Electronics Forum | Thu May 30 20:09:58 EDT 2002 | myu
Thank you very much, Dave and Steve. I got paste and wire from Indium and Qualitek. Are there anybody with high-temperature reflow experience (330 degree C)? Is it OK to use Regular Convection Reflow Oven (We have a Conceptronic HVC 70, 5 zones) ?
Electronics Forum | Wed Jun 26 13:30:41 EDT 2002 | Steve L
Thanks, guys. The solder paste we are using is a kind of prototype from Alpha Metal - more aggressive, long floor life, etc. The paste I used to solder PBGA was out of fridge for about 3 weeks. It was still good for our other Non-BGA products. Be
Electronics Forum | Wed Jun 26 21:31:42 EDT 2002 | ianchan
Hi mate, suggestion: consider "re-fridge" the paste after each Lot (small volume) batch run, instead of leaving it at ambient temperature for 3mths. follow FIFO control of such re-fridged paste. check with your supplier (in documented format reply)
Electronics Forum | Tue Jul 23 11:14:16 EDT 2002 | juan_ruiz
We are interested on measuring height paste as a control method in our production lines, We are considering using a Cyberoptics equipment but we perform a GR&R for this equipment and it didn't pass it. Do you know a better alternative to measure heig
Electronics Forum | Tue Jul 23 17:01:56 EDT 2002 | russ
Did you use the frame grabber software that is available for the LSM? I used one in the past and we also failed the GR&R we then installed this software and it became very consistant unfortubately I cannot remember who sells this software. Anyway,
Electronics Forum | Thu Sep 12 18:50:17 EDT 2002 | scottefiske
Sorry so late in getting into this tehcnical issue. I have seen this condition before...90% of the time in conditions of adhesion on a water soluble material... is the paste...exposure time, lot issue, etc..basically the paste's carriers and binders
Electronics Forum | Fri Sep 13 12:30:05 EDT 2002 | bobm
I have heard a lot of different stories about reusing solder paste. I take what is left on the screener at the end of the day (yes i try to watch the amounts that are put down)and transfer it to a clean solder paste jar. I would like to hear any inpu
Electronics Forum | Wed Sep 18 06:53:05 EDT 2002 | CH
1) For solder short, pls check the paste height. Too much vol will cause short. For 15 mils use 5 mils thickness stencil if possible. Check profile preheat time to prevent hot slumpof the paste. 2) type 4 powder will be better for 15 mils pit
Electronics Forum | Thu Nov 07 07:35:23 EST 2002 | cyber_wolf
If you are experiencing flux migration, try refrigerating your paste when not in use. This causes the flux viscosity to go up. I have seen flux seperate from the solder is when it is VERY old and out of date.Sometimes warmer ambient temperatures wi
Electronics Forum | Fri Nov 08 14:57:43 EST 2002 | slthomas
What I was told is that the stirring is intended to promote some shear thinning, not to redistribute the flux. The cartridges (and I'm assuming the syringes, too, if you're differentiating between the two) alledgedly introduce some shear thinning ju
