When evaluating a laser welding machine, one of the most important technical factors is positioning accuracy. This determines how precisely the laser beam hits the intended weld point, which directly affects joint quality and consistency.
Understanding the Components of Positioning
Most modern laser welding machines use a combination of motion systems. Galvo scanners handle fast, small-scale beam movement within a defined field (typically 100x100 mm to 300x300 mm). These can achieve positioning accuracy within ±0.02 mm. For larger workpieces, integrated X-Y-Z stages extend the range. When properly calibrated, these linear axes maintain accuracy within ±0.05 mm across the full travel distance.
Factors That Influence Real-World Accuracy
It’s important to note that published specs are measured under ideal conditions. In practice, accuracy depends on several factors:
Thermal stability: Temperature changes can cause material expansion or optical drift.
Workpiece fixturing: Poor clamping leads to misalignment, regardless of machine capability.
Calibration frequency: Regular recalibration of both galvo and motion axes is necessary to maintain precision.
Software compensation: Advanced systems use correction maps to account for field distortion, improving actual weld placement.
Visual Assistance Improves Repeatability
Many users now add CCD cameras to their laser welding machine setup. The camera identifies reference points on the part, allowing the system to adjust for minor placement errors before welding. This brings real-world accuracy closer to theoretical performance, especially in automated production.
The positioning system on a laser welding machine is generally very precise, but achieving consistent results requires attention to environment, maintenance, and integration. For instance, Haiwei Laser’s machines combine robust calibration protocols with reliable service support, helping users maintain accuracy over time. Focus not just on the numbers, but on how the entire system works together in your specific application.