Electronics > Projects, Designs, and Technical Stuff
DC load using a CPU cooler
Mr.B:
Thanks, I will investigate them as an option.
I was after something with a solid copper face so that I can solder the FETs directly to it.
The removable copper face on the water cooler is attractive because it will have lower thermal mass while soldering.
eneuro:
--- Quote from: metacollin on October 02, 2014, 07:39:10 am ---@eneuro and the other guy talking about welding/brazing:
I would discourage anyone from spot welding copper for thermal purposes, and even more so actual IC packages to copper.
--- End quote ---
Heating those IC units by classic soldering or putting them to ovens is thermaly better? :-DD
Haven't got a chance to test spot welding IC taps with brazing yet, probably next week while my buffy spot welder should be ready and tested this week after upgrade to 25A SCRs in pararell on its primary and just developing its software to add support for brazing mode :-/O
mrflibble:
--- Quote from: eneuro on October 08, 2014, 07:31:25 pm ---
--- Quote from: metacollin on October 02, 2014, 07:39:10 am ---@eneuro and the other guy talking about welding/brazing:
I would discourage anyone from spot welding copper for thermal purposes, and even more so actual IC packages to copper.
--- End quote ---
Heating those IC units by classic soldering or putting them to ovens is thermaly better? :-DD
--- End quote ---
The issue is the cross section of the resulting thermal interface. Spot weld ==> smaller cross section (compared to soldering) ==> poorer thermal conductivity across that thermal interface. Anyways, it has already been explained pretty well earlier on in the thread.
Jeroen3:
--- Quote from: NiHaoMike on October 08, 2014, 06:42:52 pm ---If you're looking for great cooling in a small heatsink, look at rack server heatsinks.
--- End quote ---
There are plenty for sale on eBay of recycled servers.
eneuro:
--- Quote from: mrflibble on October 09, 2014, 03:21:22 am ---The issue is the cross section of the resulting thermal interface. Spot weld ==> smaller cross section (compared to soldering) ==> poorer thermal conductivity across that thermal interface.
--- End quote ---
This is not in the case when brazing method is implemented.
Spot welder is only used to create huge short pulses to join copper areas by brazing, so it is simply source of high energy released in short times and those two surfaces should get soldered, but not by heating everything around including semiconductors chips.
Withput brazing it could be simply not possible join together copper metals without huge currents while it has very low resistance and very good thermal conductivity.
I hope it will work, then will tell more after experiments are made, but I do not dismiss it until tests are done.
Without brazing it couldn't have any sense to play and melt even with 1mm copper TO220 taps.
Tips for Soldering and Brazing Copper Tubing
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