HowToDragSolderSMD.mov
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- Опубліковано 29 вер 2024
- Short video demo showing how to drag solder a .5mm pitch IC (FTDI 232rl in this case) using a Weller NTGW tip(2.0mm) running at 650 degrees. Flux used Kester 2331-zx 10 ml pen.
The process is simple, assuming IC is positioned correctly simply apply plenty of flux, tin and clean tip. Then fill bevel with solder and drag at a steady pace gently over the pins, this allows the solder to flow to each pin making a nice even fillet.
Once finished clean up with distilled water or isopropyl alcohol depending on flux type.
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I hope you cleaned the board a bit better than just dabbing it with a cloth, that 2331-ZX is acid-based flux and can cause corrosion if you leave it on the board.
Very good technique! Amazing how no solder bridges are leftover. Great work!
Thanks for the kind words, I thought you might find it helpful. Looking forward to seeing you use it!
Clean!
@keyvleon The surface tension of the solder, combined with the temperature difference between the hot and cool pins makes the solder transfer in such a way that only the "right" amount is deposited on each pin.
This is similar to beads of water and the trails that they leave(the bead maintains its general shape). The pocket of hot solder creates the bead, while the cool pin heats, a tiny bit of solder is left in a "trail" and the excess is pulled back by the surface tension.
@arakis83 Weller WMP pencil on a WD station, but they have a wide range of tips for most of their major lines. I think they all have a GW in those lines as well.
I actually clean all the boards after I finish them with a mixture of rubbing alcohol and acetone(50/50, the store bought alcohol is fine for this). I think Jerri has a video on this mix, its the best I found for doing a final clean and even removed the thicker rosin flux from the flux core solder.
I have noticed some tarnishing on contacts even with the 3221-zx after long periods, since its a fairly easy step I clean it all off anyway!
@Toolfriend Glad you enjoyed it, and I hope it makes the rounds!
(On a side note Love the tools and service keep up the good work(Weller, Reps,TSMs and all)!! I wish I could play with half the stuff you guys got :)
Thank you!
@Microman171 Thanks for the kind words! I just though I could add something to the discussion and decided to pitch in!
Noting the Kester 2331-zx flux, its a water soluble flux meaning it could be cleaned off with water. Since its non-corrosive is there a need to clean the board by rinsing it in water after you're done or could it be left on the board with minimal consequences?
I ask because after I'm done with a protoboard I usually desolder the test chip and reuse it, solder intervals many last as short as a couple hours or as long as a couple months. Theres no need in my opinion to reapply flux for short times
Oh wow! Enjoyed this, thanks!