Electronics Forum: micro-crack (Page 1 of 5)

Micro crack for lead free wave solder

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

Cracks on ceramic capacitors.

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 ?

Cracked SMT Capacitors

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

Cracked SMT Capacitors

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

Vapour phase soldering - problem

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

Issues depaneling

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

Cracks on ceramic capacitors.

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

Micro crack for lead free wave solder

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.

Micro crack for lead free wave solder

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.

Micro crack for lead free wave solder

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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