Stabilization of laser welding processes by means of beam oscillation

Thiel, Christiane; Heß, Axel; Weber, Rudolf; Graf, Thomas

doi:10.1117/12.922403

Cited by 21 publications

(11 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Gaussian distribution is one of the most frequent methods to describe the continuous heat distribution from the laser beam [32]. The newly developed RLW process with an oscillating beam improves strength, reduces spatter formation, and stabilises the process [33,34]. It has also been found to improve the gap bridging ability for imperfect edges due to wider welds in tailored blanks [35] in addition to enhancing joint quality by increasing the bond area [36].…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of thermal quantities for improving remote laser welding process capability space with consideration to beam oscillation

Mohan

Ceglarek

Auinger

2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

This research aims to explore the impact of welding process parameters and beam oscillation on weld thermal cycle during laser welding. A three-dimensional heat transfer model is developed to simulate the welding process, based on finite element method. The results obtained from the model pertaining to thermal cycle and weld morphology are in good agreement with experimental results found in the literature. The developed heat transfer model can quantify the effect of welding process parameters (i.e. heat source power, welding speed, radius of oscillation, and frequecy of oscillation) on the intermediate performance indicators (IPIs) (i.e. peak temperature, heat-affected zone (HAZ) volume, and cooling rate). Parametric contour maps for peak temperature, HAZ volume, and cooling rate are developed for the estimation of the process capability space. An integrated approach for rapid process assessment, and process capability space refinement, based on IPIs is proposed. The process capability space will guide the identification of the initial welding process parameters window and helps in reducing the number of experiments required by refining the process parameters based on the interactions with the IPIs. Among the IPIs, the peak temperature indicates the mode of welding while the HAZ volume and cooling rate represent weld quality. The regression relationship between the welding process parameters and the IPIs is established for quick estimation of IPIs to replace time-consuming numerical simulations. The application of beam oscillation widens the process capability space, making the process parameter selection more flexible due to the increase in distance from the tolerance boundaries.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical modelling of thermal quantities for improving remote laser welding process capability space with consideration to beam oscillation

Mohan

Ceglarek

Auinger

2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Li et al investigated the influence of beam oscillation parameters on weld formations in line-shaped OLBW of 304 stainless steel [15]. Thiel et al compared the weld fusion cross sections under different oscillation parameters and studied the welding process stability in circle and eight-shaped OLBW [16]. Chen et al examined the weld formations and mechanical properties considering the influence of the oscillation amplitude and frequency in infinite-shaped OLBW [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of asymmetric weld fusion geometry in laser welding of aluminium alloy with beam oscillation

Chen

Jiang

et al. 2022

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

In this work, the asymmetric weld fusion geometry in oscillating laser beam welding (OLBW) of aluminium alloy was reported and investigated using a numerical approach. A multi-physics heat transfer and fluid flow model of OLBW was developed and validated with the corresponding experimental results. The weld fusion geometry, temperature fields, and fluid flow behaviours for four commonly used oscillation modes, line, circle, eight, and infinity, were calculated to analyse the origin of the asymmetric weld fusion geometry. The results show the asymmetry of local heat input along beam travelling path and the fluid flow pattern in the molten pool are the main factors that result in the asymmetric weld fusion geometry in OLBW.

show abstract

“…In this work presented here, we investigate the irradiation pattern given by the spatial modulation, the seam dimensions and the temperature distributions for laser welding with this technique. To simplify the investigations, we make bead on plate welds and use a circular oscillatory movement, in contrast to linear oscillations [10,11] or more complex Lissajous-type oscillations [12]. The welding experiments were made for contour welding with and without a superposed oscillatory movement of the laser beam.…”

Section: Introductionmentioning

confidence: 99%

Seam Formation in Laser Beam Micro-Welding with Spatial Power Modulation

Aden

Heinen

Olowinsky

2021

Lasers Manuf. Mater. Process.

View full text Add to dashboard Cite

When laser sources of high brilliance are used for the micro-welding of metals, small seam dimensions are generated. If the spatial power is modulated by a superposition of the linear feed rate and a circular-oscillatory movement of high frequency, the width of the seam is controlled by the amplitude of the circular movement. In this study, the irradiation pattern of the seam was calculated and reveals that some spots of the seam area are not irradiated, while other have been irradiated several times. The seam shapes were visualized with micro cross-sections for different laser powers, linear feed rates and oscillatory amplitudes. Thermal simulations were made to discuss the different seam shapes. A consequence of the oscillatory movement is the appearance of different solidification fronts, which are visible in the micro cross-sections.

show abstract

Stabilization of laser welding processes by means of beam oscillation

Cited by 21 publications

References 4 publications

Numerical modelling of thermal quantities for improving remote laser welding process capability space with consideration to beam oscillation

Numerical modelling of thermal quantities for improving remote laser welding process capability space with consideration to beam oscillation

Numerical investigation of asymmetric weld fusion geometry in laser welding of aluminium alloy with beam oscillation

Seam Formation in Laser Beam Micro-Welding with Spatial Power Modulation

Contact Info

Product

Resources

About