The main issue with soldering any form of stainless (including nichrome)
is physically removing as much oxide as possible, and using an adequate
flux for further chemical oxide removal, whether for soldering or
brazing. A fast-forming resistant oxide layer is what makes stainless
stainless.
You can certainly solder stainless with ordinary tin/lead solder (I've
done a lot of that) but it takes a very aggressive flux (rosin won't
generally do it.) These aggressive acid fluxes need to be washed off
when the work is done.
When dealing with nichrome, specifically, one tends to assume that
heating is intended, and that certainly would make braze the better
choice - though you might want to consider a purely mechanical
connection, too. Those require periodic cleaning and re-tightening, but
don't generally melt and disconnect.
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