Mr. Rahul Sharma Profile

Rahul Sharma

at RWTH Aachen Univ

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Proceedings Article | 15 March 2023 Presentation + Paper

Seam geometry manipulation by oscillation amplitude adjustment in the LDNA process

T. Bokelmann, M. Lammers, S. Kaierle, S. Emadmostoufi, O. Mokrov, R. Sharma, U. Reisgen, J. Hermsdorf

Proceedings Volume 12414, 124140D (2023) https://doi.org/10.1117/12.2648703

KEYWORDS: Cladding, Metals, Laser applications

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The Laser assisted double wire with non-transferred arc surfacing process (LDNA) is based on an electric arc to melt the filling wires and a laser beam to shape the melt pool. This work investigates the welding seam characteristics for different oscillation amplitudes with differing laser output power. Therefore, three laser powers between 1,000 W and 2,000 W in combination with a power of 4,800 W brought by the arc are investigated regarding the resulting seam geometry and the dilution ratio. A linear oscillation pattern is used with a constant oscillation frequency of 10 Hz. The investigations are conducted using AISI 316L welding wires of 1.2 mm in diameter and sandblasted AISI 1024 plates of 20 mm thickness. Cross-sections are analyzed to investigate the occurrence of cracks and pores as well as to determine the dilution ratio with the base material. The welding seam geometry is measured with a laser scanning microscope Keyence VK-X1100. The topology of adjacent welding seams is examined showing an increase of the welding seam width with an increase of the oscillation amplitude and the laser output power. Thus, a higher maximal seam width can be applied by adjusting the laser power.

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