Electronics Forum | Tue Jun 07 19:24:26 EDT 2005 | Joseph
Dear all, Recently we encountered some functionality failure when using lead-free component(Sn99.3/Cu0.7)at SnPb(Sn63Pb37) wave soldering process. Can lead-free component use at non-lead free process? Any input/idea are much appreciated. Rgds
Electronics Forum | Sat Mar 06 06:15:14 EST 2004 | Bryan
Thanks Tommy. In fact I've tried many types of profile,but it didn't work.I'll try to make the peak temp. as low as 205C and dwell long as in some threads Dave said.I've tried baking the BGA and PCB before mounting also dindn't work.yes,I've heard th
Electronics Forum | Thu Nov 01 03:10:07 EST 2001 | Brian Sloth Bentzen
Will the gold from some Ni/Au surfaces make the solder joints appear dull and a slightly rugged on the surface ? Does anyone have any experience with this ? Thanks !
Electronics Forum | Thu Nov 01 17:40:52 EST 2001 | davef
Listen to Wolfgang. Your dull solder connection is a process indicator. Some 63Sn / Au solder connections look grainy, depending on how your process them and the materials involved. Gold dissolving in tin forms an intermetallic compound [AuSn4] th
Electronics Forum | Wed Jan 01 22:19:33 EST 2020 | sssamw
Solder ball attached on solder joint without violation minimum electrical clearance is acceptable. If your process parameter including stencil not changed, suggest you check if solder pasted being pushed out after IC placement, also check if solder j
Electronics Forum | Wed Mar 28 14:38:24 EDT 2007 | amelara98
solder joints are dull on the bottom, and surprisingly, darkened, "black" on the top, especially at one location only.
Electronics Forum | Tue Sep 06 10:20:33 EDT 2005 | slthomas
I love these stories. At my previous employer we experienced intermittent failures on an audio microprocessor assembly being used on a *new* product. This board had numerous microprocessors and complex firmware aboard. They discovered one PLCC on
Electronics Forum | Wed Mar 28 13:14:38 EDT 2007 | amelara98
I am having problems with a product we receive from our overseas plant, where there is excessive "dullness" of solder joints/metal surfaces after running a board on a pallet through wave solder. Seems to be an issue of the pallet, as the solder appe
Electronics Forum | Wed Mar 28 14:06:46 EDT 2007 | realchunks
Hi A, Your subject is black solder, but you decrribe the solder as dull? Dull solder joints could be dross related, or even flux related. Are there any other related defects? But "dull metal sufaces" makes me thing this board was subjected to so
Electronics Forum | Mon Jul 01 15:37:56 EDT 2002 | pjc
Possible cause can be design related- if the solder land is too small. Check w/ IPC SM-782 Solder Land Design Guide Another is board finish. I have seen problems like this with Gold finished PWBs- which creates a more brittle solder joint.Another pos
