Electronics Forum: no-wetting (Page 1 of 1)

Hitachy QFP 256 leads problems

Electronics Forum | Mon Mar 19 11:20:10 EDT 2007 | realchunks

When you say "No wetting" you mean the paste looks the same as it did going in but dried out? Or is it that you are not getting toe fillets?

Reflow issue with QFN

Electronics Forum | Thu Jul 05 15:13:46 EDT 2007 | joeherz

We've seen non-functional QFNs cured by touching up the toe fillets. Especially with parts that are not plated on the edge/face where you get minimal/no wetting due to oxidation of bare copper. I'm not suggesting that you touch everything up but th

Through hole pins not soldering

Electronics Forum | Wed Sep 23 00:06:34 EDT 2020 | SMTA-64387098

I have modules that come with a 4 x 2 pin header. The problem is the pins must be oxidized as they do not take solder (no wetting occurring). This occurs whether solder in our wave soldering machine or soldered by hand. I tried cleaning the module i

Re: Poor soldering on Motorola 357 PBGA

Electronics Forum | Mon Nov 06 10:52:52 EST 2000 | Glen Mantych

Glenn, we have been fighting perhaps the identical problem for nearly a year on a 1mm pitch BGA, we have performed numerous laboratory analyses of defective joints and virgin parts in an effort to specifically identify the cause of the no-wet joints.

QFP100 solderability

Electronics Forum | Tue Apr 15 03:16:14 EDT 2008 | janz

Hello, We are having a problem with soldering QFP100 (16mmx16mmx1mm). Board dimensions: 70mmx50mmx1.8. FR4 two layers � single SMT assembly. Finish: HASL-lead free Oven: 7 zones �hot air Paste: lead free We have noticed that two groups of legs

BGA non wetting

Electronics Forum | Mon Sep 13 22:32:41 EDT 2010 | genesan

Hi all good morning and need advice from expertise here. One of my customer complain that they have constantly issues with one of their product and ask us to do cross section.The report show there was “no wetting to the PCB copper pad” and cause the

BGA non wetting

Electronics Forum | Mon Sep 13 22:58:49 EDT 2010 | genesan

Hi all good morning and need advice from expertise here. One of my customer complain that they have constantly issues with one of their product and ask us to do cross section.The report show there was “no wetting to the PCB copper pad” and cause the

ENIG poor wetting

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

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