PURPOSE: A submerged arc welding system for tracking a welding line and a method for processing images for the welding line tracking of the system are provided to track the welding line from divided three images obtained form a laser vision system. CONSTITUTION: A submerged arc welding system(100) for tracking a welding line is composed of a welding robot(110), a laser vision system(120), and an image filter(130). The welding robot implements a welding operation. The vision system is installed at one side of the welding robot and processes images obtained by irradiating laser to a welding member to be a welding target. The geometrical shape of the welding member is measured. An image filter is installed at the front of the laser vision system in order to obtain divided three images along the processing direction of the welding system.
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