Optical signal oscillations in laser keyhole welding and potential application to lap welding

Frank Haran, D. P. Hand, S. M. Ebrahim, C. Peters, J. D C Jones

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We describe an optical sensor for process monitoring of Nd:YAG laser welding. This sensor detects the broadband radiation produced by the welding process, dividing it into broad spectral bands (designated UV/visible and IR). Fourier analysis is used to investigate an oscillatory intensity modulation of the optical signals, which is believed to arise from a combination of keyhole and weld-pool oscillations. The spectral content of the oscillations may be used to detect a fully open welding keyhole and to determine the work-piece thickness under this welding regime. These oscillations have also been utilized in the development of a tracking technique which detects the misalignment from an overlap welding seam and excessive gaps in the lap joint.

Original languageEnglish
Pages (from-to)627-633
Number of pages7
JournalMeasurement Science and Technology
Volume8
Issue number6
DOIs
Publication statusPublished - Jun 1997

Fingerprint Dive into the research topics of 'Optical signal oscillations in laser keyhole welding and potential application to lap welding'. Together they form a unique fingerprint.

Cite this