Influence of oscillating magnetic field on the keyhole stability in deep penetration laser beam welding

Üstündağ, Ömer; Bakir, Nasim; Gumenyuk, Andrey; Rethmeier, Michael

doi:10.1016/j.optlastec.2020.106715

Cited by 14 publications

(3 citation statements)

References 21 publications

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“…Additionally, weld F does not present the solid inclusions of oxide, slag, flux, or copper. Very low porosity formation is also reported in the work of Üstündag et al [45]. In order to prevent porosity, Üstündag et al ascertain that using an oscillating magnetic and electric field (EMF) and its influence on the welding depth favor the stability of the keyhole on a butt configuration of a 25 mm thick structural steel plate (S355J2).…”

Section: Evaluation Of Imperfectionsmentioning

confidence: 84%

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Churiaque

Sánchez-Amaya

Porrúa-Lara³

et al. 2021

Metals

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The present contribution is the first research reporting full penetration HLAW joints in 15 mm thick EH36 steel butt T-welds with square grooves on 2F welding position by single-sided welding. The effects of welding parameters were investigated to increase the quality of the joints. Conditions leading to defect-free full penetration welds fulfilling naval regulations includes a laser power of 12.5 kW, a welding speed of 1.6 m/min and the vertical laser offset distance from the flange of 1 mm. Advanced characterization of selected welds included a microstructural identification by optical microscopy, SEM, and XRD, revealing the presence of acicular, polygonal and Widmanstätten ferrite, lath martensite, and some retained austenite at FZ. Hardness and microhardness mapping tests showed values of 155 HV at base metal and 200 to 380 HV at the fusion zone connecting the web to the flange.

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Section: Evaluation Of Imperfectionsmentioning

confidence: 84%

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Churiaque

Sánchez-Amaya

Porrúa-Lara³

et al. 2021

Metals

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“…One can see that both algorithms lead to energy deposition at the keyhole wall that allows for sufficient accuracy in the calculation of the weld cross section when compared with the experimental conditions in the relatively low welding speed range of 1.3 m min −1 . A preliminary experimental observation technique using a combination of metal and quartz glass in a butt joint configuration according to another study [ 42 ] was used, allowing for optical observation of the weld pool from the side. It shows that narrowing of the weld pool in the longitudinal section and corresponding bulging in the lower part occur, which can neither be seen in the experimental cross sections nor the simulated ones, see Figure 6a.…”

Section: Resultsmentioning

confidence: 99%

Elucidation of the Bulging Effect by an Improved Ray‐Tracing Algorithm in Deep Penetration Wire Feed Laser Beam Welding and Its Influence on the Mixing Behavior

et al. 2022

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Herein, an improved ray‐tracing routine using a virtual mesh refinement approach is adopted in a 3D transient multiphysics computational fluid dynamics model for deep penetration wire feed laser beam welding. In a previous study, it was shown that the improved localization of the reflection points of the subrays within the keyhole leads to a more realistic development of the keyhole depth being validated with experimental results. Another effect investigated in detail herein is a drastic change in the flow behavior in the weld pool, which promotes the occurrence of a necking area in the solidification line and subsequent bulging under specific circumstances. This has a detrimental effect on the filler material element transport in the weld pool, leading to an inhomogeneous dilution of the added material. The numerical observations are backed up by experimentally obtained data, allowing to provide a clear physics‐based explanation of the reduced mixing behavior of the filler wire in the melt pool.

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“…Xu et al [11] performed full-penetration laser welding on A5083 aluminum alloy and they concluded that appropriate oscillating electromagnetic field can effectively reduce the sagging of the weld root. Üstündağ et al [12] conducted laser welding experiment on 25mm thick structural steel with an oscillating magnetic field and they ascertained that the stability of the keyhole and the weld penetration depth were increased by magnetic field. Li et al [13] applied electromagnetic assisted wire wobbling in laser narrow gap welding of 316 L stainless steel and they verified that the wettability of liquid weld metal on the sidewall of the groove was improved.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of magnesium/aluminum laser welding with magnetic field

Zhou

Liu

2021

Int J Adv Manuf Technol

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A three-dimensional numerical model for thermal-fluid-metallurgical coupling was established to inspect the effect from a stable longitudinal magnetic field on molten pool of magnesium/aluminum laser welding. Magnetic field-assisted laser welding platform was built to test the morphology and spectrum of the metal vapor/plasma. The scanning electron microscope (SEM) and energy dispersive spectrometry (EDS) were used to determine the morphology and element distribution of molten pool cross section. Simulation results showed that temperature gradient of molten pool was reduced, heat distribution became uniform, and keyhole area was enlarged. In addition, the flow velocity of molten pool was increased, the vorticity of molten pool was improved, and the flow region of liquid metal was enlarged. Experimental results showed that penetration of molten pool was deeper, the shape of welding pool tended to be symmetrical and the density of Al element distribution in welding pool was increased by magnetic field. Thus, heat and mass transfer in welding pool was promoted due to the application of magnetic field, the elements exchange and the convection of liquid metal were accelerated, and the distribution of Mg-Al compounds should be dispersed under the agitation of Lorentz force. It's predicted that the distribution of Mg-Al compounds in magnesium/aluminum laser welding would be positively affected by magnetic field, which was beneficial to control the weld quality. Hence, numerical results and experimental verification shared good consistency.

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Influence of oscillating magnetic field on the keyhole stability in deep penetration laser beam welding

Cited by 14 publications

References 21 publications

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Elucidation of the Bulging Effect by an Improved Ray‐Tracing Algorithm in Deep Penetration Wire Feed Laser Beam Welding and Its Influence on the Mixing Behavior

Numerical and experimental investigation of magnesium/aluminum laser welding with magnetic field

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