FANUC Alarm ARC-125 — Cannot start stitch in a weld
FANUC ARC-125 (“Cannot start stitch in a weld”): An Arc Stitch instruction was executed while welding. First check: Edit the program so the Arc Stitch instruction is not between an Arc Start and Arc End.
Updated 2026-09-17 · LogrobotLM reference
Description
An Arc Stitch instruction was executed while welding. Stitch welds begin with an Arc Stitch and end with an Arc End. Arc Stitch cannot execute between Arc Start and Arc End.
Remedy
Edit the program so the Arc Stitch instruction is not between an Arc Start and Arc End.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →