Electronics Forum | Tue Jul 30 08:37:39 EDT 2002 | davef
When you talk about 'poor wetting', 'dewett', 'no wets', etc.; are you seeing solder pulling back or away from the pad? Please describe the condition. Dewetting. The condition in the solder joint in which the liquid solder has not adhered intimate
Electronics Forum | Tue Jul 30 17:47:50 EDT 2002 | davef
Dewetting: Solder does not adhere to lead or land, caused by: * Poor solderability of lands. * Poor solderability of leads. * Solder paste integrity. * Lead plating integrity. Need more information, please: * What is dewetting [ie, component, pad, e
Electronics Forum | Tue Jul 30 17:51:18 EDT 2002 | davef
Comments are: * Peak at 245�C for 40 sec seems like a very long time. I�d expect the time at 245�C to be 10 to 15 sec. This long time at peak could dewett the pads. * Really, their 2D vision on the printer can verify solder presence? * A thin coat
Electronics Forum | Wed Jul 31 08:23:49 EDT 2002 | mcm4me
221C). 2D vision can very effectively detect % pad coverage, I use it on my DEK and this customer has an MPM which I also believe to be capable. Here is another fact, when the customer uses Brand X solder paste the defects due to what they call pad
Electronics Forum | Wed Jul 31 17:25:39 EDT 2002 | sueph
Dave, thanks for the reply. These boards have metal plating covering 99 percent of both primary and secondary surfaces. The only places without the metal plating are the extreme outer edges and about an 1/8 inch surrounding the plated holes. We do
Electronics Forum | Fri Aug 02 11:48:23 EDT 2002 | johnw
I can't think of any off hand other than the Ersa which is massive and from when I used it a pain in the A*SE to program and keep programmed, you always seem to have to baby sit it. I bet if you asked you could get one, the problem is that forced con
Electronics Forum | Thu Aug 01 12:55:41 EDT 2002 | johnw
we run the paste in both air and n2 depending on customer requirements again it run's fairly well in both. Some people say it's better sme say it doesn't make a bit of difference, I'm somewhere in between at the moment. I definately think there's imp
Electronics Forum | Wed Jul 31 19:30:54 EDT 2002 | AXRT
Looking for partner & sponsorship Ladies and gentlemen, I am looking for serious partners, willing to support me and to cooperate in the realization of two projects in the area of implementation of modern X-ray techniques. Both projects will place
Electronics Forum | Wed Jul 31 19:45:23 EDT 2002 | AXRT
Ladies and gentlemen, I am looking for serious partners, willing to support me and to cooperate in the realization of two projects in the area of implementation of modern X-ray techniques. Both projects will place on the market some new, very attr
Electronics Forum | Sat Aug 03 08:44:11 EDT 2002 | P. Kannan
We are having 3 MPM UP-2000 printer & 1 AP-25 printer with us. I would like to have the technical guidance for my following application. For one of our model, there is a requirement of Glue & solder paste on same side of the PCB. Currently we are u
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