The effect of hybrid welding parameters on welding bead geometric dimensions has always been the focus of laser-arc hybrid welding research, so it’s inevitable to measure the dimensions of welding bead. The paper presents a new measuring system of welding bead sectional dimensions in polar coordinate system. First we can get the outline of the welding bead shape with the SOBEL edge detection algorithm . Secondly locate the center point of welding bead and make it as the original point of the polar coordinate system. Calculate the coordinates of pixels in the welding bead shape outline every other 15 degrees . According to the coordinates gainedand plotting scale, we can calculate the sectional geometric dimensions of welding bead. Comparing the dimensions measured in this paper with those measured manually, we can conclude that the measuring error can be under 3%. The research shows that the measuring methods presented in this paper can dramatically improve the efficiency to measure the dimensions and can also solve the problem that the dimensions of welding bead can notbe measured in polar coordinate system with traditional method. In conclusion this automatic measuring system has a profound meaning to the hybrid welding research.
laser-arc hybrid weldingwld coss sctionSOBEL edge detection algorithmthe sectional outline of welding beadcoordinates of pixels
XUE B，MENG Qi S，CHU H H，et al. Research on forming dimension measurement method of butt welding and surfacing welding based on Cognex Designer ［J］. Science and technology innovation and productivity， 2020（1）：73-76.