Method of determining the temperature at a spot-welded joint and use of the method for evaluating the quality of the spot-welded joint

摘要

The invention relates to a method of determining a temperature at a spot-welded joint (5) between two parts (1, 2) to be welded together made of at least one first metal. The spot-welded joint (5) is formed by means of at least one electrode (3, 4) in contact with one of the parts (1, 2) and made of a second metal. The temperature is determined here from a thermoelectric voltage measured between the electrode (3, 4) and the parts (1, 2). According to the invention, a first measured value for the thermoelectric voltage is determined before the spot-welded joint (5) is formed and a second measured value for the thermoelectric voltage is determined after the spot-welded joint (5) is formed, and the temperature is determined with regard to both the first and the second measured value. The method is used in particular for evaluating the quality of the spot-welded joint (5). The method is especially suitable for determining the temperature or evaluating the quality for a multiplicity of spot-welded joints (5) to be formed one after the other, in the course of which distinct changes in the temperature of the electrode (3, 4) and the corresponding changes in the thermoelectric voltage measured in each case can be expected. <IMAGE>