CP1200 is an ultrahigh-resistant structural steel used in the automotive industry for safety parts. Many attempts have been made to join this steel with other lower-resistant steels by using conventional resistance spot welding (RSW). Frequently it resulted in several issues, such as pores, cracks, over-hardened weld nuggets, vert sensitivity to crack HAZ, and the like. In this work Capacity Discharge Welding (CDW) has been proposed as an alternate solid-state welding method aimed at preventing the aforementioned RWD issues while forming a peculiar Electric Current Activated Region (ECAR) rather than a typical HAZ with relevant features, say, much smaller, finer and mechanically tougher than HAZ.