Electronics Forum | Thu Aug 19 05:19:31 EDT 2010 | grahamcooper22
I have seen that moisture in pcbs will cause mid chip solder balls. To discount this, take one pcb from a batch that is giving you solder balls and pass it through you reflow oven with no paste or components on (bare pcb)using your normal reflow prof
Electronics Forum | Thu Aug 29 20:02:58 EDT 2002 | davef
Often assemblers leave areas unsoldered for future component additions, modifications, and test points. On imm silver boards, these unsoldered areas become a real bear to solder/test later in life. One way to avoid that problem is deposit some solder
Electronics Forum | Tue Jan 13 22:43:11 EST 2004 | davef
We have seen this in reflowed parts, where there is flux res collected in the dimple in the solder, where the lead 'presses' in the solder. Generally, we attack this as a thermal issue: * Thermal pads sucking the heat away from the leads. * Leads no
Electronics Forum | Sun Jan 11 20:38:41 EST 2004 | TerryH
Dave, Good to hear about VITechnology. Youre right about flexibility to deal with component variation. We have had problems with different batches causing rejects. When you say Omron for solder, do you mean solder paste or reflowed solder joints ?
Electronics Forum | Tue Jan 15 08:50:07 EST 2008 | ck_the_flip
Based on past, actual, hands-on experience, I have found that the PCB mask finish makes a HUGE difference in solder-balling. Glossy has different surface tension and peelback characteristics than matte finish (ie glossy sucks). http://circuitsassem
Electronics Forum | Sun Aug 16 16:01:06 EDT 2009 | davef
White, lead free * Taiyo America PSR-4000 LEW1 * Huntsman (formerly Vantico, formerly Ciba Geigy) Probimer 77 white solder mask Also, search around LEDs Magazine [ http://www.ledsmagazine.com/ ]. White solder masks are often used as a reflective ba
Electronics Forum | Mon Nov 25 11:15:11 EST 2013 | richinmx
HI GUYS ONE OF MY DURING THIS YEAR IS TO DEVELOP A COST MODEL FOR SOLDERING (RAW MATERIAL, CAPITAL INVESTMENT AND LABOR BASICALLY). AT THIS MOMENT MY ROAD BLOCK IS RELATED TO THE SOLDER PAD SIZE. IF YOU CAN HELP ME TO GET INFORMATION ABOUT THE DESIG
Electronics Forum | Wed Feb 08 03:24:00 EST 2017 | soldertraining
Tin dipping of components in RoHS compatible solder is one means to turn the lead bearing components in to devices which can be used in a RoHS compatible soldering process. The conversion of lead bearing components into those which can be used in the
Electronics Forum | Mon Feb 22 23:09:21 EST 1999 | Chris G.
| I'm a 19 Year old singaporean student. | I need to do a report on solder paste dispenser. | i've search the net but to to avail. | Please help if you know anything about solder paste dispenser or have any info and pictures or charts of solder paste
Electronics Forum | Fri Feb 22 16:49:44 EST 2008 | pms
Steve, Trying to keep wave solder from coming up the via' from the bottom and adhering to the via's and via's pads during wave. We use WS flux thru-out the whole process. I have been concerned about possible flux intrapment in the via's. That's a g
