High energy beam welding quality judgment method, quality judgment device using the judgment method, and welding management system using the judgment method

摘要

An object of the present invention is to, in high-energy beam welding, improve accuracy of determining a welding quality or accuracy of maintaining a certain welding quality by feedback, thereby improving efficiency of manufacturing a welded product, i.e., a yield. One aspect of the present invention acquires an image of a molten pool by a camera, acquires a width, a length, and an area of the molten pool by image processing, further acquires reflected light, plasma, and thermal radiation light by an optical sensor, and carries out a multiple regression analysis with use of the above-described signals and a signal having an interaction effect among them, thereby accurately predicting a weld penetration depth and thus accurately determining the welding quality. Along therewith, the one aspect of the present invention also predicts a beam output and a focal position, and performs feedback control on the beam output and the focal position, thereby keeping the beam output and the focal position at appropriate values and thus maintaining the certain welding quality.