METHOD FOR POSITIONING A WELDING TORCH IN THE CENTER-LINE OF THE DESIRED COURSE OF A WELD SEAM

摘要

The invention relates to a method for positioning the welding torch (10) or the welding rod (13) in the center-line of a seam (32). A robot arm positions said welding torch (10) in a predetermined or pre-programmed position between two seam flanks (34, 35). A leveling step is carried out according to which the robot arm displaces the welding torch (10) in one direction until a short-circuit between the welding torch (10) or the welding rod (13) and a seam flank (34, 35) of the work piece (16) occurs. The welding torch (10) is then displaced in the opposite direction until another short-circuit between the welding torch (10) or the welding rod (13) and the other seam flank (34, 35) of the work piece (16) occurs. A control unit (4) calculates the center-line of the weld seam on which the welding torch (10) is to be positioned by evaluating the displacement. The inventive method does not require any additional hardware components.