@eneuro:
Just to avoid confusion, what do you mean when you say "brazing"? Essentially the same thing as soldering, but with higher temperature melting point for the filler material? Or something different that I am not aware of?
Because you mention "brazing using spot welder"? Wut? How does that work?
At any rate, as far as I am concerned for a direct join of the metal tab of say a mosfet to a heatsink:
- spot weld ==> noooope, crap cross section ==> poor conductivity
- brazing ==> noooope, high work temperature ==> high risk of killing semiconductor
- soldering ==> yup
That is not to say that I would pick soldering over boring old clamping, but it is to say that I would pick soldering as the prefered method out of the above three choices.
Unless I am missing something, in which case please explain.