Pulsed mode power source

This is used to minimize the power of arc during the spray transfer. The basic principle employed is that the metal transfer from the electrode wire takes place either by spray transfer or globular transfer. The critical current at which globular to spray transition taking place is known as transition current. In this mode, the current is raised above the transition current for some time to allow transfer of a few droplets. This current is called pulse current. Major disadvantage of this system is that it is difficult to set the variables for a given welding requirements.