High speed imaging technique Part 1 – high speed imaging of arc welding phenomena

Abstract

A high speed imaging technique is an attractive tool to elucidate arc welding phenomena. In this study, applications of this technique have been reviewed to aid understanding of arc welding phenomena. Laser illumination with narrow band interference filter is useful to reduce output power of external light. A monochromatic imaging technique is useful for precise measurements. Using narrow band interference filters in infrared wavelength is convenient to evaluate an approximate overview of arc process. It is possible to evaluate surface temperatures of electrode and molten pool. Spectrum distributions of welding and their time series acquisitions are easily obtained using a high speed camera with a special prism attached on the camera. Simultaneous use of many high speed cameras with different wavelength sensitivities aid accurate understanding of physical phenomena during welding. While collection of large datasets from high speed observations leads to data manipulation problems, suitable image analysis techniques allow important characteristics to be extracted in a simple, compact form.