Common Problems and Solutions for Handheld Laser Welding Machines


1.Burn of protective lens
In a short period of time, the protective mirror is damaged and there is a burning spot, and the light-emitting surface of the protective mirror is dotted with damaged spots, showing black spots.

Cause Analysis:
Due to the influence of process/method/setting, etc., the anti-slag will cause damage.

①Appropriately increase the air pressure, usually the flow rate is not less than 15L/min.
②When welding, try to weld the welding gun and the plate at 45°, not vertical.
③Set the parameters as much as possible to slowly rise and fall, such as on/off gas delay 200-500ms, on/off optical power 20%, on/off light progressive time 200-300ms.
④When welding aluminum and galvanized sheets, the welding spatter is large, which will damage the lens more easily than other materials, so the minimum power should be used for welding.
⑤Under high power, the loss of the lens will increase compared to low power, which is an uncontrollable range.
⑥The quality of the protective mirror also determines the durability of its use. It is recommended to use the original lens.


2.Burning of nozzle/nozzle heating


Cause Analysis:
During the welding process, heat diffuses to the copper nozzle and causes damage. During the processing process, the heat source should be analyzed first: lens astigmatism, red light off-center, heat conduction of external materials.

Make sure before handling
①The red light is in the center of the nozzle (polarized light will cause the light to hit the nozzle).
②Appropriate scanning width (maximum setting 5mm, recommended setting within 3mm).
③The focus is at the 0 focus position (the red light spot is the thinnest, and the laser energy is the strongest position).

a. First, clamp the welding head with the ground clip, emit light to the metal plate from a long distance, and check whether the nozzle is hot. If it is not hot, it means that the lens has no problem and there is no astigmatism. In case of heat, the damaged lens needs to be replaced.
b. If the welding product is hot, it means that the material is thermally conductive during welding. In actual use, the outer corner nozzle is more likely to be damaged than the inner corner nozzle.
c. The welding method also affects the hot nozzle, try to weld the welding head and the material at 45°welding.
d. Highly reflective materials such as aluminum plates will cause the copper nozzle to become hot, which is an unavoidable phenomenon.

3.The light becomes weaker during the welding process
The light is very strong at first, and gradually becomes weaker, resulting in failure to fuse or welding spatter into flames.

Cause Analysis:
Usually, the welding gun lens is damaged, including but not limited to the protective lens, focusing, collimation, reflection, priority inspection of the protective lens, any one or more damages may cause this problem;
a. First check the protective lens, the red light output by the welding head is aimed at the white paper, check whether the red light has black spots or black spots, and then pull out the protective lens to check whether the lens has black spots or burned out (it can be replaced by yourself);
b. Check the focusing lens→reflecting lens→collimating lens. To replace these lenses, contact the manufacturer in advance for assistance;
c. Finally, check whether the lens of the laser fiber output head is dirty or damaged. If it is damaged, it needs to be returned to the factory for repair.

Post time: May-21-2022