Electronics Forum | Thu Oct 05 11:40:49 EDT 2006 | Mario Scalzo, SMT CPE
David, We have seeing this more and more in the recent weeks. In a nut shell, yes; we believe that the voids that you are seeing are from the trapped air in the via from printing over it. If you could remove the Kapton tape, this might help. Also
Electronics Forum | Thu Oct 05 15:41:36 EDT 2006 | Mario Scalzo, SMT CPE
Good afternoon. From what it sounds like is that the solder joins are not getting hot enough or if it Au, then the increase in the Au content of the joint is increasing the melting point of the final solder joint. To some extent, this will also hap
Electronics Forum | Sun Nov 05 23:01:53 EST 2006 | Sxsxcx
ok, sorry ,750 was deg F and which I said 350~400 were deg C, I got a mistake. As I know, we use 660~720 deg F to do reworking for lead free solders such as SAC series and SnCu0.7 series solder to protect irons and components on boards. when temp.
Electronics Forum | Fri Nov 03 12:06:07 EST 2006 | mika
Interesting. We are also facing this problem due to; once in a while a matrix tray is mishandled by the operators and as a result those very, very expensive components falls to the floor and the columns got bent. We manage somethime to "straighten th
Electronics Forum | Wed Dec 20 12:49:06 EST 2006 | paul_bmc
I am looking for white papers or information on what happens to 63/37 solder paste alloys when overheated. I have had some solder joint analysis done regarding missing finish on some of the joints. The analysis came back showing a low lead content
Electronics Forum | Mon Jan 15 03:42:08 EST 2007 | adamp
Hi all, Last week I have noticed, that solder changed colour in our Soltec wave soldering machine. I am using normal 62Sn37Pb alloy and it's colour changed to violet/darkblue with gold areas. I know that gold colour means that, there is to much Cu i
Electronics Forum | Wed Apr 18 16:41:43 EDT 2007 | patrickbruneel
Look at page 8 paragraph 22 This exempt was approved by the TAC June 22, 2006 http://www.emsnow.com/cnt/files/white%20papers/Status_of_EU_RoHS_Exemptions.pdf The exempt was granted by request from both Swatch and Sony for tin whisker formation on
Electronics Forum | Thu May 31 12:21:14 EDT 2007 | patrickbruneel
Let me give you some good advice You take already plenty of risk going lead-free, DO NOT use halogen containing fluxes in a lead-free no-clean process. Halogens left on the board will convert tin, silver and exposed copper into metal salts over tim
Electronics Forum | Tue Jun 26 20:51:44 EDT 2007 | davef
You're correct. In the metal working industry, it's common to discuss swarf. For instance: Swarf is a mixture of small metal particles, cooling fluids, lubricants, and residuals from grinding media such as abrasive belts or stone wheels. Swarf is ty
Electronics Forum | Tue Jul 31 22:06:12 EDT 2007 | davef
We had no problems reflowing an assembly on Bergquist Thermal Clad. The assembly was small. So, we built it on a 8-up fixture. It stayed in the fixture from screen print, through pick and place, and into reflow. When the fixture came out of the r
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