INVESTIGATION OF PHOTONIC DEVICES PIGTAILING USING LASER WELDING TECHNIQUE

Hastelloy X is a commercially available nickel-chromium-molybdenum superalloy with a good oxidation resistance, a good mechanical properties at high temperature and a significant formability; sine qua criteria for the choice of materials for the production of chambers turbojet combustion which is part of this study [1]. Arc welding technique is commonly used for the manufacturing of parts but the aeronautical requirements becoming increasingly severe especially in terms of reproducibility of geometry and metallurgical grade fillet weld. Laser welding is a viable method of assembly to meet these new demands by its automation to replace longer term the manual TIG welding. The high power CO2laser is extensively used for practical applications such as cutting and welding laser welding. The CO2laser is very used in the industry with regard to Yb:YAG laser which until now was not rather powerful but this changes. The aim of this study was to evaluate the effect of Yb:YAG laser beam parameters on the microstructure and mechanical properties of the laser beam welded superalloys Hastelloy X to define a field of weldability. The implementation of an experimental design approach is required due to the multitude of input parameters and the complexity of the phenomena involved [2-3].

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Fiber alignment shifts in butterfly laser packaging by laser welding technique: measurement and finite element-method analysis

CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on Lasers and Electro-Optics (IEEE Cat. No.03TH8671) ◽

10.1109/cleopr.2003.1274740 ◽

2004 ◽

Author(s):

Y.C. Hsu ◽

W.K. Huang ◽

M.T. Sheen ◽

W.H. Cheng

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Laser Welding ◽

Finite Element Method Analysis ◽

Fiber Alignment ◽

Method Analysis ◽

Welding Technique ◽

Element Method

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The laser welding technique applied to the non precious dental alloys procedure and results

BDJ ◽

10.1038/sj.bdj.4800942a ◽

2001 ◽

Vol 190 (5) ◽

pp. 255-257 ◽

Cited By ~ 6

Author(s):

C. Bertrand ◽

Y. Le Petitcorps ◽

L. Albingre ◽

V. Dupuis

Keyword(s):

Laser Welding ◽

Dental Alloys ◽

Welding Technique

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DIODE LASER-ASSISTED CAROTID BYPASS SURGERY

Neurosurgery ◽

10.1227/01.neu.0000249217.27214.ec ◽

2006 ◽

Vol 59 (6) ◽

pp. 1286-1295 ◽

Cited By ~ 17

Author(s):

Alfredo Puca ◽

Alessio Albanese ◽

Giuseppe Esposito ◽

Giulio Maira ◽

Barbora Tirpakova ◽

...

Keyword(s):

Carotid Artery ◽

Laser Welding ◽

Diode Laser ◽

Common Carotid Artery ◽

Surgical Techniques ◽

Vascular Wall ◽

Dystrophic Calcification ◽

The Common ◽

Welding Technique ◽

Suturing Methods

Abstract OBJECTIVE Conventional suturing methods of microvascular anastomosis are associated with various degrees of vascular wall damage that can lead to thrombosis and bypass occlusion. An experimental model of double end-to-side venous graft anastomosis on the common carotid artery was set up to compare conventional suturing methods with a low-power diode laser vascular welding technique. METHODS The experiments were performed on 40 rabbits that underwent implantation of a 15-mm segment of jugular vein on the common carotid artery. The proximal end-to-side suture was performed by eight interrupted stitches; the distal suture, which was done using a laser welding technique, was supported by four stay sutures. The animals were evaluated after 2 days (n = 15), 9 days (n = 15), and 30 days (n = 10). The vascular segments were excised and subjected to histological, immunohistochemical, and ultrastructural evaluation. RESULTS The average clamping time to perform both anastomoses was 35 minutes. At the end of the follow-up period, one case of complete occlusion was observed after 9 days and one case was observed after 30 days. Surgical observations and pathological evaluation indicated that adoption of the laser welding technique reduced operative time and bleeding. Histologically, a reduction of thrombosis, inflammation, myointimal hyperplasia, and dystrophic calcification was observed in laser-assisted anastomoses. A better preservation of the endothelium was also evident in laser-treated anastomoses. The observed differences were deemed statistically significant (P< 0.05). CONCLUSION Our study demonstrated the efficacy of diode laser welding in improving surgical techniques of high-flow bypass and in reducing the vascular wall damage observed with conventional methods.

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Modeling the Transport Phenomena in Moving 3-D Dual-Beam Laser Keyhole Welding

Heat Transfer: Volume 3 ◽

10.1115/ht2005-72201 ◽

2005 ◽

Cited By ~ 1

Author(s):

J. Zhou ◽

H. L. Tsai ◽

P. C. Wang

Keyword(s):

Laser Beam ◽

Laser Welding ◽

Weld Pool ◽

Transport Phenomena ◽

Pool Shape ◽

Beam Laser ◽

Dual Beam ◽

Laser Keyhole Welding ◽

Weld Pool Shape ◽

Welding Technique

In recent years, laser-beam welding using two laser beams, or dual-beam laser welding, has become an emerging welding technique. Previous studies have demonstrated that it can provide benefits over conventional single-beam laser welding, such as increasing keyhole stability, slowing down cooling rate and delaying the humping onset to a higher welding speed. It is reported that the dual beam laser welding can significantly improve weld quality. However, so far the development of the dual-beam laser welding technique has been limited to the trial-and-error procedure. In this study, the objective is to develop mathematical models and the associated numerical techniques to investigate the transport phenomena, such as heat transfer, metal flow, keyhole formation and weld pool shape evolutions during the moving three-dimensional dual-beam laser keyhole welding. Detailed studies have been conducted to determine the effects of key parameters, such as laser-beam configuration on weld pool fluid flow, weld shape, and keyhole dynamics. Some experimentally observed phenomena, such as the changes of the weld pool shape from oval to circle and from circle to oval during the welding process are predicted and can be well explained by the present model.

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High‐sensitivity measurement microphone using the laser welding technique

The Journal of the Acoustical Society of America ◽

10.1121/1.416929 ◽

1996 ◽

Vol 100 (4) ◽

pp. 2673-2673

Author(s):

Masahiko Sakai ◽

Susumu Fukushima ◽

Masanao Ohashi ◽

Takahiko Ono

Keyword(s):

Laser Welding ◽

High Sensitivity ◽

Sensitivity Measurement ◽

Welding Technique

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The Effect of Using a Metal Tube on Laser Welding of the Battery Case and the Tab for Lithium-Ion Battery

Materials ◽

10.3390/ma13194460 ◽

2020 ◽

Vol 13 (19) ◽

pp. 4460

Author(s):

Lanh Ngoc Trinh ◽

Dongkyoung Lee

Keyword(s):

Laser Welding ◽

Lithium Ion Battery ◽

Lithium Ion ◽

Metal Tube ◽

Lap Joint ◽

Advantages And Disadvantages ◽

Mechanical And Electrical Properties ◽

Battery Case ◽

Positive Effect ◽

Welding Technique

Given the drawbacks of the conventional welding methods in joining the battery case and tab in the lithium-ion battery, the laser welding technique using the metal tube has been introduced for the weld. The metal tube is supposed to contribute a positive effect including protection to the outside structure by blocking the injection of the spatters, and minimization of the contact gap between the battery case and table. However, the use of the metal tube is believed to cause the plume trapped inside and affect the intensity distribution of the laser gaussian beam. Through the observation and analysis in this study, both advantages and disadvantages of the application of the metal tube on the weld have been analyzed. The use of the metal tube prevents the ejection of the spatter to the outside of the welding zone, as well as minimize the air gap between the battery case and tab in the lap joint weld is also minimized. On the other hand, the trapped plume inside the metal tube and the reduction of the energy of the laser beam have been considered to cause significant changes in the morphology, mechanical, and electrical properties of the weld.

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