All component suppliers provide specifications for thermal shock for
parts rated for wave soldering. Check with them if you are concerned
about reliability. The same rated part may be 100 C for one supplier,
125 C for another and 80C for a third. There are other preheat
requirements you also should meet.
As for selective fixturing, it again goes to part requirements. If you
must wave solder parts not rated for wave (ex. BGA), reflow and
selective solder, if you are doing wave solderable parts, why pay for
selective solder fixturing.
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Subject: [TECHNET] WAVE SOLDERING SMT CHIP COMPONENTS
Author: Alan Kreplick <[log in to unmask]> at INTERNET