Electronics Forum | Thu Apr 19 02:49:07 EDT 2007 | ray
I observed some black dot or some oxidation occured on chip termination on pcba reflowed fews weeks ago as buffer stock. The solder joint and fillet wetting is good and shinning. It is an acceptable or defect condition per IPC standard/requirement? W
Electronics Forum | Thu Apr 19 19:57:09 EDT 2007 | davef
heat and cycle* Here's one of the threads you'll find: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=48102
Electronics Forum | Fri Apr 20 07:40:28 EDT 2007 | realchunks
Hi PeteB Do you know PeteC? Anyway, it all depends on your most sensitive part. Look up the spec sheets to determine. Most general parts can take 3 or 4 heat cycles easily.
Electronics Forum | Mon Apr 23 03:15:13 EDT 2007 | Esah
Yes, we also never experience erosion phenomenon on our solder pot. We are currently using one Sn Cu based alloy, which is SCS7.
Electronics Forum | Tue Apr 24 17:39:05 EDT 2007 | Cmiller
I would not really say green, but muddy, yes. It does not look like tin/lead dross. You should not see it on you solder joints though.
Electronics Forum | Mon May 07 08:07:51 EDT 2007 | realchunks
Hi Jerry, I bet you have dross build up on your wave. Are you running nitrogen? If not this could be the case. Hope this helps!
Electronics Forum | Mon May 07 10:10:18 EDT 2007 | davef
How much flux are you putting on the board when using your foam fluxer? How does this compare to your flux supplier recommendation?
Electronics Forum | Mon May 07 11:25:21 EDT 2007 | colormaker
Flux foam is not affected by board or pallot. This wave is not the same as the hollis I used. The hollis wave flowed from middle to left and right side. This wave only flows to the left and its a very slow wave. Jerry
Electronics Forum | Mon May 07 11:59:48 EDT 2007 | realchunks
Just as I thought earlier, you have a stagnant wave. You should be able to mechanically adjust it so it flows in the same direction of your boards.
Electronics Forum | Fri May 11 14:53:23 EDT 2007 | patrickbruneel
Hi Jerry, Today is Friday and I assume you fired up your machine. Did you achieve any improvements? Always good know if our suggestions helped. Y�all have a great weekend, Patrick
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