Single-sided laser beam welding of a dissimilar AA2024–AA7050 T-joint

Enz, Josephin; Khomenko, V. I.; Riekehr, Stefan; Ventzke, Volker; Huber, N.; Kashaev, Nikolai

doi:10.1016/j.matdes.2015.03.049

Cited by 48 publications

(18 citation statements)

References 8 publications

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“…The welded area where the laser beam was introduced exhibited a concave shape, whereas a slightly convex shape was observed in the non-welded area. This observation is typical for single-sided laser welding and has been reported in other studies [20]. As shown in Figure 4, the weld pools displayed a certain asymmetry and a greater extent of melting was observed on Ti6Al4V skin.…”

Section: Metallurgical Characterizationsupporting

confidence: 84%

Influence of the Overlapping Factor and Welding Speed on T-Joint Welding of Ti6Al4V and Inconel 600 Using Low-Power Fiber Laser

Janasekaran

Tan

Yusof

et al. 2016

Metals

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Double-sided laser beam welding of skin-stringer joints is an established method for many applications. However, in certain cases with limited accessibility, single-sided laser beam joining is considered. In the present study, single-sided welding of titanium alloy Ti6Al4V and nickel-based alloy Inconel 600 in a T-joint configuration was carried out using continuous-wave (CW), low-power Ytterbium (Yb)-fiber laser. The influence of the overlapping factor and welding speed of the laser beam on weld morphology and properties was investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. XRD analysis revealed the presence of intermetallic layers containing NiTi and NiTi 2 at the skin-stringer joint. The strength of the joints was evaluated using pull testing, while the hardness of the joints was analyzed using Vickers hardness measurement at the base metal (BM), fusion zone (FZ) and heat-affected zone (HAZ). The results showed that the highest force needed to break the samples apart was approximately 150 N at a laser welding power of 250 W, welding speed of 40 mm/s and overlapping factor of 50%. During low-power single-sided laser welding, the properties of the T-joints were affected by the overlapping factor and laser welding speed.

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Section: Metallurgical Characterizationsupporting

confidence: 84%

Influence of the Overlapping Factor and Welding Speed on T-Joint Welding of Ti6Al4V and Inconel 600 Using Low-Power Fiber Laser

Janasekaran

Tan

Yusof

et al. 2016

Metals

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“…The Vickers hardness of the material is approximately 150 HV 0.2, and the modulus of elasticity is 73.1 GPa. 31 The flexural testing system, illustrated in Figure 2(a), was used for generating bending stresses over the depth of the specimen. The main advantages of the threepoint flexural test are the simple specimen preparation and easy experimental procedure for introducing a linear stress profile.…”

Section: Hole Drilling Methods Applied To Three-point Flexural Testingmentioning

confidence: 99%

Effect of elasto-plastic material behaviour on determination of residual stress profiles using the hole drilling method

Chupakhin

Kashaev

Huber

2016

The Journal of Strain Analysis for Engineering Design

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The hole drilling method is a well-known technique for the determination of non-uniform residual stress profiles by measuring relaxation distortions caused by the presence of the hole. The integral method, an inverse calculation technique on which the hole drilling method is based, assumes linear elastic material behaviour and is therefore limited to the measurement of residual stresses below 60% of the yield strength. The aim of this study is to investigate the effects of elastic-plastic material behaviour on the determined non-uniform residual stress profile when the residual stresses exceed the given 60% limit. To this end, compressive residual stress profiles, as they are typically induced by laser shock peening, are investigated using finite element simulations followed by an analysis with the integral method. The obtained results from the analysis are compared to the applied residual stress profiles. An evaluation of the deviation between these two profiles provides detailed insight into the expected error as a function of hole drilling depth and the ratio of residual stress magnitude to yield strength. As an additional benefit of the presented approach, it also provides an indication of the range of depth at which the non-uniform residual stress profile should be corrected to reduce measurement error.

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“…The growing acceptance and adoption of laser technology can be seen, for example, in sales statistics, which show an annual growth rate of over 10% for the last few years [2,3]. Modern high power fiber lasers are low maintenance, easy to integrate with production robots, and produce welds with deep penetration and low heat input at high throughput rates [4,5]. High beam quality at high power levels and the decreasing price per kilowatt of laser power are enabling previous limitations to be overcome and opening up new possibilities, especially in keyhole welding.…”

Section: Introductionmentioning

confidence: 99%

“…High power density of the beam means deeper penetration for the same level of power and welding speed. Single-sided welding of T-joints with fiber lasers is not an entirely novel concept, and its applicability and key parameters have been studied, for example, for aluminum welding in the aircraft industry [4]. The high depth-to-width aspect ratio of typical fiber laser welds can be a drawback in medium and thick section welding of Tand fillet joints.…”

Section: Introductionmentioning

confidence: 99%

High Power Fiber Laser Welding of Single Sided T-Joint on Shipbuilding Steel with Different Processing Setups

et al. 2017

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Laser welding of thick plates in production environments is one of the main applications of high power lasers; however, the process has certain limitations. The small spot size of the focused beam produces welds with high depth-to-width aspect ratio but at times fails to provide sufficient reinforcement in certain applications because of poor gap bridging ability. The results of welding shipbuilding steel AH36 with thickness of 8 mm as a single-sided T-joint using a 10 kW fiber laser are presented and discussed in this research paper. Three optical setups with process fibers of 200 µm, 300 µm and 600 µm core diameters were used to study the possibilities and limitations set by the beam delivery system. The main parameters studied were beam inclination angle, beam offset from the joint plane and focal point position. Full penetration joints were produced and the geometry of the welds was examined. It was found that process fibers with smaller core diameter produce deeper penetration but suffer from sensitivity to beam positioning deviation. Larger fibers are less sensitive and produce wider welds but have, in turn, lower penetration at equivalent power levels.

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Single-sided laser beam welding of a dissimilar AA2024–AA7050 T-joint

Cited by 48 publications

References 8 publications

Influence of the Overlapping Factor and Welding Speed on T-Joint Welding of Ti6Al4V and Inconel 600 Using Low-Power Fiber Laser

Influence of the Overlapping Factor and Welding Speed on T-Joint Welding of Ti6Al4V and Inconel 600 Using Low-Power Fiber Laser

Effect of elasto-plastic material behaviour on determination of residual stress profiles using the hole drilling method

High Power Fiber Laser Welding of Single Sided T-Joint on Shipbuilding Steel with Different Processing Setups

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