Method and apparatus for judging quality of resistance brazing

An apparatus for judgment of the quality of resistance brazing provided in a resistance brazing apparatus gripping a weld object between which a brazing material is interposed between a pair of electrodes, applying pressure to copper parts, and feeding power to the electrodes in that state, having a control unit controlling the amount of heat generated at the pair of electrodes during resistance brazing, a power feed time measurement unit measuring a power feed time to electrodes required from when an amount of displacement of the distance between the pair of electrodes reaches a first amount of displacement to a second amount of displacement, and a quality judgment unit judging there was a brazing material if the power feed time is a predetermined threshold value or less and judging there was no brazing material if the power feed time is larger than the predetermined threshold value.