Nd:YAG (Neodymium-Doped Yttrium Aluminum Garnet; Nd:Y3Al5O12) laser welded DP600 steel sheets using different pulse frequencies. The laser welded samples were investigated by the methods of tensile test and fractography. Experimental results indicated that the tensile properties varied significantly depending on the welding type and pulse frequency. The tensile properties of the double-sided laser welded joints were significantly higher than those of the single-sided laser welded joints. Tensile strength and elongation of the single-sided and the double-sided laser welded joints increased almost linearly with increasing pulse frequency. The higher pulse frequency resulted in larger fully bonded section size, which led to higher tensile properties. The maximum tensile strength and elongation (611 MPa and 10.06 %) were obtained with the double-sided laser welded joint in the pulse frequency of 8.5 Hz. The tensile strength of this joint was almost equal to that of the base metal, but its elongation value was lower that of the base metal.

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“…5,6 Up to the present day, the DLBSW technology has only been successfully applied to the lower fuselage areas of several types of aircraft produced by Airbus, such as Airbus A318, Airbus A340, Airbus 380, and so on, and proved to be a promising technology in terms of weight saving and efficiency improvement. 8,9…”

Section: Introductionmentioning

confidence: 99%

Fracture mechanism on Al-Li alloy T-joint welded by dual laser-beam bilateral synchronous welding

Zhan

Xia

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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Dual laser-beam bilateral synchronous welding technique is considered to replace riveting in terms of skin–stringer joints. The 2.0-mm thick Al-Li alloy T-joint, which is welded by dual laser-beam bilateral synchronous welding between 2099-T83 stringer and 2060-T8 skin, is investigated in the current study. Under the tailored process conditions, the examinations and analyses of microstructures, microhardness distribution, hoop tensile mechanical properties, and fractographies of the T-joint are conducted. Experimental results show that the maximum tensile strength of the weld seam is up to 85% of the tensile strength of the skin material. In order to explore the special fracture characteristics of dual laser-beam bilateral synchronous welding joints after tensile test, a three-dimensional finite element model is established and the residual stress of the weldment is analyzed. Considering the scanning electron microscopy results and simulation results comprehensively, stress concentration is the main reason for the weldment failure in tensile test.

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Double-sided fiber laser beam welding process of T-joints for aluminum aircraft fuselage panels: Filler wire melting behavior, process stability, and their effects on porosity defects

Cited by 67 publications

References 16 publications

Numerical modelling and experimental verification of thermal characteristics and their correlations with mechanical properties of double-sided laser welded T-joint

Numerical modelling and experimental verification of thermal characteristics and their correlations with mechanical properties of double-sided laser welded T-joint

A Comparison of Tensile Properties of Single-Sided and Double-Sided Laser Welded DP600 Steel Sheets

Fracture mechanism on Al-Li alloy T-joint welded by dual laser-beam bilateral synchronous welding

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