



Size it by the two constraints that cannot be worked around: the mass at the wrist — part, gripper, cabling and any sensor together — and the furthest point the tool must reach at full extension. Everything else follows from those.
The payload covers the laser head, cable and any seam-tracking sensor, not the workpiece. Fit-up tolerance matters more than with arc welding: the spot is small, so gaps that MIG would bridge get cut through instead.