Why Stainless Steel is Laser-Friendly
Unlike aluminum (which reflects the beam) or galvanized steel (which produces toxic fumes),stainless steel absorbs laser energy efficiently and produces clean, strong welds with minimal preparation.
- High Absorption: 304 and 316 stainless absorb 1064nm laser light well.
- Low Thermal Conductivity: Heat stays concentrated at the weld zone.
- Corrosion Resistance: The chromium oxide layer regenerates after welding.
Stainless Steel Parameter Chart
These are starting points for 1500W fiber laser welders with Sup20s or similar heads.
| Material | Thickness | Power | Speed | Gas | Wobble |
|---|---|---|---|---|---|
| 304 Stainless | 1.0 mm | 300-400W | 25-30 mm/s | Nitrogen 15L/min | 1.0mm / 10Hz |
| 304 Stainless | 2.0 mm | 700-900W | 15-20 mm/s | Nitrogen 18L/min | 1.4mm / 10Hz |
| 304 Stainless | 3.0 mm | 1200-1500W | 8-12 mm/s | Nitrogen 20L/min | 1.8mm / 8Hz |
| 316L Stainless | 2.0 mm | 800-1000W | 12-18 mm/s | Nitrogen 18L/min | 1.4mm / 10Hz |
Troubleshooting Common Issues
- Yellow/Brown Discoloration: Too much heat input.Fix: Increase speed or reduce power. Also ensure nitrogen gas flow is adequate (15-20L/min).
- Warping (Thin Sheets): Excessive heat buildup.Fix: Use stitch welding (short bursts) or reduce duty cycle. Clamp parts firmly.
- Weak Penetration: Speed too fast or power too low.Fix: Slow down or increase power. Check focus distance.
- Spatter: Surface contamination (oil/grease).Fix: Clean with acetone before welding.
Why Nitrogen for Stainless?
Nitrogen is the preferred shielding gas for stainless steel because it prevents oxidation (which causes the ugly yellow/brown tint) and is cheaper than Argon.
For food-grade or medical applications (where you need a perfectly silver weld), use Argon + 2% Hydrogen mix for best results.