Vision-based online measurement method for weld joint forming characteristics of thick plate T-shaped joint

• Main Authors: LI DAIZE, YU ZHUOHUA, HE YINSHUI, MA GUOHONG
• Format: Patent
• Language: Chinese; English
• Published: 24.07.2020
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The invention provides a vision-based online measurement method for weld joint forming characteristics of a thick plate T-shaped joint. Fusion depth, fusion width and sectional area of weld joint forming can be measured on line. The method comprises steps as follows: firstly, according to an extracted weld joint contour, designing a weld joint contour characteristic point recognition algorithm based on a slope mutation and supervision method, and realizing detection for characteristic points; secondly, proposing a method based on cubic exponential smoothing to carry out fault diagnosis by aiming at the influence of various random interferences in welding on weld joint contour characteristic point detection, and further obtaining effective characteristic points; and finally, calculating thefusion depth, the fusion width and the sectional area of the weld joint on line by using the weld contour and the characteristic points extracted before welding and during welding and adopting a high-order nonlinear fitting