VPS using preforms is dependant on PCB thickness.
As usual with pin in paste or preforms the thinner the PCB the easier.

The ramp rate on heating can be very high for a few seconds.

Selective solder will work with a 2-4% solids flux. I use both alcohol and
water based.
Alcohol is preferred becasue of the type and amount of pre heating
available.
Typicaly only IR is availale, convection has shown up on some new machines.

It works for both mass dip and point to point soldering.


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