METHOD FOR CONTROLLING WELDING CURRENT AT CONTACT SPOT WELDING Russian patent published in 2005 - IPC

FIELD: contact spot AC-welding with use of welding cycle regulator having thyristorized module.

SUBSTANCE: method is realized on change of conductance angle of thyristors. Method comprise steps of preliminarily determining reference points of welding electric currents for each phase of spot welding process; according to said points calculating regression models of amplitude curves of welding currents and calculating values of conductance angle of thyristors depending upon maximum value of welding current, frequency of supply mains, turning-on angle of thyristors, phase shift angle and coefficients of power type polynomial; writing in modules for controlling welding current preliminarily registered in regulator of welding cycle values of conductivity angles of thyristors for their further using at controlling welding current.

EFFECT: enhanced quality of welded joints due to controlling conductivity angle of thyristors for each half-period of welding current at different phases of welding process.

3 dwg