FEM study of analyzing the electrical resistance of brazed joint by the 4-wire technique for quality assurance

The main focus of this feasibility study is the examination of the electrical resistance behavior of the brazed joint. In this regard, different positions of defects within the filler metal as well as different contact positions for the current supply and voltage measurement of the 4-wire technique are investigated by means of FEM-analyses. A key aspect is the evaluation of the particular voltage distribution within the brazed work pieces as a function of these variations and to generate significant potential differences for the measurement of brazed joints. The results will contribute the design of the resistance measurements on various component geometries to enable a precise quality inspection.