In few months I will finish H-bridge inverter, and, since I'm interested in how induction heating would work for brazing evaporators, I'm going to test. However, I have feeling that it will be more complicated than it seems, because copper is a great conductor and losses caused by eddy currents will be small. In worst scenario it might need a few kW's and high frequencies to get reasonable results. Also, alloy might melt before touching evaporator, since it has a small mass

But! It surely would be fun to just put evaporator inside heating coil and what you would have to do is only touching with brazing alloy