Study on welding phenomena observation method based on arc and moltenpool light emission characteristics in visible and infrared wavelength region: Development of image sensing technology for in-process welding monitoring technology

Arc welding is important technology for manufacturing that is directly linked to quality and productivity. Especially GMAW with Ar or CO2 shielding gas is widely used in various industries because of its high productivity. To achieve high quality and productivity, in-process welding quality control technology will be required. In this study, the authors studies the welding phenomena observing technology for online detection of welding defects by using image sensing method. By selecting the transmission wavelength of band-path filter 1320nm, which is in the wavelength range where the brightness of arc light is weak and the brightness of moltenpool light is high, welding phenomena just near arc and moltenpool can be observed clearly.