METHOD FOR CONTACT SPOT WELDING Russian patent published in 2002 - IPC

FIELD: non-detachable joints of parts of steel and alloys, mainly in machine engineering and at manufacture of aircraft engines. SUBSTANCE: method comprises steps of clamping welded parts between electrodes at applying compression effort; turning on welding electric current and in time period consisting at least (0.1-50)% of total duration of pulse of welding electric current decreasing value of compression effort in such a way that at time moment of electric current pulse termination to achieve value of compression effort consisting (10-50)% of its initial value; using standard welding electrodes with flat or spherical surface. Method allows to change deformation and temperature fields at welding process, that is why it is possible to simplify welding process. EFFECT: enhanced fusion capability, high quality of welded joints. 1 dwg