Electronics Forum | Thu Jan 13 10:30:14 EST 2011 | SheanDalton
My recollection is 6 degrees; but, I suspect the type of wave formation on the backside has an effect. Here's a few notes from an old fishbone chart: Too low angle: excessive solder, icicles, bridging High angle: insufficient solder, voids or outga
Electronics Forum | Thu May 10 16:11:46 EDT 2012 | comatose
I have a rarely used Wenesco that's about 4 years old that I would be willing to get rid of. Its filled with lead free solder. We just bought a full size automatic selective solder machine which arrives next month, so we'll go from using it once in
Electronics Forum | Wed Jan 26 17:36:22 EST 2011 | ck_the_flip
had a quick question regarding compatibility of Sn100C HASL finish and regular Sn63 solder paste. Does the thermal profile have to reach Sn100C eutectic temps. in order for the Sn 100C HASL to coaelesce with the Sn63 Solder paste? How reliable is t
Electronics Forum | Tue Mar 08 02:28:03 EST 2011 | nagesh
I have an issue with PLCC Insufficient Heel solder joint fillet.The aperture dimension is : 30 x 100 mils on PCB & on stencil also(1:1 per gerber).Rohs Process. My stencil thickness is 5mils due to presence of Tssop & QFP package & i cannot increase
Electronics Forum | Fri Mar 25 05:33:18 EDT 2011 | Nigel, RAKON
We have the occasional solder fine but the main issue I have is with small - large balls of solder around an 0402 capacitor. Our LF paste data sheet states a %rH of 25 - 70, I have recorded an average for March of 14.9 - 38.5 %rH. Every other requirm
Electronics Forum | Wed Jun 01 10:33:18 EDT 2011 | tzhangaclara
Hello, Attached is the X-ray picture of a SMT transistor. Please give me your opinion whether this is a good solder or not. From my view, I did not see any solder in the middle pad. I feel it is a production problem. But someone told me unless you s
Electronics Forum | Thu Jun 02 13:32:05 EDT 2011 | davef
Melanie: We're with AVFOM. If you don't believe there is solder on the pads, use a beer can opener to pop the component off the board and you will have your answer. Easy-peasy. Who ever told you 'if there is solder, there is voids' in solder connect
Electronics Forum | Thu Jun 23 23:58:03 EDT 2011 | jamessunderland
Just want to ask. What is the effect of dull gold surface on solderability? When I made a test run with several pieces containing dull gold defect on the pad(of varying levels), I found that components can still stick to the pad with good amount o
Electronics Forum | Fri Jul 08 08:01:32 EDT 2011 | joekirin
Hello, I am having a problem with a large amount of solder balls surrounding mostly the legs of fine pitch ics. There seems to be a large collection in gap between the pad and the solder resist. They do not easily wash out. Our profile seems to be
Electronics Forum | Fri Jul 08 10:21:21 EDT 2011 | davef
OK. You used a thermometer to to check your recipe. How do know that the temperatures that you selected are correct? Your solder balls indicates that it's possible that the temperatures that you selected might not be correct. Without belaboring an
