removing welded and painted bolts

i'm using an old straight axle on a dart project of mine. i'm going to update the breaks and have to take some other parts of it apart. A lot of the bolts have been welded together painted over and all the fun stuff. i'v been reading about the hot/cold method of removing rusted bolts, would this work? i'm not looking to save anything except the axle and the springs. any ideas?