Electronics Forum | Wed Mar 01 12:28:48 EST 2006 | Chunks
Round cracks that look like it's from a placement are generally from a too big Delta T in wave (been there done that). All other cracks are anomalies. Ya gotta see it find it.
Electronics Forum | Tue Feb 28 21:15:08 EST 2006 | davef
Questions are: * What is the scale and scope of the problem? * What does the unfilled portion of the barrel look like? * What class of flux is your solder paste?
Electronics Forum | Wed Mar 01 03:39:10 EST 2006 | dave
Hi Davef, Basically there is very poor signs of wetting ,the hole fill from the top of the board is non-existant and we are using 63/37 solder bars (wave solder machine).
Electronics Forum | Wed Mar 01 09:56:15 EST 2006 | russ
I would definitely try a more agressive flux. Are you using a W.S. or No-Clean? And of course check the usual preheat temp flux application dwell time immersion depth
Electronics Forum | Tue Feb 28 19:46:07 EST 2006 | Rookie
We been having problem with raw PCB quality. Is there a procedure to inspect incoming material? What should we look for?
Electronics Forum | Wed Mar 01 03:29:12 EST 2006 | AMS
Hello, We want to purchase a used CSAM machine for our lab. Could anybody direct us a good source for this? AMS
Electronics Forum | Wed Mar 01 11:51:04 EST 2006 | ajaygarg1980
we are observing voids in solder ball bonding process using laser.Final metal finish is of Au on Cu.Can anyone tell me the reasons or solution for this problem.We are not using any flux at all.
Electronics Forum | Thu Mar 02 09:35:05 EST 2006 | patrickbruneel
85% are exempt from the RoHS directive. Doesn't make a lot of sense but that wasn't your question.
Electronics Forum | Thu Mar 02 16:33:53 EST 2006 | russ
Your best bet would be to browse through you current solder suppliers catalog and pick your alloy. Most of them have a list of alloys and their melting points as well as what form they can be supplied in.
Electronics Forum | Fri Mar 10 03:16:07 EST 2006 | Slaine
Multicore make a HMP alloy liquidus at 298 degrees, Pb93Sn5Ag2.Ive used it to attatch thermocouples but they're difficult to solder as they dont wet.
