Mr. Kyohei Maeda Profile

Kyohei Maeda

at Kobe Steel Ltd

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Proceedings Article | 12 March 2024 Presentation + Paper

An attenuator arranged in a V-shape beam splitter to make a balanced ring profile

Kazunori Komori, Masaki Takemoto, Kyohei Maeda, Toshifumi Ogawa

Proceedings Volume 12878, 1287804 (2024) https://doi.org/10.1117/12.3001309

KEYWORDS: Beam splitters, Signal attenuation, Transmittance, Axicons, Cameras, Fiber lasers, Copper, Reflection, Attenuators

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It is known that a ring profile using a double-core fiber is effective for decreasing spatter and improves penetration stability for copper and aluminum welding. We considered creating a ring profile with an axicon lens and a single-core laser instead of a double-core laser. However, the light emitted from the delivery fiber is sometimes biased, and thus our ring profile becomes unbalanced beam. In order to correct unbalanced beam, we made a tilt correction mechanism and an alignment profiler. This alignment profiler is detachable and has an attenuator, ND filter and damper. Two beam splitters used for the attenuator were arranged in V-shape, because we have to measure, not collimated light but condensed light. V-shape is able to cancel the transmittance bias of the beam splitter because it has a different transmittance by the incident angle dependence. And furthermore, in order to correct astigmatism caused by V-shape beam splitters, the scale in the beam splitter direction was corrected by the software for the axial direction perpendicular to the beam splitter. By developing such a device, it was possible to visualize the unbalanced state of the ring, and corrected the unbalanced ring to a balanced ring. Thereby, we studied the spatters and penetration stability about copper welding.

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