Electronics Forum | Fri Dec 02 08:52:05 EST 2005 | pavel_murtishev
Good evening, I�ve just solved very similar soldering issue. In my case the problem was with 0603 chips. Solder joint had same appearance. I suspected that solder do not melted and increased TAL and peak temperature. No result. Next thing I tried to
Electronics Forum | Fri Dec 16 11:04:23 EST 2005 | chunks
Over all time will be dictated by your conveyor speed. Your conveyor speed will be dictated by your products time above liquidous. Time above liquidous is dictated by the manufacturers specification. Time and temp before reflow will have to be ach
Electronics Forum | Tue Mar 28 17:10:25 EST 2006 | mikecollier
I unfortunately cannot post any photos, the unit in question is classified. And, as far as my comment that the BGA profile can be manipulated, if an engineer is also working the process with one of the operators, they can override the profile at any
Electronics Forum | Fri Feb 16 11:37:58 EST 2007 | hectorsmtnet
I have been using the Loctite Multicore WS200 with great results for the last two years. We also use the lead free version WS300. I like the flux chemistry (which is the same for both products); it really withstands long soaking times and with very g
Electronics Forum | Wed May 10 08:41:19 EDT 2006 | russ
Yes, we added some soak, we also use a 5 zone oven. We utilize a .020" x .020" pad with center to center at .042". We only get tombstones on misplacement or bad paste release now. Registration of component is key with pbfree, the parts just don't s
Electronics Forum | Fri Jul 28 09:40:11 EDT 2006 | pavel_murtishev
Good afternoon, 1. Yes, most of all I suspect the components. Could you explain what does mean "reflothermal recipe"? Ramp-to-spike? Ramp-soak-spike? Something special? Thanks. 2. Void is really huge. This voiding differs from "standard" voiding ef
Electronics Forum | Wed Aug 09 11:45:25 EDT 2006 | SWAG
We have an OmniFlo 7, 2000 vintage reflow. We are having conveyor problems. I checked the encoder and speed control board and everything is good per tech. manual operations. We removed the chains a couple months ago and thoroughly soaked/cleaned t
Electronics Forum | Wed Aug 16 13:29:51 EDT 2006 | SWAG
Is 811 lead paste? If so, it seems to me that your oven settings are getting into soak awful fast in zone 2 and your peak is way high. Unless you are doing a thick board or something like that, those oven settings seem aggressive and might result i
Electronics Forum | Thu Oct 05 16:03:31 EDT 2006 | C.K. the Flip
I had horrible experiences with a certain brand on multiple types of BGA's (I choose not to mention the brand). The paste was nice and active, but almost to a fault when it came to BGA's. Finally, I arrived at a profile with a more agressive ramp u
Electronics Forum | Wed Jan 10 17:08:12 EST 2007 | mscalzo3
Brian, There are a couple of ideas that you can use for this. Slowing the ramp is the first one that comes to mind. I would try soaking at about 10 degrees "C" below the solidus of the alloy for about 45-60 seconds. Slowing the ramp to remove the