Face de coupe, bavures et défauts d'angle

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• Molten slag left behind in the corners, with localised burning and pitting on the cut face.
• Wavy ripple pattern across the cut face — the face is not flat and the amplitude grows with thickness.
• On a bevelled face one side cuts clean and the other does not — usually a focus or gas-axis problem, not power.
• Square-cornered parts: burning at the corner on carbon steel, dross at the corner on stainless. Corner dwell and lead-out matter more here than speed.
• Oxygen pressure too low — molten slag cannot be expelled, so it re-solidifies on the bottom edge.
• Cutting speed too high — the material is not fully penetrated before the head moves on.
• Rack-and-pinion backlash combined with overly aggressive acceleration.
• Unstable cutting speed traced back to an acceleration parameter that is set too high.
• To cut down piercing spatter: shorten the piercing duty cycle and use more negative focus, enable lead-in and lead-out, tune the curve power, and put small round holes on their own layer with reduced power and speed.
• The four-step fallback for a stubborn dross problem: slow the feed, raise gas pressure, raise the focus, and fit a nozzle one size larger.
• Start the cut with a slow lead-in, or add a circular lead-in at the start of the lead line, to stop burn marks at the entry.
• Position drift diagnosis: round holes came out as a sine curve. Once the arc itself is distorted the offset accumulates into a position error.
• Check whether the sheet is sitting too far off level — an uneven support bed mimics a hundred other faults.
• Will not sever, will not pierce, will not cut through — treat these as one family and check focus, gas and nozzle diameter first.
• Serrated, saw-tooth edge on the cut face — check acceleration limits and the belt or rack for lost motion.
• Kerf measurably wider than it used to be — check focus position, nozzle wear and whether the lens has degraded.