Real-time focus control in laser welding

Frank Haran, D. P. Hand, C. Peters, J. D C Jones

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


We describe a focus control system for Nd:YAG laser welding based on a non-intrusive optical sensor incorporated into the fibre delivery system to detect light generated by the process. This broadband light is separated into two wavelength bands. Simple electronic processing gives an error signal proportional to focal error as a result of chromatic aberrations in the optical delivery system. Focus control is demonstrated for bead-on-plate welds in different materials of varying thicknesses and at various welding speeds. The system was demonstrated with both pulsed and CW laser welding.

Original languageEnglish
Pages (from-to)1095-1098
Number of pages4
JournalMeasurement Science and Technology
Issue number8
Publication statusPublished - Aug 1996


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