Hello monsoon12, the short answer is yes. There are many different filler wires for GTAW that will allow you to "weld" the brasses, bronzes, and coppers to steel, similarly there are various GMAW wires that will allow the same to be true for that process. As far as the SMAW process is concerned I'm a bit foggy on that one, but I also believe that is possible, I don't have a filler metals book handy to verify though. Brazing is also readily possible. I'm sure others who have had direct experience on this will chime in here. Regards, aevald