#PROCESS STABILITY

Unstable Cutting

Inconsistent cut quality with fluctuating speeds, variable kerf width, and unpredictable edge quality across the workpiece.

Unstable Cut

Stable Cut

Common Symptoms

Inconsistent Kerf Width: Kerf width varies along the cut path by more than 0.1mm, indicating unstable power delivery or beam quality.
Speed Fluctuation: Feed rate oscillates during cutting despite constant program speed, suggesting control system or mechanical issues.
Random Dross Spots: Dross appears and disappears randomly along the cut line without clear pattern, pointing to intermittent process variables.
Cut Start/End Variation: Significant quality difference between cut start and end positions, indicating thermal buildup or parameter drift.

System Layer

This issue involves the following machine subsystems:

Control / Sensor

Height sensor feedback, acceleration profiles, and adaptive speed control directly influence cut stability.

Mechanics

Machine vibration and loose mechanical components cause feed rate oscillation and inconsistent kerf width.

Optical System

Beam alignment drift over time causes gradual power delivery inconsistency at the cut zone.

Root Causes

Beam Alignment Drift

Gradual misalignment of the beam path causes inconsistent power delivery to the cut zone over the course of operation.

Gas Supply Fluctuation

Pressure variations from the gas supply system cause inconsistent melt ejection and unpredictable cut quality.

Mechanical Vibration

Machine structure vibration or resonance at certain cutting speeds disrupts the stability of the cutting process.

Power Supply Instability

Laser power supply ripple or fluctuation causes beam power oscillation that manifests as inconsistent cut quality.

Recommended Solutions

Parameter	Poor Piercing (Typical)	Recommended Range	Improvement
Beam Alignment Check	Every 200h	Every 100h	Stable power delivery
Gas Regulator	Standard (±0.15 bar)	Precision (±0.03 bar)	Consistent melt ejection
Cutting Speed	Variable (auto-adaptive)	Fixed at 1500 mm/min	Stable kerf width
Acceleration Profile	Standard S-curve	Soft-start profile	No start marks

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Engineering Tip: Use the machine's real-time monitoring data (power output, gas pressure, feed rate) to create an overlay chart. If any parameter oscillates more than ±5% from its setpoint during cutting, the root cause is likely in that subsystem. This data-driven approach reduces diagnostic time from hours to minutes.

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