Observation of welding phenomena with blowholes for detection of welding defects

– Development of in-process welding monitoring technology with image sensing technology –

Abstract

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 observe welding phenomena with Blowholes(BH) by using high speed cameras to develop in-process welding defects detection technology with image sensing methods. By observing welding phenomena with BH bubbling phenomena are observed just under the arc and on the surface of moltenpool. It was found that the bubble generation on the surface of the molten pool is correlated with the pinhole generation, and the bubble generation just under the arc is correlated with the blowhole generation.