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

Abstract

The present invention can improve accuracy of determining a welding quality or accuracy of maintaining, through feedback, a fixed welding quality in high energy beam welding, and thereby, improves themanufacturing efficiency, that is, the yield of welded articles. The present invention is characterized in that: an image of a molten pool is acquired by a camera; the width, length, and area of themolten pool are acquired by image processing; reflected light, plasma, and thermal radiation light are further acquired by an optical sensor; a weld penetration depth is predicted with high accuracy by multiple regression analysis using signals and using certain signals having interaction therebetween among the signals, and thus, a welding quality is determined with high accuracy; and beam outputand a focal position are also predicted, the beam output and the focal point are maintained at appropriate values by feedback control of the beam output and the focal position, and thus, the welding quality is maintained at a fixed level.

Description

technical field

[0001] The invention relates to high energy beam welding, in particular to a high energy beam welding method for motor vehicle accessories. Background technique

[0002] High-energy beam welding can perform deep penetration welding, and can weld more accurately and at a higher speed than conventional arc welding, so its use has been expanding in recent years. The reason why deep penetration welding is possible is that, for example, a high-energy beam has a higher energy density than arc welding or the like. The metal irradiated by the high-energy beam with high energy density is instantly melted and evaporated. Due to the high reaction force of this vaporization, the melting portion is pressed down, forming a space called a keyhole. The high-energy beam passes through the keyhole and is able to reach the interior of the material, thus achieving a deep penetration weld. In high energy beam welding, conventionally, attention has been paid to management of we...

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