| Electronics > Beginners |
| Copper bar soldering problem |
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| jmelson:
--- Quote from: s3rkan on May 21, 2018, 04:00:35 pm ---Hello everyone. I have just received this copper bar from AliExpress: http://s.aliexpress.com/3iQrQFBz I want to make a mosfet switched spot welder and will use this bar for mosfet drain and source. But even I have tried all I have, like soldering paste, Flux, grinding the surface and HCl, I couldn't make stick the solder to the "copper" bar. I tried it between 320-350 C degrees. Does any one have any idea what I am doing wrong? --- End quote --- No electronics soldering iron can possibly solder to this type of bar. You need either a "plumber's" soldering iron with 100 - 200 W or a Weller-style soldering gun (transformer-type). I have used those tools to solder to bar like that, and it demands the full output of these high-power irons to heat the copper enough to make proper solder joints. Jon |
| Jwillis:
Drill holes in the copper, tap some threads.solder eyelets on the mosfets and screw them on to the copper bars.Minimal heat required.Simple chip replacement . |
| GerryBags:
I have one of these cheap butane irons for soldering to thick stuff. I've used it to solder heavy guage earth cable to an A4 sized 2mm thick copper sheet without any difficulty at all. It can make a fine flame that you can be fairly precise with too. |
| JS:
--- Quote from: Jwillis on May 21, 2018, 11:04:04 pm ---Drill holes in the copper, tap some threads.solder eyelets on the mosfets and screw them on to the copper bars.Minimal heat required.Simple chip replacement . --- End quote --- Something like that was my first thought, I don't know if I'd even try the soldering. I don't know your mosfets, but they might have the drain connected to the tab, there goes your screw, now you have to cool the bar, or make the heatsink the bus. JS |
| cncjerry:
--- Quote from: Jwillis on May 21, 2018, 11:04:04 pm ---Drill holes in the copper, tap some threads.solder eyelets on the mosfets and screw them on to the copper bars.Minimal heat required.Simple chip replacement . --- End quote --- use this ^^^^^^^ or low temp solder. |
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