Method and device for tracking and measuring welding seam

Abstract

The invention discloses a method and a device for tracking and measuring a welding seam. The method comprises the steps of utilizing a single laser beam to perform laser scanning to the welding seam and regions on two sides of the welding seam along the length of the welding seam, scanning the laser beam and forming diffuse reflection light of light spots to be reflected onto a lens after the laser beam is reflected by the welding seam and the regions on two sides, generating an electric signal corresponding to diffuse reflection light intensity of the light spots on a photosensitive element through lens focusing, judging changes of the width, the central position and the height of the measured welding seam according to the electric signal generated by the photosensitive element and transmitting judging results to a welding actuator, wherein the welding actuator corrects the welding position of the welding seam according to change information of the welding seam. The device comprises a laser beam scanning device, a laser beam processing device, a signal processing and calculating unit and a data transmission unit. The method is simple, the change information of the welding seam can be acquired without a lens group and a high-precision charge coupled device (CCD) imaging chip, and the measuring cost of the welding seam is extremely low.

Description

Technical field [0001] The invention relates to the field of optical sensors, and in particular to a welding seam tracking measurement method and a device related to the geometric feature detection of the welding seam. Background technique [0002] In the welding process, non-linear welds or linear welds with large errors are often encountered. Even if the straightness of the weld is qualified, deformation will occur during welding. These errors will cause the welding position to shift, and in severe cases, the welding will fail. The welding seam tracking measurement is to carry out real-time tracking measurement of the weld seam when welding the weld seam, detect the offset of the weld seam in real time, and then transmit the measurement information of the weld seam to the welding actuator, and adjust the welding gun or The position of the welding seam, so that the two always maintain a proper relative position relationship. [0003] The existing welding seam tracking measuremen...

AI Technical Summary

Problems solved by technology

Existing optical imaging methods require continuous light curtains, high-precision CCD imaging chips, and professional lens groups to create precise optical images, and a set of optical image analysis software is required to analyze the collected optical images. Tracking measurement is complicated, detection cost is high, and it is not conducive to popularization and application

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