Judy, Your description fits the textbook methods for the technique
called marriage of metals and the technique presented at ASU the
semester I took a jewelry class there.
I believe that the term has been “borrowed” to apply to some surface
techniques which mimic the visual effect of marriage of metal. The
different metals have been joined, the contrasts are there and can be
accentuated by patination, all of which are characteristic of the
technique you described.
I took a workshop with Carrie Adell a few years ago which included
what she called marriage of metals. She demonstrated application of a
variety of metal pieces to sheet by soldering and then rolling the
composite. The results can include intricate patterns and abstract
effects which would be mighty difficult, not to mention
time-consuming, to achieve by the cut-and-fit model we learned. I
have seen a number of jewelry images with descriptions naming marriage
of metals that appear to be such surface application. The name may be
misappropriated, but the techniques can be stunning and are admittedly
achieved in much less time.