3D Shape Measurement for Pipes, Tubes and Structural Profiles 3D Metrology

Roundness, ovality, straightness, and wall thickness variations are critical quality parameters for tubes, pipes, and structural profiles. Traditional contact gauges miss local defects. Our 3D laser triangulation systems capture the full 360° shape of moving products at line speeds up to 2 m/s, detecting diameter fluctuations, eccentricity, and surface anomalies in real time.

 

1. Beyond Simple Diameter: Why Full Shape Matters

In oil and gas pipelines, automotive exhausts, and structural steel, out-of-roundness or straightness deviations cause welding issues, leak risks, and assembly failures. A single caliper measurement misses localized "banana" defects or polygonal deformation. LGE's 3D Shape Gauge uses multiple laser profilers arranged around the pipe.

2. How 360° Laser Profiling Works

Four to eight laser triangulation sensors (depending on diameter) are mounted around the pipe axis. Each sensor captures a 2D cross-sectional profile. Software stitches these profiles into a complete 3D point cloud, then calculates:

  • Minimum, maximum, and average diameter
  • Ovality (difference between major/minor axes)
  • Eccentricity (wall thickness offset for seamless pipes)
  • Straightness (curvature over length)
  • End flare and bevel geometry

Key Insight: For seamless pipes, our system measures both OD and ID simultaneously using dual-side sensors, detecting wall thickness eccentricity to ±0.05mm - critical for high-pressure applications.

3. Real-Time Rejection and SPC

Defective sections are flagged instantly. Our software can trigger paint marking, activate diverters, or send alarms. Historical data feeds SPC dashboards to track trends in tool wear, billet quality, and mill alignment.

4. Applications Across Industries

- ERW and seamless pipe mills
- Tube drawing and sizing lines
- Automotive driveshafts and exhausts
- Aerospace structural tubes
- Construction hollow sections

  • Diameter range: 5mm to 800mm (custom up to 2m)
  • Measurement speed: Up to 200 profiles per second
  • Accuracy: ±0.05mm on diameter, ±0.1mm on straightness over 3m

"With LGE's 3D shape gauge, we eliminated manual tape measurements and reduced customer returns by 80%." - Quality Manager, Large European Tube Mill