Electronics Forum | Sat Apr 11 09:56:31 EDT 2009 | davef
You're correct. You should expect to see an intermetallic layer in a proper solder connection. Try leaving the component at temperature for a longer period. Growth of intermetallic compounds on Cu surfaces [Klein Wassink]: d = 10^3(exp(-5*10^3/T)t^1
Electronics Forum | Sat Aug 01 04:45:43 EDT 2009 | hohk
Thanks on the advice isd.jwendell! Yes, the piezo ceramic has a Curie Temp of about 800C, so its safe operating temp should be around 300-400C. How about if my PCB is a prototype, would it be more economical to use hand soldering or just manually app
Electronics Forum | Thu Oct 29 21:16:15 EDT 2009 | mah115
Fellows, We are considering getting an AOI machine to inspect boards that our vendors are giving us (we outsource the assembly of PCBAs). We have low volumes of boards, but every time a defect does slip by our human inspectors, it causes a lot of
Electronics Forum | Thu Dec 10 05:58:59 EST 2009 | gregoryyork
Best to use Tin treated with TinP Additive. This ensures the Tin is fluid enough to Dissolve any Leaded residues. Run the machine for one hour at 275C then take out wave former and as much of the workings of the pot as possible. Then start bailing ou
Electronics Forum | Mon Dec 28 08:51:45 EST 2009 | jax
What solder are you talking about and what reflow method are you using? High Melt Alloys: SN96 (Sn96/Ag4 or Sn96.5/Ag3.5) - Simliar to SAC305 although normally uses Rosin based flux that can required more extensive cleaning. Pb85 (Pb85/Sb10/Sn5) -
Electronics Forum | Mon Jan 04 15:40:31 EST 2010 | dilogic
We recently got a job where (after placing SMT parts) we have to solder LED dot-matrix 8x8 display modules manually on the pcb. Due to the PCB design, it has to be TH type (also, it's the only type available) and soldered manually (or using selective
Electronics Forum | Mon Mar 08 05:03:24 EST 2010 | grahamcooper22
Hi, I fully agree with isd.jww. The difference in the solder joint appearance of the 2 joints highlighted could be down to a few reasons...reflow profile (I know you've checked, but have you stuck a thermocouple on this actual joint ? ), contaminatio
Electronics Forum | Mon Apr 19 10:52:05 EDT 2010 | esca
Hi, if you want to verify the gold contamination, is mandatory to use the XPS and FTIR analysis, but is difficult think about a gold contamination from 3 different manufacturers. Do you have cleaned the PCBs after an erroneous screen process ? If no
Electronics Forum | Thu Sep 16 13:12:43 EDT 2010 | gregcr
Hi All, We have been running a Novastar spartan 8S wave solder machine for a number of years. We actually do very little wave soldering and this machine has served us well. I have always been of the opinion that with the small pot and simple fluxe
Electronics Forum | Tue Nov 09 04:21:11 EST 2010 | bising
Hi SMT World, I am facing a technical challenge related to an SOIC 14lds with thermal pad on it's belly that needs to be soldered onto PCB, together with leads. It is a 50 per board, expected 80% solder load on every one. We have some units without
