> It is possible to use a standard tin/lead solder on steel and ferrous

Absolutely true when you (well I actually ;-) think about - after all,
what are soldering iron tips made of ? And tabs on shielding ?
And pot cases ?

Tin/lead is not something I'd considered, basically because any
work I do with mixed metal is usually on the large size and I don't
rely on ordinary low-temp solder being strong enough (in my
applications at least). However, Mike's small pieces might well be
able to be done with normal solder. Could even get away with
normal flux too if he's lucky

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