Welding with High-power Lasers: Trends and Developments

Bachmann, Markus; Gumenyuk, Andrey; Rethmeier, Michael

doi:10.1016/j.phpro.2016.08.003

Cited by 42 publications

(20 citation statements)

References 58 publications

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“…Especially during the last 10 years, the high-power (>10 kW, up to 100 kW) and high-brightness (<15 mm mrad) solid state lasers (fiber lasers or disk lasers) emerged into market [24,25]. Due to the availability of a new generation of high brightness multi-kilowatt solid state lasers, high-power laser beam welding became a new stimulus.…”

Section: The Research Status Of Laser Welding Under Vacuummentioning

confidence: 99%

Laser Welding under Vacuum: A Review

2017

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Laser welding has been widely used in various industry fields. In order to further alter and broaden its applicability, a novel technology of laser welding under vacuum is introduced. The combination of high power laser and low ambient pressure provides an excellent welding performance and quality. In this paper, an overview on laser welding under vacuum is presented. It begins with a short introduction about the research status of laser welding under vacuum. Next, the equipment of laser welding under vacuum is introduced. Then, the fundamental phenomena of laser welding under vacuum, including penetration depth, weld geometry, plasma plume, molten pool and keyhole behaviors, are summarized in detail. Finally, the applications and prospects of laser welding under vacuum are proposed.

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Section: The Research Status Of Laser Welding Under Vacuummentioning

confidence: 99%

Laser Welding under Vacuum: A Review

2017

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“…The deep penetration laser beam welding (LBW) has developed to one of the most promising metal joining methods in the modern manufacturing industry. However, typical autogenous LBW may also confront some issues, including high sensitivity to gap tolerance and severe loss of alloying element due to metal evaporation [1]. It has been found that better capacity of gap bridging and improvement of metallurgical properties can be achieved by LBW with filler wire, namely wire feed LBW (WFLBW) [2].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the magnetohydrodynamics (MHD) theory, a current density j will be induced when electrically conducting fluid, for example liquid metal, flowing in a magnetic field, which gives It has two components: one resulting from temporal variation of magnetic field ( E ) and one resulting from v × B term in Eq. (1), which is always opposite to the flowing direction, namely, magnetic braking. Different effects such as stirring, supporting or deceleration can be produced to control the thermo-fluid flow by choosing a proper external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of thermo-fluid flow and element transport in electromagnetic stirring enhanced wire feed laser beam welding

Meng

Artinov

Bachmann

et al. 2019

International Journal of Heat and Mass Transfer

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The introduction of electromagnetic stirring to laser beam welding can bring several beneficial effects e.g. element homogenization and grain refinement. However, the underlying physics has not been fully explored due to the absence of quantitative data of heat and mass transfer in the molten pool. In this paper, the influence of electromagnetic stirring on the thermo-fluid flow and element transport in the wire feed laser beam welding is studied numerically and experimentally. A threedimensional transient heat transfer and fluid flow model coupled with dynamic keyhole, magnetic induction and element transport is developed for the first time. The results suggest that the Lorentz force produced by an oscillating magnetic field and its induced eddy current shows an important influence on the thermo-fluid flow and the keyhole stability. The melt flow velocity is increased by the electromagnetic stirring at the rear and lower regions of molten pool. The keyhole collapses more frequently at the upper part. The additional elements from the filler wire are significantly homogenized because of the enhanced forward and downward flow. The model is well verified by fusion line shape, high-speed images of molten pool and measured element distribution. This work provides a deeper understanding of the transport phenomena in the laser beam welding with magnetic field.

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“…Several studies were conducted to investigate and increase the weldable material thickness for HLAW. The latest developments and trends in high-power laser beam welding are described in detail in [4]. Single-pass welds up to 28 mm wall thickness were conducted with an electromagnetic weld pool support system with a laser power of just 19 kW [5].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Filler Wire Dilution Using External Oscillating Magnetic Field at Full Penetration Hybrid Laser-Arc Welding of Thick Materials

Üstündağ

Avilov

Gumenyuk

et al. 2019

Metals

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Hybrid laser-arc welding offers many advantages, such as deep penetration, good gap bridge-ability, and low distortion due to reduced heat input. The filler wire which is supplied to the process is used to influence the microstructure and mechanical properties of the weld seam. A typical problem in deep penetration high-power laser beam welding with filler wire and hybrid laser-arc welding is an insufficient mixing of filler material in the weld pool, leading to a non-uniform element distribution in the seam. In this study, oscillating magnetic fields were used to form a non-conservative component of the Lorentz force in the weld pool to improve the element distribution over the entire thickness of the material. Full penetration hybrid laser-arc welds were performed on 20-mm-thick S355J2 steel plates with a nickel-based wire for different arrangements of the oscillating magnetic field. The Energy-dispersive X-ray spectroscopy (EDS) data for the distribution of two tracing elements (Ni and Cr) were used to analyze the homogeneity of dilution of the filler wire. With a 30 • turn of the magnetic field to the welding direction, a radical improvement in the filler material distribution was demonstrated. This would lead to an improvement of the mechanical properties with the use of a suitable filler wire.

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Welding with High-power Lasers: Trends and Developments

Cited by 42 publications

References 58 publications

Laser Welding under Vacuum: A Review

Laser Welding under Vacuum: A Review

Numerical and experimental investigation of thermo-fluid flow and element transport in electromagnetic stirring enhanced wire feed laser beam welding

Improvement of Filler Wire Dilution Using External Oscillating Magnetic Field at Full Penetration Hybrid Laser-Arc Welding of Thick Materials

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