METHOD FOR TESTING QUALITY DURING THE RESISTANCE WELDING OF WORKPIECES

摘要

The invention relates to a method for checking the quality in resistance welding of workpieces (121, 122), wherein welding electrodes (111, 112) with the aid of an electrode drive (130) with an electrode force against a welding point (125) of the workpieces (121, 122) are pressed and in the course of a welding process, the welding electrodes (111, 112) are energized with a welding current for the duration of a welding time in order to liquefy a surface of the workpieces (121, 122), a first at a time before the liquefaction begins first value of a welding electrode parameter characterizing a position of one or both electrodes is determined, the welding electrodes (111, 112) being pressed with the electrode force against the welding point (125) of the workpieces (121, 122) at the first time, a second time after the start of liquefaction, a second value of one layer of one or both electrical the characteristic welding electrode parameter is determined, at the second point in time the welding electrodes (111, 112) are pressed with the electrode force against the welding point (125) of the workpieces (121, 122), the first value and the second value being compared with one another and in Depending on a comparison result, a quality of the welding process is assessed.