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People otherwise attending:
Reflow soldering workshop
not teaching, but testing this technique
* Aoyue hot-air station
* pizza oven + [http://www.sparkfun.com/products/81 sparkfun reflow controller]
* solder paste
* test circuit boards
[http://www.onsemi.com/pub/Collateral/SOLDERRM-D.PDF Solder profiles and background info]
= Initial heater test =
= Programs used=
0 15s 40°C
1 150s 150°C
2 90s 215°C
3 90s 265°C
4 40s 265°C
5 120s 40°C
= Final profile =
Comparing this profile to the 'ideal' solder profile, the main difference is that we do not dwell on the 'pre-heat' phase (ie. 150-200°C). This is because we could not get the temperature to rise fast enough, so we were forced to stick to a steady, slow ramp.
= Results =
[[File:Smd_reflow_soldered_resistors.jpg|thumb|center|The second run of 0603 resistors was a success]]
[[File:smd_reflow_soldered_ics.jpg|thumb|center|Some very fine pitch ICs]]
The results of the final profile were excellent. The main restriction of this technology is the precise application and dosing of the solder paste, and the placement of the components. We will experiment with using stencils next time. This should improve success rate significantly.
This is a minor edit
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