Application And Precautions Of Handheld Laser Welding Machine

Hand-held Laser Welding Machines are designed to make stainless steel kitchen utensils exquisite and beautiful. If you want to meet the aesthetic and individual needs of current customers for kitchenware, traditional welding methods are difficult to achieve the ideal effect. Kitchen utensils are used every day in our lives, such as stainless steel pots and pans. But have you ever thought about how it is made? And kitchen utensils are made of a variety of materials, some use ceramics, some plastic, some metal stainless steel. Today we are talking about tableware made of metal stainless steel. We know that one of the processes in the production process of kitchenware is welding. The kitchenware laser welding machine saves about 80% to 90% of electric energy. Compared with arc welding, the processing cost can be reduced by about 30%. It can weld dissimilar steels and dissimilar metals, and realize mechanization and automation easily.
Fast speed, small deformation, small heat-affected zone, high and aspect ratio.
The weld seam is beautiful, smooth, and free of pores, and no treatment or simple treatment is required after welding.
Small focus point, no pollution, high precision positioning.
The handheld laser welding machine can perform tiny open-shaped parts and precision welding.
Due to the extremely low heat input of kitchen utensils during laser welding, the deformation after welding is very small, and a very beautiful welding surface effect can be obtained, and there are few follow-up treatments after welding. The handheld stainless steel laser welding machine can greatly reduce or cancel the huge polishing and finishing Labor costs in the flat process.

Related questions and answers:
Q: How to do the daily maintenance of the laser welding machine
Answer: 1. In order to ensure that the laser is always in a normal working state, after two weeks of continuous operation or when it is stopped for a period of time, the YAG rod, dielectric diaphragm and lens protection glass should be dealt with first before starting up.
Check the components in the optical path such as glass to make sure that there are no abnormal phenomena such as dust pollution and mildew in each optical component. If there are any such phenomena, it should be dealt with in time to ensure that each optical component will not be damaged under strong laser irradiation. (If the equipment is used in a relatively clean environment, the above inspection can be extended to one month or even longer)
2. The purity of the cooling water is the key to ensure the laser output efficiency and the life of the laser condenser cavity components. During use, the conductivity of the internal circulating water should be checked once a week to ensure that its conductivity is 30.5MWcm, and the internal circulation must be replaced once a month. For deionized water, the conductivity of the newly injected pure water must be 32MW-cm. Pay attention to observe the color change of the ion exchange column in the cooling system at any time. Once the color of the resin in the exchange column turns dark brown or even black, the resin should be replaced immediately.

3. Equipment operators can often use black photo paper to check the laser output spot. Once uneven spot or energy drop is found, the resonant cavity of the laser should be adjusted in time to ensure the quality of the laser output beam.

Adjustment of Unadjusted Spot Laser Resonator
Note: The adjustment of the laser must be carried out by specially trained personnel, otherwise it will cause damage to other components on the optical path due to laser misalignment or adjustment.
The adjustment steps of the laser resonator are as follows:;
1. Check the reference light source
The red semiconductor laser is the benchmark of the entire optical path, and its accuracy must be ensured first. Use a simple height gauge to check whether the red light is parallel to the top surface of the guide rail of the optical bench and is on the center line between the two guide rails of the optical bench. If there is any deviation, it can be adjusted with 6 fastening screws. Pay attention to check again after adjustment—whether all the fastening screws have been fully tightened, you need to check it.
2. Adjust the position of the output mirror. Before adjusting the output mirror, the condenser cavity with the YAG rod should be removed, so as not to affect the adjustment accuracy due to the refraction deviation of the YAG rod in the optical path. The exact position of the output medium diaphragm should be the exit hole where the red light is at its center and can completely reflect the red light back to the red light, otherwise it should be carefully adjusted by the knob of the diaphragm holder. Note that after the adjustment, the locking ring on the adjustment knob of the diaphragm holder should be fully locked to ensure the stability of its position, and then check again whether the position of the reflected light remains in its original position.
3. Check the installation position of the YAG rod and stick it on both ends of the YAG rod sleeve with transparent adhesive tape, and observe whether the red light spot is in the middle of the two rod sleeves. If there is any deviation, you should adjust the position of the focusing cavity be corrected. Then observe the position of the reflected light of the YAG rod, which should coincide with the exit hole of the red light. Otherwise, adjust the position of the light-condensing cavity under the premise of keeping the red light at the center of the rod sleeve as much as possible, so that the reflected light is as close as possible to the exit hole. , at least ensure that it is adjusted to the deviation from the exit hole
The difference is less than 1mm.
4. Adjust the position of the full mirror
Check whether the red light is in the middle of the dielectric diaphragm, otherwise adjust the installation position of the dielectric diaphragm holder so that the red light is in the center of the dielectric diaphragm. Coarsely adjust the dielectric diaphragm holder knob to reflect red light back to the exit perforation. Check whether the laser beam coincides with the red light, fix the image paper on the front end of the laser output mirror and keep it as far away from the output mirror as possible, send out a laser pulse, and observe whether the center of the light spot on the image paper coincides with the center of the red light, if not , you can fine-tune the output mirror and the total reflection mirror to make the light spot coincide with the red light, and then fix the image paper at a place 800~1000mm away from the laser output mirror, and check whether the light spot coincides with the red light again. If they can overlap well, the laser is adjusted to the best state. Tighten each adjustment knob, and check again whether the light spot on the image paper is good and coaxial with the red light. Otherwise it should be readjusted. (The above must be checked)
5. Check the position of the shutter
Manually rotate the reflector bracket, push the shutter to the light-blocking position, and observe whether the red light is in the middle of the lens, and whether the reflected light is on the absorption cone in the center of the beam terminator. If the position is not correct, you can adjust it slightly. , Special attention should be paid to double-check whether the reflective lens of the lower shutter is clean, and the contaminated lens will burst soon during use. At this point, the adjustment work of the laser part is completed.

The main content of cooling system maintenance
The main content of maintenance includes checking the water quality of the cooling water, cleaning the water tank and pipes, and checking whether the protection circuit operates normally. In the case of frequent use, the water quality must be checked once a week to ensure the quality of the cooling medium at any time. The method of inspection is to put the multimeter in the 2MW resistance range, and insert the metal exposed parts of the measuring ends of the two test leads into the cooling water surface in parallel at a distance of 1cm. At this time, the resistance reading should be at least greater than 250kW. If the reading is lower than this value, the cooling water should be replaced immediately.

Check Protection Interlock Circuit Stainless Steel Welding Rod
This cooling system is specially designed for the characteristics of laser equipment, and has designed over-temperature sound alarm, over-temperature interlock, flow switch interlock, liquid level protection interlock and other protective measures. During use, the above protection circuits should be checked frequently to ensure their normal and effective functions. The inspection work can be carried out when changing the water. Precautions In a high temperature or humid environment, during the operation of the laser, you should always pay attention to whether there is "condensation" on the cooling water circulation pipe or the laser concentrating cavity due to the low water temperature. Causes 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 "condensation" occurs, the use of 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 condenser cavity dries naturally, to determine whether to clean the YAG rod, and then restart the machine after checking everything is normal. Pay attention to properly adjust the lower limit setting temperature of the thermostat before starting the machine. During normal operation, you should also pay attention to observe whether there is frost on the titanium tube of the refrigeration system. If there is frost, it may be caused by insufficient Freon in the refrigeration system. You should immediately ask relevant professionals to replenish and check for leakage.

Laser welding machines are widely used in the electronics industry, especially in the microelectronics industry. Due to the small heat-affected zone, rapid heating concentration and low thermal stress of laser welding, it is showing unique advantages in the packaging of integrated circuits and semiconductor device casings.

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