Predetermination of temperatures in resistance welds

ONE of the most important variables in the resistance welding process is the temperature obtained in the region of the weld. If this temperature is too low, the parts will not unite; and if it is too high, a burned weld will result. Besides the necessity for the proper temperature at the surfaces to be joined, it is often essential to bring a considerable portion of the bodies to a plastic temperature in order that the pressure exerted by the electrodes can be transmitted to the surfaces to be joined. Furthermore, the temperature gradients and the rates of heating and cooling have an important bearing on the final quality of the weld. Consequently, it is desirable to have some method by which these quantities can be calculated.