Patent ID: 9511435
Filing Date: 2016-12-06
CPC Classification: B23K

Claim Text:
1. A method for controlling a brazing process, including the steps of applying a brazing current through an electrode pressed to a metal surface of a workpiece, and separating the electrode from the metal surface to form a welding arc, characterized by: continuously measuring the brazing current and time for brazing; continuously determining supplied energy on the basis of the brazing current and the brazing time; maintaining the brazing current to be substantially constant for the entire duration of the brazing process via digital switching of current supplied from a DC source, wherein a control structure is used comprising a power control unit and a switched circuit module connected to the DC source, the power control unit using measured value of the brazing current as an input and outputting pulse width modulation signals to the switched circuit module to maintain a predetermined current output of the switched circuit module and to correspondingly keep the brazing current substantially constant; and interrupting supply of the brazing current when a predetermined amount of energy has been supplied.