8 A variation of this spray arc technique is known as ”pulsed” spray welding. In pulsed spray arc welding, thecurrent is varied between a high and low value. The low level of current is below the transition current whilethe high level is well into the spray arc region. Metal is only transferred to the work during the period of highcurrent. Usually one droplet is transferred during each high current pulse. Figure 1-4 depicts the weldingcurrent pattern used in pulsed spray arc welding. In the United States, only 60 or 120 pulses per second areused. Because the peak current is in the spray arc region, arc stability is similar to that of conventional sprayarc welding. The period of low current maintains the arc and serves to reduce the average current. Thus, thepulse spray technique will produce a spray arc at lower average current levels than are required forconventional spray arc welding. The lower average current makes it possible to weld thinner gaugematerials with spray type transfer using larger sized wire electrodes than otherwise possible. Pulsed sprayarc welding can also be used for out-of-position welding of heavier sections.