The marking depth of the 100W fiber laser marking machine is uneven? Follow these steps to learn how to troubleshoot.
During the daily use of the 100W fiber laser marking machine, many people encounter a difficult problem: the marking depth is uneven, with the same workpiece surface having different depths, and there is no pattern to follow. Many people confuse this with "blurred patterns caused by focal shift" and blindly adjust the focal distance, which not only fails to solve the problem but also delays the production schedule. In fact, the uneven marking depth and pattern blurring are two completely different faults. They are more likely to stem from internal hardware wear and tear of the 100W fiber laser marking machine or unreasonable parameter settings. As long as the core cause is identified and the steps are followed, it can be easily diagnosed and resolved without bothering professional maintenance personnel. Let's be clear: marking blurring means "unable to see the outline clearly", while uneven marking depth means "the outline is clear, but some areas are deep and some are shallow". The fault roots of these two are completely different. Everyone must distinguish them to avoid going in a wrong direction. Based on practical experience on the front line, the core reasons for uneven marking depth mainly include three points. Each point is explained in a simple and understandable way and can also be quickly matched with the situation of your own equipment.
The first core reason: Laser energy attenuation. The core component of a 100W fiber laser marking machine is the laser itself, just like the battery of our mobile phones. After long-term high-load usage, the internal core parts will gradually age, resulting in unstable laser energy output - sometimes strong, sometimes weak. The energy applied to the workpiece surface will be different, and thus the marking depth will vary from deep to shallow. This situation is more likely to occur in equipment that has been used for more than one year. Many people may not know that the laser needs regular maintenance. They often don't notice the problem until it becomes severe.
The second core reason: Uneven scanning speed of the galvanometer. The galvanometer is the key component for controlling the laser scanning trajectory. It contains motors and bearings. After long-term operation, the motor may wear out, and the bearings may become loose. As a result, the scanning speed of the galvanometer on the workpiece will be inconsistent. Some areas will be scanned quickly, while others will be scanned slowly. The time that the laser acts on the workpiece surface will be different, and thus the depth will also vary. This fault is usually accompanied by slight abnormal sounds from the equipment. Pay attention to the sounds when the equipment is running.
The third core reason: issues with the workpiece or the fixture. This point is often overlooked. One might assume that the problem lies with the equipment itself. However, if the surface of the workpiece is uneven or the fixture is not securely fixed, it can also result in inconsistent marking depths. For instance, if there are protrusions or depressions on the workpiece surface, or if the fixture is subjected to different forces, the distance between the workpiece and the laser focus will be inconsistent - areas closer to the laser will have more concentrated energy and thus deeper marking; areas farther away will have more dispersed energy and thus shallower marking. Moreover, this difference in depth does not follow a pattern and is difficult to quickly identify the root cause.
Based on the above three reasons, we have compiled step-by-step and practical solutions that are suitable for beginners. The process is fully aligned with the operating level of beginners, and no professional tools or specialized knowledge are required. By following the instructions, you can easily identify and solve the problem. Practical tips will also be provided to help you avoid secondary faults. Here are the steps:
1. Test the laser energy. You don't need to disassemble the equipment yourself. Just contact the equipment's after-sales service and have the staff use professional instruments to test the output power of the laser. You can refer to this: If the detected energy decay exceeds 20%, it indicates that the laser needs maintenance or the internal core components need to be replaced. During daily use, beginners should be aware not to let the equipment operate under high load for a long time. Before shutting down the equipment, let it run unloaded for 5 minutes each day, which can effectively delay the aging of the laser.
2. Check the state of the mirror. First, turn off the equipment power and unplug the power plug to avoid electric shock. Then, gently remove the mirror housing and inspect the motor and bearings inside: If you see wear marks on the motor surface or feel any jamming or looseness when rotating the bearing, it indicates that replacement of parts is necessary. After replacement, contact the after-sales service to help re-calibrate the scanning accuracy of the mirror. Beginners should not blindly adjust by themselves to avoid damaging the mirror.
3. Handle the workpiece and fixtures. This step is the easiest for beginners to handle and the one that is most easily overlooked. It is recommended that when encountering uneven depth issues, you first check this aspect. First, use a flat surface or tool to check if the workpiece surface is smooth, with any protrusions or depressions. Perform grinding treatment to ensure the workpiece surface is smooth. Then, adjust the fixture, tighten the fixture screws, and make the fixture evenly stressed. You can also attach a non-slip pad at the contact area between the fixture and the workpiece to prevent slight displacement of the workpiece during batch marking, ensuring that the distance between the workpiece and the laser focus is consistent.
Finally, optimize the marking parameters. Inappropriate parameter settings can also exacerbate the uneven depth problem. Beginners can refer to this adjustment standard: When marking metal parts with a 100W fiber laser, appropriately reduce the marking speed (recommend setting it to 2500-4000mm/s), slightly increase the power (recommend setting it to 70%-80%), and if the depth difference is still obvious, you can appropriately increase the marking frequency (1-2 times) to effectively improve the uniformity of the marking depth. If the marking depth is uneven in a 100W fiber laser, do not panic. First, distinguish the fault type clearly, then check the above three reasons one by one, and follow the steps to solve the problem quickly.
During daily use, regularly cleaning the equipment, inspecting the fixtures and the galvanometer, and avoiding long-term high-load operation of the equipment can significantly reduce the occurrence of such faults. If the above methods still cannot solve the problem, then contact the professional after-sales service for repair. This not only saves time but also reduces maintenance costs. Even beginners can easily handle equipment failures and ensure smooth production