Electronics Forum | Thu Jun 29 10:53:30 EDT 2023 | matouschekd
Repairing these PCBs was not an option due to the delivery amount. Oxidation is unlikely, as these anomalies were visible right after unpacking them and the humidity card was not suspicious. We have since decided not to use these PCBs as the risks w
Electronics Forum | Thu Aug 19 19:04:55 EDT 1999 | Brian Wycoff
| | Can anyone help on the subject of de-wetting during the spray coating process. We use PC29M Parts A+B spray coating material, Humiseal tapes and masking dots, Marigold supertouch V70N gloves and Concoat CM533 liquid masking material. We also use
Electronics Forum | Tue Apr 27 05:10:34 EDT 1999 | Earl Moon
| Which is the preferred method for soldering a bga, adding solder paste or not? Solderpaste manufacturers say to add solder while the rework station manufacturer's say it's not necessary. | Paste is preferred by not necessary. Our studies, conduct
Electronics Forum | Sat May 27 02:52:20 EDT 2006 | TimS
Gentlemen I have managed to pull myself together after banging my head. I am not sure the flux volume is the total solution here. All spray processes deposit flux in a similar manner, that is to say the vast majority of material sprayed onto the PCB
Electronics Forum | Sat Aug 29 08:43:35 EDT 1998 | Dave F
| Hi, Friends, | Could you please recommend me some solder mask materials and equitements for high quality solder mask? Details such as company name, phone numer et al are welcomed. Thanks! | Have a good day | Xingsheng Xingsheng: Consider the follo
Electronics Forum | Tue Nov 07 02:50:41 EST 2000 | CharTrain
A solder wetting balance will indicate a time of less than one second for wetting to occur to a solderable surface. The additional time is required to get the metalized surfaces up to soldering temperature. A single sided board has very little mass a
Electronics Forum | Mon Jun 05 14:10:54 EDT 2000 | C.K.
Dave: Thanks for you Earl-Moonesqe explanations. To answer your 3 questions below: * If there�s no flux in the via, why does the sodder flow? I thought it was the flux that removed corrosion to increase wetting that allowed
Electronics Forum | Tue Jun 06 20:10:28 EDT 2000 | Dave F
You bet. It goes liquidous and tries to flow down hill flux or not. * And wudda wanna bet there�s still flux residues in those vias, anyhoo? Yes, you're right!! There might be excess flux residues in them via barrels....but why
Electronics Forum | Tue Apr 11 20:31:54 EDT 2000 | Dave F
Russ: You�re correct. I should have explained our reasons for preferring concave over convex better. First, we use both also ... we just prefer concave because they: * Don�t bridge any where near as easily. * Self-center better. * Seem to have mor
Electronics Forum | Thu Mar 08 12:40:54 EST 2001 | Ralph Merk
We are currently using 0402 resistors and capacitors in our production process. Our equipment is as follows: - DEK 265 - Siemens S25/F5 - Vitronics XPM520(5 zones) - 2% silver solder Alpha WS678 The problem is that randomly some 0402 capacitors are
