Laser Beam Welding of Hard to Weld Al Alloys for a Regional Aircraft Fuselage Design – First Results

Dittrich, Dirk; Standfuß, Jens; Liebscher, Jens; Brenner, Berndt; Beyer, Eckhard

doi:10.1016/j.phpro.2011.03.015

Cited by 94 publications

(34 citation statements)

References 2 publications

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“…In addition, cavity-free welds can be realized with high reliability enhancing the mechanical strength of the joint [70]. Especially welding of high-strength Al alloys, containing Cu or Li, is a key technology in modern manufacturing engineering [71] since lightweight constructions more and more replace heavier steel and riveted joint constructions [71,72]. Therefore, in order to avoid deterioration of the mechanical properties it is of particular interest to produce high-strength welds with low defect concentration.…”

Section: Laser Beam Welding (Lbw)mentioning

confidence: 99%

Defect imaging and detection of precipitates using a new scanning positron microbeam

et al. 2017

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We report on a newly developed scanning positron microbeam based on threefold moderation of positrons provided by the high intensity positron source NEPOMUC. For brightness enhancement a remoderation unit with a 100 nm thin Ni(100) foil and 9.6% efficiency is applied to reduce the area of the beam spot by a factor of 60. In this way, defect spectroscopy is enabled with a lateral resolution of 33 μm over a large scanning range of 19×19 mm 2 . Moreover, 2D defect imaging using Doppler broadening spectroscopy (DBS) is demonstrated to be performed within exceptional short measurement times of less than two minutes for an area of 1×1 mm 2 (100×100 μm 2 ) with a resolution of 250 μm (50 μm). We studied the defect structure in laser beam welds of the high-strength age-hardened Al alloy (AlCu 6 Mn, EN AW-2219 T87) by applying (coincident) DBS with unprecedented spatial resolution. The visualization of the defect distribution revealed a sharp transition between the raw material and the welded zone as well as a very small heat affected zone. Vacancy-like defects and Cu rich precipitates are detected in the as-received material and, to a lesser extent, in the transition zone of the weld. Most notably, in the center of the weld vacancies without forming Cu-vacancy complexes, and the dissolution of the Cu atoms in the crystal lattice, i.e. formation of a supersaturated solution, could be clearly identified.

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Section: Laser Beam Welding (Lbw)mentioning

confidence: 99%

Defect imaging and detection of precipitates using a new scanning positron microbeam

et al. 2017

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“…One of the promising ways to joint parts from these alloys is laser welding. Replacing rivets with welded joints reduces aircraft weight by 15% – 20% 11,12 . However, the strength of the sound welds has been only about 0.6 of the base metal 13 .…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the fracture behaviour of heat‐treated Al–Cu–Li alloy laser welds under low‐cycle fatigue loading

Маликов

Karpov

Orishich

2020

Fatigue Fract Eng Mat Struct

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The paper presents the results of the studies of the effect of temperature on the fracture behaviour of Al-Cu-Li alloy laser welds under low-cycle fatigue loading. The mechanical properties and the microstructure of the welded joints without and after postweld heat treatment (PWHT) were investigated. The tensile strength and the low-cycle fatigue resistance of the welded joints were studied at various test temperatures (20 C, 85 C and − 60 C). It was been found that heating up to 85 C and cooling down to −60 C reduced the maximum number of loading cycles of the welded joints after PWHT by 1.5-2.0 times compared with that at a test temperature of 20 C. K E Y W O R D Saluminium-lithium alloy, fatigue strength, heat treatment, laser welding, microstructure, tensile strength

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“…At present, this innovative technology has already been employed successfully in the series production of Airbus A318 and A380, and proved conducive to improve productivity and reduce weight [4,5].…”

Section: Introductionmentioning

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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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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Laser Beam Welding of Hard to Weld Al Alloys for a Regional Aircraft Fuselage Design – First Results

Cited by 94 publications

References 2 publications

Defect imaging and detection of precipitates using a new scanning positron microbeam

Defect imaging and detection of precipitates using a new scanning positron microbeam

Effect of temperature on the fracture behaviour of heat‐treated Al–Cu–Li alloy laser welds under low‐cycle fatigue loading

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

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