ELECTRIC RESISTANCE WELDING METHOD

摘要

PURPOSE: An electric resistance welding method is provided so that not only superior quality of welding parts is secured but also a welding in which working environment is clean is performed by measuring a flame amount generated during welding, thus judging quality of the welding part and controlling a current amount. CONSTITUTION: The electric resistance welding method comprises the steps of setting initial conditions of welding operation, and setting an intensity of welding flame in which good welding part is obtained as a certain limit; mounting a welding material and initiating welding under the initial conditions; continuously sensing an intensity of flame of the welding part after initiation of welding using an optical sensor having a wavelength in the range of 0.3 to 10 microns; and operating by reducing a heat input when the intensity of the continuously sensed flame is higher than the set limit of welding flame and increasing the heat input when the intensity of the continuously sensed flame is lower than the set limit of welding flame.