Electronics Forum | Tue Jul 09 00:11:42 EDT 2002 | yngwie
Thanx Dave F.
Electronics Forum | Mon Jul 08 11:53:40 EDT 2002 | yngwie
Hi Guys, We prints solder paste on via hole as the holes are used as the test points. This is a clean process. In normal production, upon completion of a primary side, board will proceed to secondary process immediately. The problem happened when
Electronics Forum | Mon Jul 08 14:41:17 EDT 2002 | davef
See what happens when you take a couple of days off? Your theory sounds reasonable, but someone else could make an equally valid case that you are blasting your solder plug across the room with the force of the expansion of entapped air between th
Electronics Forum | Fri Feb 29 08:12:56 EST 2008 | davef
Solder paste suppliers often make recommendations on solder paste handling after removing it from the container [eg, jar, cartridge, etc]. For instance, Multicore Solder Paste Handling Guidelines, September 2004 says: As a general rule, paste that h
Electronics Forum | Thu Feb 28 14:04:39 EST 2008 | tonyamenson
What happens as solder paste is used when it becomes un-usable? Does it dry out due to flux evaporation or does it absorb to much moisture from the air which changes its composition too much? Now for the big question. I had an operator add flux to t
Electronics Forum | Thu Feb 28 14:32:13 EST 2008 | cyber_wolf
Let me re-state the last part.... The throwing out part is paste dependent.
Electronics Forum | Tue Aug 24 21:52:06 EDT 2004 | rose
recently I met one very interesting issue with my board and connector. substrate of the board is copper with immersion silver, pad size is about 3x1mm. we print lead-free paste on the pad, then put the connector on the paste. The board was reflowed u
Electronics Forum | Wed Aug 25 20:48:17 EDT 2004 | rose
Hello recently I met one very interesting issue with my board and connector. substrate of the board is copper with immersion silver, pad size is about 3x1mm. we print lead-free paste on the pad, then put the connector on the paste. The board was refl
Electronics Forum | Thu Feb 28 14:27:07 EST 2008 | cyber_wolf
The flux dries out and the paste sticks in the stencil apertures. As the flux dries it also causes the solder to oxidize. Hahaha ! I remember adding flux to paste back in the day to loosen it up. Do not do it ! I have been told by reputable industry
Electronics Forum | Fri Feb 29 07:32:43 EST 2008 | samitokgoz
We have the same problem... We are using water soluable solder paste (Alpha ws609) and it dries out very quick. I don't want to throw out the paste inside the printer, but on the other and I don't want to risk my production by adding flux or alchol o
