Electronics Forum | Tue Mar 10 22:27:14 EST 1998 | DWR
What does the term "poor wetting" mean as a defect code ?
Electronics Forum | Wed Mar 11 10:58:58 EST 1998 | Earl Moon
| | What does the term "poor wetting" mean as a defect code ? "Poor" should mean unacceptable when surface (component or PCB solder termination areas) wetting does not provide acceptable solder joints. Unacceptable wetting of PCB solder termination
Electronics Forum | Mon Nov 12 01:18:29 EST 2007 | sin4d
Hi, ALL I experience some QFP with wetting issue on the heel of the lead. There is no fillet wetting on the heel which causes reject bt the customer, but not all the QFP. Could anyone pls help what is the causes of this problem, it is due to oxidati
Electronics Forum | Mon Nov 12 19:47:33 EST 2007 | sin4d
Hi, Thanks. Waitng for your reponse. BTW, if I were to perform a test as below will this give me some result to indicate if the component is defective. 1) Print solder paste on plain PCB without copper track. 2) Mount the QFP & reflow 3) If the sol
Electronics Forum | Mon Nov 12 10:57:23 EST 2007 | chineechooze
i will supply dah 3d chart to sol the problem foryou
Electronics Forum | Tue Dec 18 18:36:58 EST 2001 | guicho_v
Is the Sn% of the plating of the pin related to wetting quality?. I am having issues with one IC maker where some pins are OK and one or two pins are not soldered, even when there is weeting evidence underneath the pin. I am blaming the %Sn too hig
Electronics Forum | Tue Nov 13 22:20:50 EST 2007 | davef
We'd add poor thermal recipe development, focusing on some QPF but not others that may a have a peculiar plating that requires extended time above liquidus.
Electronics Forum | Tue Dec 18 20:41:35 EST 2001 | davef
Look here: http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=4735&#Message18380& As an aside, please start a new thread when you have a new question, rather than resurrecting old [closed] threads like this one from 19
Electronics Forum | Mon Nov 12 09:22:41 EST 2007 | russ
Could be any one of the 3 you mentioned, need some details here, do you really think we can answer this question as it is? Now for your issue, what is the make up of the lead itself on the part? what is the reflow profile at this part? what is
Electronics Forum | Mon Apr 26 17:12:14 EDT 2004 | babe
Take a solder iron with some wire solder and attempt to tin the leads of the component. Look under magnifier or microscope. Did they wet? If not try fluxing them with liquid flux and then soldering again. Did they wet? If they did not then you may wa
