Electronics Forum | Thu May 18 09:15:35 EDT 2006 | Mike Dunn
What is your bath made out of?
Electronics Forum | Thu May 18 09:53:54 EDT 2006 | russ
Are you talking a tin purge here?
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 | Wed Aug 03 21:29:59 EDT 2005 | Ken
Yes, lead can promote fillet lift. In order to understand this defect you must begin looking at your lead frame mateials. some lead frames are more susceptable to this disorder. This is most likely a cte mismatch disorder. Lead contamination in
Electronics Forum | Thu May 18 14:50:08 EDT 2006 | grantp
Hi, The bath is titanium coated, and the machine is only 2 years old, and was designed for lead free, so we know we don't need to change anything. The reason the supplier gave for suggesting the bath change is "other companies are doing it" and it'
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 | Thu May 18 20:01:12 EDT 2006 | grantp
Hi, One other thing, and it's weird to be replying to myself, but what's the melting point of tin? Will the wave do that ok? I guess so, if you guys have done it, but just wondering about it. Regards, Grant
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.
Electronics Forum | Thu May 18 21:05:58 EDT 2006 | Wizard of Oz Tin Man
"Solder alloy compositions are numerous but the most important are still the tin lead solders which were used by the Romans. Tin melts at around 232�C and lead at about 327�C in the combination 62Sn 38Pb the resulting alloy melts at 183�C. This compo
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.
