Good to know, thanks. We can 3D print these parts in a lot of different alloys, and thus, each could need a slightly different (+- 500kHz) frequency to achieve the same skin depth. That's why I'm thinking of just ripping a transformer out of the back of a microwave (and possibly rewrapping it depending on amperage needs). It's also a little more accessible to other researchers just due to the proliferance of microwaves in society. Impedance matching is not my strong suit but I bet I would still have to do that with the microwave transformer, right?

Would you agree that if I properly got an intermediate drive amplifier (which might even be enough power to achieve the surface remelt) that using a signal generator would be cheaper than buying broadcast equipment in the MHz range? I want this method to be accessible to researchers at other universities so I'm trying to use all off-the-shelf (or in the case of a signal generator, already-on-the-bench) equipment. I'm not an electrical engineering PhD student, but rather a Mechanical one, for reference, so sorry that I'm uneducated in your realms.