Electronics > Repair
Solder IGBT on thick aluminium PCB. Hot air station suggestion?
_Emil:
--- Quote from: mikeselectricstuff on September 28, 2024, 08:54:52 am ---
--- Quote from: _Emil on September 28, 2024, 08:44:23 am ---
--- Quote from: mikeselectricstuff on September 28, 2024, 08:34:25 am ---For ali. PCBs you really need a hotplate
--- End quote ---
Thanks! Would a "946C" one work? How would i use it when installing new IGBTs? Preheat with hotplate and use hot air to bring the solder up to melting point? :)
--- End quote ---
yes - I have a 946C and it works fine.
No need for hot air
Just put plenty of flux on, prepare the new parts with leads formed and flux on them, maybe a bit of solder paste on the tabs - hotplate it til the solder melts, pick off the dead ones and plop the new ones on.
(When heating, it helps to push the PCB down onto the plate in the area to be reworked with a small screwdriver, though probably less of an issue with ali. than FR4.)
Then slide if off the plate to an adjacent metal plate & let it cool.
As regards temperature, probably better too hot than too cold, so you can get it done quickly - guessing around 300C
The thing about a hotplate compared to hot air is that with hot air, it always needs to be hotter than needed due to losses, so some parts are likely to get overheated. A hotplate just needs to be hot enough to melt the solder , and nothing will get hotter than the plate temp.
If the board has conformal coating then it would be good to remove it with a solvent first if possible- not impossible without doing it but could get smoky and smelly as the coating burns off.
--- End quote ---
Thanks again, it worked really good using hotplate. I did remove most coating using acetone. Now my welder seems to be working again, it did power on ;D
T3sl4co1l:
For heating big boards and metal parts, I make an ersatz oven with high-temperature blankets. (I have some fiberglass batting here, which, isn't exactly the most convenient and pleasant choice, but welding blankets, woven fiberglass, nomex, etc. would be recommendable.) Even just putting parts on insulation on the table, helps a lot, and further with insulation draped over extended areas of the board (around where you're soldering).
If a hotplate is available, it's an excellent choice for something like metal-core.
Tim
Navigation
[0] Message Index
[*] Previous page
Go to full version