Has anyone here dabbled in DIY induction-heating? I'd like to hear of anyone who has successfully (or un-successfully) tried this.

I have an idea that requires the heating of the end of thin-walled steel tube to silver soldering temperatures. Typically the last 25mm of a 100mm tube of 2-3mm wall thickness but diameters will vary. Needs to be a fairly portable rig and temperature control can be as crude as an on-off foot switch. If it would be possible with 3KW of power then all the better.