Product Code: ICAL09_1808

Analysis and Control of Penetration Depth Fluctuations in Single-mode Fiber Laser Welds
Yong Chae Lim, The Ohio State University; Columbus OH USA
Matt Reiter, Ohio State University; Columbus OH USA
Jungho Cho, Ohio State University; Columbus OH USA
Dave Farson, The Ohio State University; Columbus OH USA
M. Mehl, Honeywell FM&T; - USA
Presented at ICALEO 2009

Penetration depth fluctuations of single-mode fiber laser welds made with long focal length optics and the affects of sinusoidal laser power modulations were studied. It was found that the welds had a high aspect ratio and were subject to spiking defects. The magnitude of the penetration fluctuations tended to be larger for deeper welds. The weld penetration profiles had positive Maximal Lyapunov Exponents and broadband, aperiodic power spectral densities with most of the signal power in the spectral band from 0Hz to 1kHz. The amplitude of the frequency response of the laser penetration to large amplitude laser power modulations decreased at rates varying from -20db/decade to -60dB/decade at modulation frequencies from 100Hz to 1kHz. It was found that sinusoidal laser power modulation at frequencies from 900Hz to 3kHz decreased the aperiodic penetration fluctuations.

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