Laser Weld Spot Scanning With Asymmetric Energy Distribution

The patent applies asymmetry by intentionally creating an asymmetric energy distribution in the laser beam's effective spot. The scanning pattern is designed so that the beam spends more time or delivers more energy to specific regions (e.g., thicker sections or harder-to-weld areas) compared to symmetric patterns. This asymmetric energy distribution allows the welding process to adapt to variations in part geometry, thickness, and material properties without requiring complex mechanical adjustments or multiple welding passes.

The patent implements periodic action through the oscillating or scanning motion of the laser beam perpendicular to the welding direction. The beam repeatedly scans back and forth across the weld seam in a controlled pattern, creating a periodic heating cycle. This periodic action ensures that each portion of the weld receives sufficient cumulative energy input even at high travel speeds, maintaining weld quality while preserving high productivity. The scanning frequency and amplitude are optimized to balance heating effectiveness with welding speed.

The patent applies local quality by distributing the laser energy non-uniformly across the weld seam through the scanning pattern. Instead of concentrating all energy in a single high-power spot, the beam is scanned in a pattern that delivers appropriate energy levels to different local regions. Areas requiring deeper penetration receive more energy accumulation through repeated scanning passes, while sensitive areas receive controlled energy input to avoid excessive heat input, distortion, or defects. This localized energy control achieves deep penetration where needed while minimizing harmful effects.