Jewelry Laser Welding Machine
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Technical parameters| Model | EETO-CY-W260 |
| Laser working substance | Nd3+:YAG |
| Laser power | 260W |
| Max. single-pulse energy | 80J |
| Total power | 6KW |
| Laser wavelength | 1064nm |
| Spot diameter | ф0.10-3.0mm adjustable() |
| Pulse width | 0.2-20ms adjustable() |
| Pulse frequency | 1-50HZ adjustable() |
| Welding depth | ≤1mm |
| Control | Single-chip microprocessor |
| Observing system | microscope |
| Cooling system | Water chiller |
| Power supply | AC 220V±10%/50HZ |
| Dimention | 920mm*560mm*1220mm (L*W*H) |
| Weight | 180kg |
1.1 laser spot welding working principle
The use of high-energy laser pulse on the material within a small area of the local heating, laser radiation energy through heat transfer to the material's internal diffusion, the material melted to form a specific weld pool. It is a new type of welding, mainly for thin-walled materials, precision parts of the welding, can be spot welding, butt welding, welding, sealing welding, high aspect ratio, weld width, heat-affected zone, Small deformation, fast welding speed, smooth weld, beautiful, no need to deal with after welding or simply deal with, weld quality, non-porosity, can be precisely controlled, focused light spot, high positioning accuracy, easy to automate.
Welding characteristics are fusion welding, the laser beam as the energy source, impact on the weld joint.
The laser beam can be guided by a planar optical element (such as a mirror), which is then projected onto the weld by a reflective focusing element or lens. Laser welding machine is non-contact welding, the process does not require pressure, but need to use inert gas to prevent pool oxidation, metal filler occasionally used. Laser welding with MIG welding laser MIG composite welding composition, to achieve penetration welding, while the heat input than MIG welding greatly reduced.
Laser spot welding is one of the important methods of laser material processing technology. The spot welding process belongs to the heat conduction type. That is, the laser radiation heats the surface of the workpiece. The surface heat spreads to the inside through heat conduction. By controlling the width, energy, peak power and repetition Frequency and other parameters, the workpiece melting, the formation of a specific pool. Because of its unique advantages, has been successfully used in gold and silver jewelry processing and micro and small parts welding.
Overall structures and maintenance
The integral machine is composed of five parts, namely, the control cabinet, cooling system, power cabinet, laser and optics processing system.
The equipment can also be divided into five parts in terms of functions, which are:
1) Laser source;
2) Laser power supply;
3) Optics system;
4) Controlling system;
5) Cooling system.
(1) Structure
The laser is a device that converts the electrical energy into the laser energy. This machine employs Nd3+:YAG Laser, consisting of the following parts:
a) Pumping lamp: it converts the electrical energy into the optical energy that can activate the substances for laser processing. The machine adopts pulse xenon lamp with repetition rate of XMC7-125. Both the electrode and quartz glass tube surface need to be cooled during working.
b) Laser crystal: it converts the optical energy into the laser energy. This machine employs the crystal ф8*145mm Nd3+: YAG as its working substance.
Condensing cavity: it focuses the light from the pumping lamp onto the working materials.
The optical resonant cavity can provide optical feedback, allowing the laser to be magnified to form high strength laser for output. This machine employs the plane and parallel cavity made up of flat mirrors with ceramics as its medium. The full reflector's transmit is less than 0.4%, output reflecting mirror's transmit is 85%.
Other parts: high voltage electrode, insulation base plate, positioning bracket, adjustable diaphragm frame and laser holder.
(2) Precautions and maintenance
As the machine is highly precise equipment whose discharging features the high pulse voltage and charging features the large capacity, and the laser focusing energy is highly centralized, the operators must obtain professional knowledge and skills before they work on the machine.
Optical resonant cavity
The two medium diaphragms of optical resonant cavity are absolutely parallel to the laser bar's end face, touching or random adjustment is not allowed. Do not open the outer hood of the laser randomly and keep the optics surface highly clean. Otherwise, the high-energy laser will damage the diaphragm layer. When the laser output energy is lowered down, the operator should first check whether the medium diaphragm is clean. If any dirt, he can use lens paper or cotton wool moistened by the cleaning agent (liquid mixture with ethanol absolute and ethanol respectively occupying 50%, the same when mentioned in the following part) to clean it gently. Then check the resonant cavity to see if it is misadjusted.
Cooling system
The laser has one water inlet pipe and one outlet pipe, respectively connected to the cooling channels of the lamp and bar. Hard water flow at any part will cause large loss. Each time when the equipment is assembled, the operator should check the water flow at each path and make sure no fault exists before starting up the laser.
Xenon lamp replacement
The average service time of the pulse xenon lamp is 108 times of blinking if it works under its rated power and belongs to the consumptive pieces. To ensure the normal performance of the machine, the lamp must be replaced when it has reached its rated blinking times (about 108 times) and the energy becomes low.
In cases that the xenon lamp is damaged or its service time is shorted due to other causes (for example, it can't pre-illuminate or no energy output is available when the voltage is increased to 500V), the xenon lamp should also be replaced.
As the strength of the sealing at the lamp's two ends is relatively low and apt to being damaged, special caution should be offered when substituting the lamp. The following procedures should be followed:
Turn off the machine, cut off the water supply and discharge the remaining electricity on the energy-storage capacitor;
Remove the electrodes of lamp;
Remove the gland of lamp, carefully pull out the lamp from the side of the full reflector;
Use cotton moistened by cleaning agent to clean the sleeving
Check to see if the appearance, size and other aspects of the new lamp is conforming;
Install the new lamp into the chamber, press the gland tight and mount the electrodes;
Connect to the water supply and check the sealing of each part to see if they are reliable;
Turn on the main power to check whether the lamp can discharge normally;
Try single spot operation, check whether the output energy of laser meet the requirements. If the output is not ideal, repeatedly adjust the resonant cavity;
Cover the laser with outer hood.
D.Nd3+:YAG crystal is the core part of the laser, and is fairly expensive. Therefore it should be installed with great care. The two end faces of Nd3+:YAG crystal bar is absolutely parallel to each other and has high cleanliness. If there is any pollutant on the end faces, the luminous efficiency will be lower, the facula mode will deteriorate, or even can't illuminate normally. In that case, the space housing this machine must be cleaned and professionals should be called for related treatment. Take out the Nd3+:YAG crystal bar, use lens paper or absorbent cotton moistened by cleaning agent (liquid mixture with ethanol solution and another respectively occupying 50 %,) to remove the dirt gently. The causes leading to the damage of crystal bar can be described as follows:
a.The flow of cooling water is over or interrupted, the energy input into the lamp makes the lamp and bar overheated, which results in the cracking of the lamp and bar;
b.The end face is bumped, scratched or even damaged by hard object;
c.As the diaphragm layer is polluted , the bar is damaged when the high strength laser passes by;
d.The bar is pressed too tightly or the applied force is uneven when it is installed, the over high interior stress breaks the bar. In this case, the operator should not open the hood of the laser, nor operate the YAG bar. If the end face is found polluted, professionals should be called for the related treatment.
E.The condensing cavity doesn't need maintenance work. Normally, it is not allowed to dismantle the condensing cavity.
F. Over voltage protection
There are three kinds of voltage applied to the pulse xenon lamp in succession, namely, trigger voltage about 13-18 kv, pre-burning open-circuit voltage 1500-1800 v and arc-discharge voltage about 500-2500 v. Therefore, the lamp electrode should not get too close to other metal objects, and a distance of more than 15mm should be kept. The insulation panel's surface should be kept dry and clean so as to avoid pollutions which may lower down the insulation performance to bring short circuit. 
Wuhan EETO Machinery is an integration of a laser cutting machine manufacturer and industrial machinery trading company based in south central China, Wuhan city, China. We have two branch companies.
Wuhan EETO Machinery Trading Co., Ltd
Wuhan EETO Laser Equipment Co., Ltd
We are dedicated and committed to represent the highest quality in equipment and customer service.
Wuhan EETO Laser Equipment Co., Ltd. is a high-tech enterprise dedicated to providing laser intelligent equipment solutions for users all over the world. It is located in Wuhan, a very beautiful city which called Cradle of Laser in China. With our unique geographical and talent advantages, we got the rapid rise in the field of laser, and being a well-known domestic and international laser brand.
At present, Wuhan EETO Laser has global marketing and service network. In the field of metal laser cutting, we have built close cooperation and technical exchanges with Wuhan Raycus Optical Fiber Technology Co., Ltd., British SPI Laser Company and Germany IPG Laser Company. From small power fiber cutting machine to high-power fiber cutting machine and intelligent laser robot products are all available now, and the function is maturing, product quality and standards meet Europe and the United States quality standards.
Lead by Huazhong University of Science and Technology optical engineering doctoral team, with many years sales and after-sales experience, Wuhan EETO's sales and service team adheres to "professional people to do professional things" to provide customers most cost performance products and valuable after-sales service. Our laser equipment have been exported to the United States, Spain, Germany, Italy, Brazil, Mexico, South Africa, Taiwan, India, Indonesia, Thailand, Singapore, Pakistan and many other countries and regions, and specially set up import and export business department to provide value-added services, equipment supporting facilities solutions.
Wuhan EETO Laser will continue to occupy the market with innovation, to win the future with confidence; Not only in-depth to strengthen our core products and competitiveness, but also constantly improve the company's talent development and optimization of technological innovation mechanism; Through the country ' And 'to introduce, go out' under the national macroeconomic strategy, to meet new opportunities and rise to the new occasions, to turn the laser into a new card of China!
