ELECTRON BEAM WELDING STUDY ON U--Nb--Zr ALLOY. Final Report.

McDougal, J.R.; Greene, L.A.

doi:10.2172/4080654

Cited by 3 publications

(1 citation statement)

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“…[10][11][12] Initially, EBW researchers attempted to correlate the depth fluctuations to variations in the beam power delivered to the work; however, measurements have never shown significant evidence that power fluctuations from the electron beam source itself leads to weld spiking. 11,13 Transverse focus spot oscillations ͑having direction normal to the weld travel direction͒ were found to be better than longitudinal oscillations. The addition of small magnitude, high frequency focus spot oscillations with the linear welding travel speed have been shown to decrease spiking magnitude.…”

Section: Introductionmentioning

confidence: 98%

Control of penetration depth fluctuations in single-mode fiber laser welds

Reiter

Farson

Mehl

2010

Journal of Laser Applications

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Flexible and efficient laser remote welding of ultra-thin metal foils J. Laser Appl. 24, 052005 (2012); 10.2351/1.4746453 Influence of the beam profile formulation when modeling fiber-guided laser welding J. Laser Appl. 23, 042005 (2011); 10.2351/1.3633221 Effect of laser and laser hybrid welding on the corrosion performance of a lean duplex stainless steel J. Laser Appl. 22, 150 (2010); 10.2351/1.3533146Keyhole welding studies with a moderate-power, high-brightness fiber laser Circular focus spot oscillation was investigated as a means of suppressing penetration spiking and related defects in partial penetration single-mode fiber laser welds. Initially, partial penetration welds in stainless steel square-butt joints with linear travel were made to quantify weld and weld spiking characteristics. Then, welds were made with linear travel and superimposed circular oscillations having a range of angular frequencies and diameters. Oscillation parameter ranges which significantly decreased penetration spiking were identified. Additional tests quantified the ability of fiber mode laser welding with circular oscillation to accommodate part alignment mismatch errors.

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Section: Introductionmentioning

confidence: 98%

Control of penetration depth fluctuations in single-mode fiber laser welds

Reiter

Farson

Mehl

2010

Journal of Laser Applications

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Analysis of penetration depth fluctuations in single-mode fibre laser welds

Cho¹,

Farson²,

Reiter³

2009

J. Phys. D: Appl. Phys.

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Penetration depth fluctuations of single-mode fibre laser welds made with long focal length optics and the effects 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 0 Hz to 1 kHz. The amplitude of the frequency response of the laser penetration to large amplitude laser power modulations decreased at rates varying from −20 to −60 dB decade−1 at modulation frequencies from 100 Hz to 1 kHz. It was found that sinusoidal laser power modulation at frequencies from 900 Hz to 3 kHz decreased the aperiodic penetration fluctuations.

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