Laser welding with Nd:YAG-multi-beam technique

Hohenberger, Bernd; Chang, C.-L.; Schinzel, C.; Dausinger, Friedrich; Hügel, H.

doi:10.2351/1.5059218

Cited by 15 publications

(9 citation statements)

References 3 publications

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“…Twin beam irradiation can also be simulated: the corresponding profile is then elongated, with its middle upper part being much more stabilized than with a mono-spot irradiation. This behaviour could be correlated to the improvement observed experimentally on the quality of the weld seams when twin beams are used (Hohenberger et al, 1999). In fact, this improvement also has to be considered from a better ability for metal vapour evacuation from the keyhole for these conditions (see Section 8.3.1).…”

Section: Solidified Materialsmentioning

confidence: 63%

“…All these conditions are, of course, very favourable for triggering Rayleigh instability, and finally these mechanisms limit the penetration depth to a finite value for static conditions. From these considerations, one can also understand the improvement generally observed when using large keyhole sections such as those obtained with elongated focal spots (Hohenberger et al, 1999). Much less shear stress occurs inside these enlarged keyholes and so less liquid acceleration is induced, contributing to the improvement of weld seam quality.…”

Section: Welding Speeds Below 5 M/min: 'Rosenthal' Regimementioning

confidence: 96%

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Physical mechanisms controlling keyhole and melt pool dynamics during laser welding

Fabbro

2010

Advances in Laser Materials Processing

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The aim of this chapter is to review our main recent understanding of physical mechanisms occurring during keyhole laser welding. The focus is on the analysis of melt pool dynamics showing that it is the interaction of the vapour plume emitted from the keyhole front with the melt pool that plays a dominant role in melt pool dynamics. Different specific regimes concerning the behaviour of the melt pool for a large range of welding speeds can be observed, and these regimes are precisely defined by the inclination of the keyhole front. a model taking into account these physical processes is proposed and allows us to describe the keyhole parameters and to understand these different observed results.

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Section: Solidified Materialsmentioning

confidence: 63%

Section: Welding Speeds Below 5 M/min: 'Rosenthal' Regimementioning

confidence: 96%

Physical mechanisms controlling keyhole and melt pool dynamics during laser welding

Fabbro

2010

Advances in Laser Materials Processing

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“…Some notches occur, and the ovcrtill of the seam is not constant varying up to 0.3 mm. [8], one might speak here also of,.inline" and ,,cross" orientation. With regard to the energy coupling, the results of the five different wire positions vary again.…”

Section: Effects On Energy Coupling and Melt Pool Dynamicsmentioning

confidence: 96%

Laser welding of aluminum: extended processing potential by different wire positions

et al. 2000

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Aluminum alloys are getting increasingly interesting not only for the classical application in the aircraft industry. hut also in rail and road vehicles and the aggregate manufacturing as well as in many other fields of the metal processing industry. The laser is rarely found as a tool for joining aluminum in series production, up to now. Among others, this is due to the tict that only few instructions for the design of an appropriate joining geometry are available in the literature, in addition, neither hints concerning the laser's suitability for industrial application are provided nor essential issues tr series production by lasers are to be found, such as e.g. acceptable tolerances regarding the joining geometry. In this paper. exeniplary solutions to the problems mentioned above are presented. resulting from the application of a 3 kW fiber-guided Nd:YA(i-l,aser tr tasks in the automotive industry.Taking the example of an overlap joint geometry on the one hand, and the connection of two extrusions t'orniing a ..'l -jointgeometry" on the other hand, there will be shown which tolerance fields exist and in which way and up to which extent a gap can be bridged, not only in a gravity position. In addition, results will be presented, demonstrating that the energy coupling as well as the melt pool dynamics can be influenced by vaing the wire position or using a second wire in an adequate position. Concerning an overlap joint. gaps of more than the doubled size can he bridged with this technique.

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“…They result from a collapse of the keyhole which can be suppressed, most effectively by the double focus technique 7,8 . On the other hand, as can be concluded from experimental evidence 9, 10 , a single keyhole is the more stable the smaller is the width of the weld pool.…”

Section: Process Benefitsmentioning

confidence: 99%

Welding with the thin disc laser: new processing and application potentials

Hügel¹,

Ruβ²,

Weberpals³

et al. 2005

SPIE Proceedings

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Thin disc lasers represent a new class of welding lasers in that they combine the beneficial characteristics of CO 2 -and Nd:YAG-lasers. Their good focusability -values of M² around 20 are typical for devices in the multi kW power rangecan be utilized in several ways to improve the welding performance: compared to lamp-pumped Nd:YAG-lasers, the laser power required at the threshold to the deep penetration regime can be reduced, the welding depth can be increased and far higher values of traverse speed are applicable at prescribed welding depths. Alternatively, the high beam quality allows the use of focusing optics with large focal lengths, hence enabling the realization of "remote welding" concepts. At the same time, a wavelength of 1.03 µm (Yb:YAG) provides, in comparison to CO 2 -lasers, a high absorptivity at metallic workpieces and a low sensitivity against plasma production; both effects contribute to the efficiency, stability and achievable quality of the welding process. Further, beam delivery via flexible glass fibers with core diameters of 100 µm to 150 µm is possible. With these features and an overall (plug) efficiency of more than 20 %, this laser offers a large potential for many applications.

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Laser welding with Nd:YAG-multi-beam technique

Cited by 15 publications

References 3 publications

Physical mechanisms controlling keyhole and melt pool dynamics during laser welding

Physical mechanisms controlling keyhole and melt pool dynamics during laser welding

Laser welding of aluminum: extended processing potential by different wire positions

Welding with the thin disc laser: new processing and application potentials

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