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March 18, 2026Progress in Additive ManufacturingOpen Access

Dual scan head approach for in-situ defect detection in laser powder bed fusion of metal

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Authors

DHDennis HöfflinCSChristian SauerASAndreas Schiffler

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Overview

Innovative approach enhances defect detection in metal additive manufacturing, indicating improved reliability.

Key Points

  • The aim is to improve defect detection in laser powder bed fusion through enhanced monitoring techniques.
  • Developed a dual scan head system for precise laser and infrared camera operation.
  • Utilized Synchronized Path Infrared Thermography (SPIT) to identify defects based on cooling behavior.
  • Conducted tests on pre-printed samples with embedded cylindrical defects of varying sizes.
  • Varied volumetric energy density and scanning speed to evaluate monitoring reliability.
  • Successfully detected subsurface defects as small as 356 µm.
  • Improved reliability in identifying defects through synchronized scanning.
  • Demonstrated that varying energy density and scanning speed influences defect detection.

Cite This Study

Höfflin et al. (2026) studied this question.

synapsesocial.com/papers/69ba422e4e9516ffd37a2327https://doi.org/10.1007/s40964-026-01568-0
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