Electronics Forum | Fri Apr 18 15:38:22 EDT 2008 | ck_the_flip
Do you have a picture? SMTNet HAS the technology now to post pictures. "Disturbed" to the typical Q.E. usually means grainy or dull, or a wrinkly solder appearance. All of this has to do with the "grain structure" of the solder joint. Here's a p
Electronics Forum | Wed Apr 21 22:15:12 EDT 1999 | Chris
| I'm having problems with trying to get a good solder joint using a Ceramic PCB. We are using AMTECH hi-temp solder (ws-486 96.5/3.5ag). My profile looks great and I used the recommended profile from Amtech with a few adjustments. My max temp is abo
Electronics Forum | Tue Feb 03 06:52:45 EST 2004 | paul_bmc
About 2 years ago our company tried to go with a post reflow AOI inspection. This AOI was suppose to be able to inspect to a level class 3 product. **It is impossible** You cannot inspect for a heel fillet and inspecting for poor wetting is a very
Electronics Forum | Sat Apr 14 09:28:58 EDT 2007 | davef
When soldering a component to a board, the solderability protection on the component combines with the solderability protection on the board and the solder to form an alloy. This alloy is unique for that combination of solder and solderability protec
Electronics Forum | Fri Apr 29 14:16:16 EDT 2011 | ppcbs
Below is the long explanation. This defect is most commonly found with BGA components, but can arrise with all components. I see it happening more now with lead free boards that are being assembled with a no clean flux. Best short term remedy is t
Electronics Forum | Fri Nov 12 10:00:42 EST 1999 | Dave F
Edmund, following-on from Wolfy: Back in the old days, anyone who could spell "sodder" considered "bright and shiny connections" GOOD and "dull and grainy connections" BAD. Now, "dull and grainy" connections can be either GOOD or BAD, depending on
Electronics Forum | Tue Apr 10 13:12:41 EDT 2001 | davef
You've told us nothing about your situation, process, boards, or anything!!! If you leave some boards with very fine solder connections on the shelf for a cuppla years, the grain will become coarse. What do you mean when you say "grainy"? What is
Electronics Forum | Wed Aug 05 17:52:37 EDT 1998 | Jose Moreno
Dulling the solder joints helps making a better inspection on the joints. I would like to know if somebody has had experience using soldering materials in order to accomplish this task. Your recommendations are welcomed.
Electronics Forum | Sun Jan 18 10:13:59 EST 2004 | davef
Materials added to solder can change its appearance. For instance: * Gold in tin/lead solder is dull / grainy * Palladium in tin/lead solder is dull / grainy We do NOT advocate using visual appearance to define the appearance of a good and a bad so
Electronics Forum | Tue Feb 02 09:51:38 EST 1999 | Justin Medernach
| Hello Everybody: | | I am in urgent need of some information regarding the reflow profile for a flip chip wafer. Would the reflow conditions along with the flux used affect the appearence of the solder joints. | | We are witnessing dull solder j
