Patent ID: 8878093
Filing Date: 2014-11-04
Classification: B23K,G01N

Abstract:
1. A method for determining a relative moisture content of an adhesive material that is used for joining a pair of work surfaces of a pair of work pieces in conjunction with a resistance welding process utilizing a pair of electrodes, the method comprising: using the resistance welding process to form a welded joint between the pair of work pieces, the pair of work pieces being at least partially separated by a layer of the adhesive material to form a work assembly; determining a resistance value corresponding to an electrical resistivity of the adhesive material during the resistance welding process, including measuring a current and a voltage between the pair of electrodes, calculating a resistance of the work assembly using the measured current and voltage, and subtracting from the calculated resistance a known resistance of the pair of work pieces; determining the relative moisture content of the adhesive material during the resistance welding process using the determined electrical resistivity; and executing a control action when, during the resistance welding process, the determined relative moisture content of the adhesive material exceeds a stored relative moisture threshold value.