Electronics Forum | Mon Aug 25 19:27:11 EDT 2008 | Mike Konrad
There are a number of �low cost� stencil cleaners available. I am a manufacturer of one but I'll list a variety and let the others provide editorial on which is best. Basically, there are three technologies, manual cleaning (solvents and wipes), ul
Electronics Forum | Mon Aug 25 14:55:51 EDT 2008 | grics
I have a question for the manufacturing masters... We are going to start running test trials/DOE of a Urethane Coating (Humiseal 1A33) and I am not sure what to expect. From what I understand, urethane coating is pretty difficult to work. It is supp
Electronics Forum | Wed Aug 27 14:19:40 EDT 2008 | grics
Have you given this information to your paste manufacturer???(Profile, Pics of defects?) The profile seems to look ok(without knowing paste info...) I think the ramprate looks a little aggressive but it could be the scaling of the profile and the i
Electronics Forum | Wed Aug 27 14:38:20 EDT 2008 | rgduval
Does your paste provider recommend a TAL? For the leaded and lead-free pastes that we use, the manufacturer recommends 60 seconds above liquidous. I note that your profile shows the TAL as 30 seconds, which may not be sufficient. That said, tho
Electronics Forum | Thu Aug 28 08:43:56 EDT 2008 | rgduval
You wouldn't think that placement would affect dewetting or solderability....I wouldn't have either, until it was the only thing left in our process, and when we changed it, things got better. I couldn't begin to explain why, either. The only concl
Electronics Forum | Tue Sep 02 15:29:36 EDT 2008 | bvdl
small pads like 0402 tend to get hot quite easily. looks like excessive heat is your problem here. pads are wetted, component leads are not. this means solder paste flux on top layer was exhausted before entering in reflow. your profile is the 'in-be
Electronics Forum | Mon Dec 15 15:34:17 EST 2008 | dyoungquist
Sorry it has taken me so long to respond. I got pulled off onto other projects and was not able to work on the solution to the problen until recently. The solution we have come up with is to change from no-clean flux based solder paste to water sol
Electronics Forum | Thu Aug 28 07:32:06 EDT 2008 | realchunks
I've been there. Soldering no lead parts in a leaded world can be difficult. Sounds like you are not wetting to your parts becasue you ar enot getting hot enough. Here's the trick - you can turn up your profile to look like a no-lead profile, and
Electronics Forum | Thu Aug 28 11:15:05 EDT 2008 | omid_juve
I've been there. Soldering no lead parts in a > leaded world can be difficult. Sounds like you > are not wetting to your parts becasue you ar enot > getting hot enough. Here's the trick - you can > turn up your profile to look like a no-lead
Electronics Forum | Thu Aug 28 16:18:55 EDT 2008 | realchunks
So just send a board to your company and that's root cause analysis? LOL... Ok sure. I guess I'm too much of an engineer and like to get to root cause by eliminating all the question marks and double checking my findings. Part of THAT kind enginee
