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Yep, I heated the bus bar, and stick the mosfets on, and as soon as the middle leg (connected to the back of the mosfets) gets to solder temp, I submerse the bus bar in water. The whole process only takes maybe 6 seconds, and the bar is less than 500 degF. The datasheet says the mosfets' legs can be at 500degF for 10 seconds, but it says nothing about the back metal heatsink. The diodes have never failed. I think you are right about preheating the mosfets too.
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