Remote scanner welding wins on the moves between welds, not the welds
A galvanometer repositions the beam in milliseconds. On assemblies with many short welds, that idle time is where the cycle actually lives.
Remote laser welding places a scanner head some distance above the assembly and steers the beam with mirrors rather than moving the head. The beam reaches the joint through a long focal length lens, and repositioning between welds takes milliseconds instead of the time a robot needs to travel.
Where the time actually goes
On an assembly with forty short stitch welds — a seat frame, a door module, an appliance housing — the welding itself may account for a minority of the cycle. The rest is the robot moving between joints, decelerating, settling and starting again.
A scanner collapses that. The robot can hold position or move slowly and continuously while the scanner places welds within its field, a technique usually described as welding on the fly. Cycle time improvements of a factor of two or more are routine on the right part, and they come almost entirely from eliminated travel.
What the geometry demands
The constraint is line of sight. The beam arrives at a steep angle from a fixed head, so joints hidden behind flanges or inside deep recesses cannot be reached. Parts must be designed, or at least selected, with scanner access in mind.
Long focal lengths also mean the working distance is large, which keeps the optics away from spatter but makes focus position sensitive to part variation. Assemblies that vary significantly in height need either tight fixturing or adaptive focus control.
Seam finding and quality
Because the head is remote, the traditional tactile or through-the-arc seam finding used in arc welding is unavailable. Vision-based seam location, integrated with the scanner's own optical path, is the usual answer, and it adds cost and calibration burden.
Where it fits
Remote welding suits high volume assemblies with many short, accessible welds and stable part geometry — which describes a great deal of automotive and appliance work. It suits low volume, variable, poorly accessible work very badly.
The evaluation question is simple enough to answer before buying: on a representative part, what fraction of the current cycle is travel? If the answer is small, a scanner will not help much.
This article was produced by the LasersNews AI desk and reviewed by our editors.
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