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Dapeng Y.,Wuhan Raycus Fiber Laser Technologies Co. | Libo L.,Wuhan Raycus Fiber Laser Technologies Co. | Xiaoxu L.,Wuhan Raycus Fiber Laser Technologies Co. | Dayong M.,Wuhan Huagong Laser Engineering CO.
Journal of Physics: Conference Series | Year: 2011

Solutions of kW continuous-wave (CW) all-fiber laser are proposed. In our solutions, master oscillator power amplifier (MOPA) configuration is applied. Output power of master oscillator is 10W, and then is amplified to 70W with 1st pre-amplifier and next scaled up to 400W. Finally, 400W fiber laser is used as a basic power unit, and 1000W all-fiber laser can be achieved by means of beam combining with large core double clad fiber (DCF) combiner. In this solution, fiber laser has good stability and reliability for dispersion coupling of pump source and inhibition of photon darkening effect in the fiber. In addition, this solution assures us realize a 1000W all-fiber laser product easily, and the cost is low.

Hu Q.,State Grid Electric Power Research Institute of China | Wang J.,Wuhan Huagong Laser Engineering CO. | Wu X.,State Grid Electric Power Research Institute of China | Pan J.,State Grid Electric Power Research Institute of China | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2016

In order to test the anti-pollution performance of fiberglass-reinforced epoxy composite, and to provide the data for the use of power transmission, by preparing the general molding-epoxy-fiberglass composites with six different hydrophobic coatings on their surfaces, we tested the contact angle, rolling angle, wet-withstand voltage, and pollution withstand voltage of the samples. Moreover, we measured the material surface resistance and electrical properties of antifouling pollution. The results show that the composites with hydrophobic coating improve the anti-pollution performance. The performance of anti-pollution flashover room temperature vulcanized silicone rubber(PRTV) coating is the best whose contact angle is more than 120°. Compared with the composite without coating, the performance of power frequency flashover and withstand voltage increase by 20% for the the PRTV samples in the class III. After several discharge along surface flashover, the hydrophobic surface will weaken or even disappear. In the recovery of hydrophobicity, PRTV and IC701 is better than DS-02 coating. © 2016, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Wuhan Huagong Laser Engineering Co. | Date: 2011-02-15

The present invention discloses a laser puncher for punching holes on tipping paper in a curve manner, which comprises a panel, a light guiding cylinder, a laser connected with the light guiding cylinder, a transmission system driving a piece of tipping paper to move and at least one focusing optical head and at least one driving motor is fixed on the panel, a screw shaft is connected with the driving shaft of the driving motor, a nut is connected with the screw shaft and fixedly connected with a connecting rod, the other end of which is fixedly connected with at least one moving optical cylinder, one end of which is provided with the light guiding cylinder, and the other end of which penetrates the panel to be fixedly connected with the focusing optical head, the external periphery of the moving optical cylinder is provided with an anti-rotation linear bearing, which is fixed on the panel, and the driving motor drives the focusing optical head to reciprocate back and forth via the screw shaft, the nut, the connecting rod and the moving optical cylinder. The present invention can increase the identifiability of tipping papers on which holes are punched with a laser puncher as well as the air permeability of tipping papers.

Wang X.,Huazhong University of Science and Technology | Wang A.,Huazhong University of Science and Technology | Tang H.,Wuhan Huagong Laser Engineering CO. | Xiong D.,Wuhan Huagong Laser Engineering CO. | Ye B.,Wuhan Huagong Laser Engineering CO.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2016

To improve the service life of valves used in pulp industry, Co-based coatings were produced on 304 stainless steel substrate by diode laser cladding. Effect of laser parameters on properties of coating was investigated, and wear resistance of the coating compared with that of the traditional manual surfacing at different temperatures was analyzed. The results show that higher dilution ratio lead to lower hardness and the coating produced with laser power 2000 W and scanning speed 20 mm/s has good morphology and low dilution ratio. Wear tests show that the wear mechanism is abrasiveness at 100 ℃ and 200 ℃, and adhesive wear happen at 300 ℃and 400 ℃. Besides, the wear resistance of the laser cladded coating is better than that of the manual surfacing coating at all temperatures because of dilution, coarse grain and lower hardness. © 2016, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

Weng Z.,Huazhong University of Science and Technology | Wang A.,Huazhong University of Science and Technology | Wang Y.,Huazhong University of Science and Technology | Xiong D.,Wuhan Huagong Laser Engineering CO. | Tang H.,Wuhan Huagong Laser Engineering CO.
Surface and Coatings Technology | Year: 2016

In this research, repairing of V-grooves on ductile cast iron substrates has been successfully completed with diode laser cladding technique using Fe-base self-fluxing alloy powder as the cladding material. The repaired samples are free of any defects such as pores and cracks with appropriate process parameters and the V-groove bevel. The bonding interface behavior at different power levels and the effect of the V-groove bevel on the cracking sensitivity of the coatings have been investigated. Optical microscopy, scanning electron microscopy, energy dispersive microanalysis and X-ray diffraction were used to characterize the cladded layers and bonding interfaces. Microhardness of the repaired samples was evaluated after cladding. The results revealed that good bonding interface with discontinuous fusion zone can be achieved at a lower laser power. The cracking sensitivity of the cladded layer is closely related to the V-groove bevel and the V-groove with larger bevel can be repaired with no cracks and pores. The cladded layers consist of austenite and martensite while some carbides such as Cr7C3, Fe7C3 and Fe3C are formed in the bonding interface. Microhardness is rather homogeneous throughout the cladded layers and much higher than that of the substrate. © 2015 Elsevier B.V.

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