Table of Contents
What is a Laser Welding Machine
Laser welding machine, commonly known as laser welding machine, laser welding machine, etc., is a machine for processing laser materials. If we divide it into automatic laser welding machine and laser mold welding machine according to its working method , Fiber laser welding machine, laser spot welding machine, the principle of CNC laser welding machine is to use high-energy laser pulses to locally heat the material in a small area, and the energy of the laser radiation diffuses to the interior of the material through heat conduction, and the material is melted.
A specific molten pool is formed for the purpose of welding. With the continuous development and progress of society and the continuous updating of science and technology, many industrial technologies have special requirements for materials, and materials manufactured by smelting methods can no longer meet their needs. Due to the special properties and manufacturing advantages of powder metallurgy materials, some fields that use traditional smelting materials, such as automobiles, airplanes, and tools and cutting tools, are gradually being replaced by powder metallurgy materials. With the increasing development of powder metallurgy materials, it is The problem of connection with other parts is becoming more and more prominent, which limits the application of powder metallurgy materials.
In the early 1980s, CNC laser welding machine entered the field of powder metallurgy material processing with its unique advantages, which opened up new prospects for the application of powder metallurgy materials, such as welding by brazing, which is commonly used in powder metallurgy materials. Diamond, due to its low bonding strength, wide heat-affected zone, especially cannot adapt to high temperature and high strength requirements, causing the solder to melt and fall off, and the use of CNC laser welding machine can improve the welding strength and high temperature resistance. Therefore, CNC laser welding machine has been more and more warmly welcomed by all walks of life. Next, I will introduce to you how to effectively maintain the laser cutting welding machine so that it can have a long service life and Welding quality.
Precautions for Maintenance of CNC Laser Welding Machine
The daily use and maintenance of the laser cutting welding machine must be carried out by specially trained personnel, otherwise serious man-made damage is likely to occur. In the maintenance process, we also need to pay attention to the following precautions:
1. The purity of the cooling water: it is the key to ensure the laser output efficiency of the welding gun and the life of the laser concentrating cavity components. The conductivity of the inner circulating water should be checked once a week during use. The internally circulated deionized water must be replaced once a month. Pay attention to observe the color change of the ion exchange column in the cooling system at any time. Once it is found that the color of the resin in the exchange column becomes dark brown or even black, the resin should be replaced immediately;
2. In a high temperature or humid environment, during the operation of the welding torch laser, you should always pay attention to observe whether the “condensation” phenomenon caused by the low water temperature occurs on the pipeline of the cooling water circulation or the laser concentrating cavity. The appearance of “condensation” will cause damage to the end face of the YAG crystal, resulting in a drop in output power or even failure to emit light. Be careful when using it. If there is “condensation”, the laser welding machine should be stopped immediately, and the condition of the YAG optical surface should be re-checked after the moisture on the surface of the concentrating cavity is naturally dried to determine whether to clean the YAG rod. Before starting the machine, pay attention to properly adjust the lower limit set temperature of the temperature controller. During normal operation, you should also pay attention to observe whether there is frost on the titanium tube of the refrigeration system. If frost occurs, it may be caused by insufficient Freon in the refrigeration system. You should immediately ask the relevant professionals to supplement and check whether there is any leakage;
3. Put the multimeter in the 2MW resistance gear, and insert the exposed metal parts of the two test leads into the cooling water at a distance of 1cm in parallel. The resistance reading at this time should be at least 250kW. If the reading is lower than this value, the cooling water of the welding gun should be replaced immediately;
4. In order to ensure that the laser cutting welding machine is always in a normal working state, after two weeks of continuous operation or when it is stopped for a period of time, the components in the optical path such as the YAG rod, the dielectric diaphragm and the lens protective glass should be checked before starting the machine. Make sure that there are no abnormal phenomena such as dust pollution and mildew in each optical component. If the above phenomenon occurs, it should be dealt with in time to ensure that each optical component will not be damaged under strong laser irradiation;
5. The operator of the laser cutting welding machine can often check the laser output spot with black image paper. Once the uneven spot or energy drop is found, the resonant cavity of the welding gun laser should be adjusted in time to ensure the beam quality of the laser output;
6. Check the welding torch protection interlock circuit Stainless steel electrode: The cooling system is specially designed for the characteristics of the laser equipment, with over-temperature sound alarm, over-temperature interlock, flow switch interlock, liquid level protection interlock and other protection measures. In use, the above protection circuits should be checked frequently to ensure that their functions are normal and effective. Inspection work can be carried out during a water change.
7. In a high temperature or humid environment, during the operation of the laser cutting welding machine, you should always pay attention to observe whether the “condensation” phenomenon caused by the low water temperature occurs on the pipeline of the cooling water circulation or the laser concentrating cavity. “It will cause damage to the end face of the YAG crystal, resulting in a drop in output power or even failure to emit light. Be careful when using it. If there is “condensation”, the laser welding machine should be stopped immediately, and the condition of the YAG optical surface should be re-checked after the moisture on the surface of the concentrating cavity is naturally dried to determine whether to clean the YAG rod. Before starting the machine, pay attention to properly adjust the lower limit set temperature of the temperature controller.
Maintenance Measures for Two parts of CNC Laser Welding Machine
1. Maintenance of the welding machine
First of all, special attention should be paid to the fact that the inspection of the internal or external joint terminals of the welding machine must be performed after the input power switch is turned off.
1. Do a good job of testing on a regular basis. For example, check whether the rotation of the cooling fan is smooth when the portable laser welding machine is powered on; whether there is abnormal vibration, sound and smell; whether there is leakage of gas; whether the joints of the welding wire and the insulation wrapping are loose or peeled; And whether there is abnormal heating phenomenon in each wiring part.
2. Since the welding machine is cooled by forced air, it is easy to inhale dust from the surroundings and accumulate in the machine. Therefore, we can regularly use clean and dry compressed air to blow away the dust inside the welding machine. In particular, the transformers, reactance coils, gaps between coils, and power semiconductors should be cleaned.
3. Regularly check the connection parts of the power wiring of the portable laser welding machine. Check whether the terminals on the input side and output side, as well as the wiring parts of the external wiring and the wiring parts of the internal wiring are loose.
4. The long-term use of The portable laser welding machine will inevitably cause the shell to be deformed due to contact, rusted and damaged, and the internal parts will also be worn away. Therefore, the replacement of defective parts and the repair of the shell should be carried out during the annual maintenance and inspection. And comprehensive repair work such as reinforcement of insulation deterioration parts. Replacement of defective parts It is best to replace all new parts at one time during maintenance to ensure the performance of the welding machine.
The regular maintenance and inspection implemented above can reduce the occurrence of welding failures. Although it takes some time and effort, it can prolong the life of the portable laser welding machine, improve the efficiency of the operation, ensure the performance of the welding machine and improve the safety. sex. It is an important content that cannot be ignored in welding work.
2. Maintenance of welding torch
1. Regularly check and replace the contact tip
As the aperture of the worn contact tip becomes larger, the arc will be unstable, the appearance of the weld will deteriorate, or the wire will stick (burn back); the end of the contact tip sticks to splashes, and the wire feeding will become uneven; the contact tip is not tightened tightly, The threaded connection will heat up and die.
2. Regularly clean and replace the spring hose
After the spring hose is used for a long time, a large amount of iron powder, dust, welding wire plating scraps, etc. will accumulate, which will make the wire feeding unstable. So regular cleaning is important, you can curl it and tap it lightly to shake off the buildup, then blow it off with compressed air. The grease on the hose should be scrubbed in the oil with a brush, and then blown off with compressed air. If the spring hose is wrongly wired or seriously deformed and bent, a new hose should be replaced. When changing the tube, make sure that it is suitable for the diameter and length of the welding wire used, and that there is no burr on the cut surface.
3. Inspection of insulating ferrules
If the insulating ferrule is removed for welding, the spatter will adhere to the inside of the nozzle and conduct the nozzle to the live part. The torch may burn out due to a short circuit. At the same time, in order to make the protective gas flow out evenly, an insulating ferrule must be installed.
3. Manual operation and maintenance of hand-held welding machine
1. Portable laser welding machine workers must undergo professional training, understand the use of system indicators and buttons, and be familiar with the most basic equipment knowledge, safety knowledge and precautions before using the portable laser welding machine.
2. Inspection work before portable laser welding machine
There should be no damage to the wire trough and wires; the robot body, external shaft, gun cleaning station, and water cooler are strictly prohibited from placing sundries, tools, etc.;
3 It is strictly forbidden to place liquid objects (such as water bottles) on the control cabinet of the portable laser welding machine;
The operating room is free of flammable items (such as cotton shoes);
The temperature of the operating room shall not exceed 25 degrees Celsius;
No air leakage, water leakage and electricity leakage;
The welding tool thread is not damaged, and the robot is not abnormal;
There is no magnetic field or vibration source (such as a magnet) in the working range of the robot