Physical processes during pulsed Nd:YAG laser and cw-CO2 laser welding of zinc coated steel

Kielwasser, Mathieu; Fabbro, R.; Petring, Dirk; Poprawe, R.

doi:10.2351/1.5059514

Cited by 11 publications

(10 citation statements)

References 1 publication

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“…It is hoped that this solution offers a better compromise to be implemented on the production lines than any other method [1][2][3][4][5][6][7][8][9][10][11][12] proposed until today. For example, the alternate method of delaying the solidification of the keyhole suffers the problem of strict control of the procedural parameters.…”

Section: Discussionmentioning

confidence: 99%

“…This method can obviously yield good results [3], but is cumbersome to implement on the floor and is thus not practical. Also as a simpler solution, it has been tried to weld with "pulsed laser" and the results have been observed [4]. It has been noted that the weld quality is improved but still the improvement is not up to mark and that the method ends up to be too restrictive for the involved process parameters.…”

Section: Comparison With Other Techniquesmentioning

confidence: 96%

“…In the recent years, many techniques have been proposed to tackle the problem of laser welding of the galvanized steel in lap configuration [2][3][4][5][6][7][8][9]. These techniques have tried from the multitude of facets to approach and solve this problem.…”

Section: Comparison With Other Techniquesmentioning

confidence: 99%

“…As given in Refs. [1][2][3][4][5], the solutions proposed in the last many years have not yet found an easy-to-apply realization to replace conventional spot welding and its electrodes [2]. The many advantages offered by laser welding technology still justify an ongoing quest for some efficient method.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Laser welding of zinc-coated steel with tandem beams: Analysis and comparison

Iqbal

Gualini

Grassi

2007

Journal of Materials Processing Technology

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Section: Discussionmentioning

confidence: 99%

Section: Comparison With Other Techniquesmentioning

confidence: 96%

Section: Comparison With Other Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laser welding of zinc-coated steel with tandem beams: Analysis and comparison

Iqbal

Gualini

Grassi

2007

Journal of Materials Processing Technology

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“…Solutions proposed [1][2][3][4][5][6][7][8][9] in the last 27 years have not yet found an easy-to-apply realization to replace spot welding and its electrodes, which have short lifetime. Solutions proposed [1][2][3][4][5][6][7][8][9] in the last 27 years have not yet found an easy-to-apply realization to replace spot welding and its electrodes, which have short lifetime.…”

Section: Introductionmentioning

confidence: 99%

Modified dual-beam method for welding galvanized steel sheets in lap configuration

Gualini

Iqbal

Grassi

2006

Journal of Laser Applications

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The dual laser beams method to lap weld galvanized steel sheets is being discussed, modeled, and analyzed, involving a precursor beam and a higher-power actual beam used in tandem and generated independently or otherwise split from the same source (Nd:yttrium-aluminum-garnet or CO2 laser). The first beam cuts a slot, thus making an exit path for the zinc vapors, while the second beam welds as required. The article also presents and discusses some experiments performed in laboratory using this method, along with the metallurgical analysis results from laboratory showing total absence of zinc in the weld area.

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Study of CW Nd-Yag laser welding of Zn-coated steel sheets

Fabbro¹,

Coste²,

Goebels³

et al. 2006

J. Phys. D: Appl. Phys.

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The welding of Zn-coated steel thin sheets is a great challenge for the automotive industry. Previous studies have defined the main physical processes involved. For non-controlled conditions, the zinc vapour expelled from the interface of the two sheets violently expands inside the keyhole and expels the melt pool. When using CO2 lasers, we have previously shown that an elongated laser spot produces an elongated keyhole, which is efficient for suppressing this effect. We have adopted a similar approach for CW Nd : Yag laser welding and we observe that an elongated spot is not necessary for achieving good weld seams. Several diagnostics were used in order to understand these interesting results. High-speed video camera visualizations of the top and the bottom of the keyhole during the process show the dynamics of the keyhole hydrodynamic behaviour. It appears that the role of the reflected beam on the front keyhole wall for generating a characteristic rear wall deformation is crucial for an efficient stabilization of the process. Our dynamic keyhole modelling, which includes ray tracing, totally confirms this interpretation and explains the results for very different experimental conditions (effect of welding speed, laser intensity, variable sheet thickness, laser beam intensity distribution) that will be presented.

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Physical processes during pulsed Nd:YAG laser and cw-CO2 laser welding of zinc coated steel

Cited by 11 publications

References 1 publication

Laser welding of zinc-coated steel with tandem beams: Analysis and comparison

Laser welding of zinc-coated steel with tandem beams: Analysis and comparison

Modified dual-beam method for welding galvanized steel sheets in lap configuration

Study of CW Nd-Yag laser welding of Zn-coated steel sheets

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