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

Cho, Jungho; Farson, Dave F.; Reiter, Matt J

doi:10.1088/0022-3727/42/11/115501

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…[31][32][33][34][35][36][37][38][39] A way to circumvent this limit is to exploit thermodynamics by entering an adsorption-controlled growth regime where the volatile constituents are provided in excess, but film composition is controlled automatically and locally through the volatility of those constituents to produce single-phase films. [40][41][42][43][44][45][46][47][48][49] Adsorption-control has been extensively used for the growth of oxides [50][51][52] including, most recently, for the growth of epitaxial BaSnO 3 films utilizing metalorganic precursors. 53 In this Letter, we utilize adsorption-controlled growth with inorganic precursors to achieve La-doped BaSnO 3 thin films with (1) higher mobility and (2) that are conductive to lower carrier concentrations than have been reported to date.…”

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Adsorption-controlled growth of La-doped BaSnO3 by molecular-beam epitaxy

et al. 2017

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Epitaxial La-doped BaSnO 3 films were grown in an adsorption-controlled regime by molecular-beam epitaxy, where the excess volatile SnO x desorbs from the film surface. A film grown on a (001) DyScO 3 substrate exhibited a mobility of 183 cm 2 ·V -1 ·s -1 at room temperature and 400 cm 2 ·V -1 ·s -1 at 10 K, despite the high concentration (1.2×10 11 cm -2 ) of threading dislocations present. In comparison to other reports, we observe a much lower concentration of (BaO) 2 Ruddlesden-Popper crystallographic shear faults. This suggests that in addition to threading dislocations that other defects-possibly (BaO) 2 crystallographic shear defects or point defects-significantly reduce the electron mobility.

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confidence: 99%

Adsorption-controlled growth of La-doped BaSnO3 by molecular-beam epitaxy

et al. 2017

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“…3 In that work, sinusoidal laser power modulation up to an upper frequency response limit of about 1 kHz produced corresponding periodic penetration variations. 3 In that work, sinusoidal laser power modulation up to an upper frequency response limit of about 1 kHz produced corresponding periodic penetration variations.…”

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confidence: 84%

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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“…16 The so-called spiking during welding of steel was also shown to be reduced by laser power modulation. 22 Furthermore, laser power modulation was used to reduce the number of melt ejections and to expand the process window for a stable copper welding process. 8,17 In the following, we therefore report on the application of laser power modulation to stabilize the welding process in copper and discuss the influence of the welding and modulation parameters on the seam quality.…”

Section: Stabilization Of the Welding Processmentioning

confidence: 99%

Power modulation to stabilize laser welding of copper

Heider¹,

Weber²,

Herrmann

et al. 2015

Journal of Laser Applications

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Due to its high electric and thermal conductivity, copper has a wide range of applications. Many of those require an efficient and reliable welding process most preferably performed with laser beams. The low absorptivity of copper at a wavelength of 1 lm together with its high heat conductivity however make remote laser welding of copper a challenging task. With the currently commercially available lasers, welds with penetration depths of several millimeters in copper can only be achieved at comparatively low welding speeds (v < 10 m/min), which, however, leads to numerous defects such as melt ejections and pores. In this paper, we discuss the approach of laser power modulation to stabilize the welding of copper. It is demonstrated that the modulation of the laser power with the appropriate parameters significantly improves the weld quality. The influence of the average power, the modulation amplitude, welding speed, focal diameter, and modulation frequency on the welding quality is discussed. V C 2015 Laser Institute of America.

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

Cited by 15 publications

References 27 publications

Adsorption-controlled growth of La-doped BaSnO3 by molecular-beam epitaxy

Adsorption-controlled growth of La-doped BaSnO3 by molecular-beam epitaxy

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

Power modulation to stabilize laser welding of copper

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