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The following image shows the heat distribution of a PCB after reaching peak temperature. It is difficult to see the temperature across the board, possibly because of the high difference between the temperature of the board and the temperature of the surroundings. The angle of the camera also greatly affects the temperature readings so the hot spots on the left are likely not actually there, and the actual temperature of the board is much more accurately determined from the thermocouple plots above.
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Profiles
Leaded Solder Paste
Current Profile:
Preheat: 150C 30s
Heat: 175C 20s
Solder 210C 3s
Keep: 205C
Cool: 70C
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Preheat: 130C 30s Heat: 183C 20s Solder 220C 5s Keep: 180C Cool: 100C This resulted in burnt and deformed Molex ultrafit connectors. |
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The 60-pin mezzanine was fine. |