Electronics Forum | Wed Aug 15 01:46:43 EDT 2001 | Pavel
Hi, could any body tell me the reason for solder beads apperance and how to aliminate them (solder beads are solder balls that are found along chip body). Thanks,
Electronics Forum | Wed Aug 15 08:16:29 EDT 2001 | wbu
Hi Pavel, what you see is most probably caused by to much solder. There�re plenty of hints to avoid this in the archives, just use the "search" function and look for "solder beads" and "solder balls". That will bring you on the right track. Good lu
Electronics Forum | Tue Jul 06 08:10:34 EDT 2004 | yukim
The manufacturer confirmed that it is humidity - the solder paste is too sensible to humidity. Now I tried Koki solder paste with good result. But, it does leave flux residue in good quantity. Does anyone have experience with Koki solder paste?
Electronics Forum | Sun Sep 09 16:03:50 EDT 2007 | davef
Wave Optimizer-person Help us understand how your "excellent wave solder guide called 'Take No Prisoners' that includes instructions for attacking and eliminating solder balls and preventing their recurrence" will help Joris resolve his / her issues
Electronics Forum | Fri Sep 05 13:49:04 EDT 2008 | gregoryyork
Tell the board shop to increase the cure temp of the resist as it is undecured especially if you have waxy/greasy resiues on the board and a brown tar like substence in the solder wave itself. If undercured then solder will not flow off the resist pr
Electronics Forum | Wed Feb 16 09:19:22 EST 2000 | MARK ALDER
Please check Circuit Assembly March 1998, article "Solder balls and aperture shapes" and August 1999 "Guiding stencil design". They can be contacted at www.circuitassembly.com The main cause of mid chip solder balls is the volume of paste that is p
Electronics Forum | Tue Apr 04 07:46:03 EDT 2000 | Donnie
Neil, We currently use only visual inspection with a magnified lamp and actually brush the board after the wave process to help knock off any solder balls. You wanna use an ESD sensitive brush material. Camel hair is what we use. It works real wel
Electronics Forum | Mon Feb 19 11:36:39 EST 2001 | billschreiber
Hello Mark, I wish it were that simple so I could direct you to a particular manufacturer and stencil cleaner model. Unfortunately, there are several issues complicating the process of cleaning all these applications in one machine. First and fore
Electronics Forum | Mon Apr 15 19:01:53 EDT 2002 | Shawn
We have been getting solder balls on some of our SMT boards that are scattered across the board. We are using AIMS RMA291 in a cartridge. The profile we run matches what is called out on the tech data sheet for the solder with only the soak time mayb
Electronics Forum | Thu Jan 24 19:57:40 EST 2002 | davef
Are there formalized standards for the properties of solder balls? No Get IPC-7095 �Design & Assembly Process Implementation for BGA's�. General comments about array package solder balls are: * Ceramic packages use harder solder, like 90/10. * Pla
