Quality determination method for welding with a high-energy jet, quality-determining device using the quality-determining method and welding-management system using the quality-determining method

摘要

An object of the present invention is to improve the accuracy of determining welding quality or the accuracy of maintaining some weld quality by feedback in welding with a high-energy beam, thereby improving the efficiency in producing a welded product, that is, a yield becomes. In one aspect of the present invention, an image of a molten pool of material is picked up by a camera, a width, a length, and an area of the molten material pool are determined by image processing, and further, reflected light, plasma, and thermal radiation are detected by an optical sensor. and a multiple regression analysis is performed using the previously described signals and a signal representing the effect of an interaction between them, thus accurately predicting a weld penetration depth and thus accurately determining the weld quality. In addition, in the one aspect of the present invention, a beam output and a focus position are also predicted, and feedback control is performed on the beam output and the focus position, thereby maintaining the beam output and the focus position at appropriate values and maintaining the certain welding quality.