Algorithm for edge extraction of weld pool of double-electrode MIG welding

Double-electrode MIG welding(DE-GMAW) is a new kind of high-efficiency MIG welding.The acquisition of passive vision was used for the weld pool image of DE-GMAW with continuous and large weld current.And the edge extraction algorithm of the weld pool image was studied.In order to reduce the effect of weld arc signal around the weld pool on its edge extraction,edge extraction with a new kind of image preprocessing algorithm had been proposed.And based on the comparison result of edge extraction with 6 differential operators,a new kind of edge extraction algorithm of weld pool image was proposed,also.The result showed that the new method of image preprocessing was able to reduce effectively the interference of the arc signal around the weld pool in the edge extraction.And the new method of edge extraction algorithm could be used to extract the edge message of weld pool with an accuracy,continuity and smoothness under the condition of continuous high weld current,so that the requirement of the DE-GMAW was met.