> As far as soldering to steel, isn't that mostly a matter of using
> the right flux?

Silver solder will join steel to brass. Mike's app is physically small
and it could get fiddly and may need cleaning up afterwards. Also
the metals will have to be heated so hot (around 1200F) to melt the
solder that you may as well use the thermal method as others have
mentioned

BTW, it's a good way of using up scrap metal in an "alternative art"
kind of way. I once made what I thought was a pretty nice-looking
wall piece out of brass plate with captured various diameter ball
bearings and aluminium rod

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