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A visual sensing system was developed.The system is suitable for titanium-alloy electron-beam welding,and senses and detects molten-pool dynamic processes.A suite of processing programs for colored molten-pool images in titanium-alloy electron-beam welding was developed using Matlab software; molten-pool edge images are completely obtained using the program.The Matlab software was used to write a program which could extract the molten-pool width. The functional relationship between the molten-pool width and penetration under the experimental conditions was obtained by a curve-fitting method,and provided the theoretical basis for further penetratiori control.