Development of a Low-Cost Arc Spectrum Sensor for Monitoring Pore Defects in Welding Process

Abstract

Commercial spectrometers commonly used in the market have the advantages of high resolution, small size, strong portability and high sensitivity. However, the commercial spectrometers are often unable to meet the needs of spectral information analysis in specific welding scenarios due to the lack of sufficient pertinence in the analysis of arc spectral information. Especially commercial spectrometers are generally expensive, and the software interface is not open, which means that we will not be able to real-time analyze and process the data obtained by spectrometers. Based on this, a low-cost arc spectrum information sensor based on Cherney-Turner optical system is designed and manufactured to detect the formation of hydrogen pore defects in welding process, and to provide support for the follow-up research on hydrogen pore defects. Specifically, we can effectively detect hydrogen content in arc atmosphere by monitoring the spectral intensity of hydrogen atom in arc light during welding process and detect hydrogen pore in molten pool. Experiments show that the sensor achieves real-time and effective detection and acquisition of arc spectrum information in aluminum alloy welding process.