Electronics Forum | Mon Aug 01 06:59:02 EDT 2005 | Joseph
Dear all, We observed visible micro crack at top side of solder fillet during lead free wave solder process. We did not see any visible micro crack at bottom side, and it always located at joints of transformer. Any input be much appreciated. Best
Electronics Forum | Tue Jul 01 07:08:33 EDT 2003 | iman
suggest you check the preheat conditioning in the wavesolder process is sufficient, as this is the main culprit for micro-crack CAPs ?
Electronics Forum | Wed Jun 13 17:50:06 EDT 2001 | deonn
Igmar, Have had similar problems in the past caused by different factors. The first obvious area to check is in your pick and place machine. Too much force in the Z-Direction may cause micro-cracks, which are not apparent, until the board is proces
Electronics Forum | Wed Jun 13 17:50:28 EDT 2001 | deonn
Igmar, Have had similar problems in the past caused by different factors. The first obvious area to check is in your pick and place machine. Too much force in the Z-Direction may cause micro-cracks, which are not apparent, until the board is proces
Electronics Forum | Wed Aug 26 03:21:00 EDT 2009 | sergey2007
Hi Graham, the MSD level of the component is 3. I am not sure that my customer properly stored the component before the soldering process. And I am not sure that it was dried at all. The customer says they did everything that they had to, but I just
Electronics Forum | Mon Nov 23 19:20:18 EST 1998 | Kevin
A buddy of mine has problems after depaneling double sided pre-scored PCB's. Resistors near the edge, after put into the slice and dice machine contain micro cracks. He's checked for them before and after depaneling. We figure it is the sectioning
Electronics Forum | Fri Jun 20 10:27:19 EDT 2003 | Cristiano Dick Smiderle
Hi We are experiencing serious problem with ceramic capacitors. They are with low electrical resistence and the problem is intermittent. We found some of them with micro cracks but not all. What could be the causes for this problem? We are su
Electronics Forum | Mon Aug 01 08:38:57 EDT 2005 | kamrant
Joseph, What is the topside temp reading of your board before reaching the pot? Do you have top-heater in your wave machine? It sounds like; you got an insufficient per-heating issue.
Electronics Forum | Mon Aug 01 09:06:33 EDT 2005 | davef
Based on your description, it sounds like the solder connection is defective. Further description of board and solder materials and assembly processes would be helpful in moving forward.
Electronics Forum | Mon Aug 01 20:02:20 EDT 2005 | Joseph
We use SAC305 and top side particular joint temp. is 110 deg C, and the terminal finish for that particular lead is pure tin. It look like hot tearing at the primary side of PTH.
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