Electronics Forum | Thu Aug 28 21:43:23 EDT 2008 | davef
Couple of points: * We'll tell ya, although it's tough to tell from these pix, but it does not look like dewetting. It looks like nonwetting. * We don't think you're getting this product hot enough. We don't know where you measured the profile you po
Electronics Forum | Fri Jan 30 04:10:10 EST 2009 | sachu_70
Hey Daniel, N2 gas provides an inert atmosphere which help to minimise oxidation, generally a concern across the reflow zone. Although N2 provides a more shiny solder joint, it is certainly more of a cosmetic issue and does not certify joint reliabil
Electronics Forum | Mon Jun 01 17:41:20 EDT 2009 | gregoryyork
What is your squeegee pressure and size. Also does the pad sit on a ground plane, as it looks like it is partially reflowed so surface has gone but not coallesced properly which would indicate it is more a problem with reflow above 217-219C OR obviou
Electronics Forum | Wed Jul 29 10:46:04 EDT 2009 | babe7362000
I was wondering if anyone knows the best way to clean oxides off of fine pitch components? Apparently the paste we use does not have strong enough flux to remove the oxides off of the leads of the components. I have validated the profile and that i
Electronics Forum | Wed Aug 19 18:18:02 EDT 2009 | smt_guy
Thanks Sir Dave. Yeah my apologies. To clarify, we built the product PCB whcih has a Lead-Free HASL Finish using a Sn63/Pb37 Solder paste. My major concern regarding reliability is that my profile whish is between 215'C-225'C was insufficient to ref
Electronics Forum | Thu Sep 03 04:53:31 EDT 2009 | d0min0
to summarize - 3 components are placed on a single module x 8 on pcb - 2 anodes & 1 cathode are infected (so no component for us) - the problem does not look like wetting problem as the component and land pad is wetted, but the paste is not complete
Electronics Forum | Thu Apr 01 14:43:26 EDT 2010 | cbart
You say its in both smt and through hole, but, are you waving the SMT parts as well, I assume yes since you think its dross in the joints. Questions: 1- do you have higher mag scopes that you can zoom in a little more to see if these are voids or dr
Electronics Forum | Fri Feb 24 02:04:50 EST 2017 | soldertraining
Selective Soldering Frames can pull large amounts of heat from the solder wave at the point of contact, effectively lowering the temperature of the solder at the solder joint. You should confirm the temperature of the solder joints by running a therm
Electronics Forum | Sun Mar 25 08:45:00 EDT 2018 | jacobidiego
Normally some random components of size 0604 or below and may be due to a thermal mass being close like a transformer or AC electrolytic caps. We tried changing fan speed, but this will change the thermal profile and avoid the thermal mass from bein
Electronics Forum | Wed Mar 27 13:47:24 EDT 2019 | whitelancer64
I am having an issue with aligning vision for solder paste inspection with the PCB in the Momentum machine. The SMT operators setup the profile on the machine, which I then import into Aegis CircuitCAM to add PCB locations. But when I export again, t
