Too fast a ramp may damage neighboring components or the laminate. Then a “soak” phase, which lowers the ramp rate and starts to activate the flux, begins. After this phase, the liquidus temperature, somewhere between 205-220C is reached.
A student’s entry pattern and leave details or logging out early would be visible to the school authorities to bring the student back to the rulebook. This begins the reflow zone. In this, the maximum temperature is reached and the rework location “sees” a temperature which is above the liquidus temperature for a minimum of 60 and as long as 90 seconds.