Electronics Forum | Fri Dec 03 19:44:34 EST 1999 | Russ
Hello all, I am in the process of converting our facility to noclean processes. So far I am experiencing troubles with soldering to gold finishes. The finish is an H.P. type1. The solder joints appear dull and grainy. They seem to be very strong
Electronics Forum | Wed Jul 12 11:26:12 EDT 2006 | flipit
Hi, I believe you have classic gold imbrittlement here. With 80 microinches of gold you are way over the limit. You can try to reflow longer time and at a higher temperature. The gold does not melt into the solder joint. The gold dissolves into
Electronics Forum | Tue Jul 11 14:09:54 EDT 2006 | Chunks
Not reflowing completely. Slower = hotter. Try a slower conveyor speed.
Electronics Forum | Tue Jul 11 12:59:26 EDT 2006 | mattkehoe@sipad.com
We are trying to apply solder to boards with 80 microinches of electro plated hard gold. No components involved, just print 63/37 paste and reflow. The results are very poor on some boards, not so bad on others? Pictures at http://www.sipad.net/thick
Electronics Forum | Tue Dec 07 16:34:54 EST 1999 | Russ
Wolfgang, I appreciate your continued feedback! The main reason that I shortened the Time Above Liquidous (TAL) was it appeared that I was burning off all of the flux from the paste. By shortening the TAL to 45 seconds and decreasing peak temp to
Electronics Forum | Tue Jun 28 10:51:32 EDT 2005 | mattkehoe
Thanks for the replies, - solder paste used ? NC ? other ? Water soluble 63/37 paste - reflow in Air or N2 ? Infrared - temp ramp up before soack (�C/second) ? Will have to check. This profile has been used on numerous gold plated boards in our
Electronics Forum | Tue Jun 28 18:40:36 EDT 2005 | Bob Gilbert
Matt, Try putting a soldering iron to a pad to see if you get reflow. If it reflows, your oven is too cool. If no reflow, your oven may be too hot. Regards, Bob
Electronics Forum | Tue Jun 28 10:41:57 EDT 2005 | GS
I am not an expert but just for my understanding: - solder paste used ? NC ? other ? - reflow in Air or N2 ? - temp ramp up before soack (�C/second) ? Tnks GS
Electronics Forum | Wed Jun 29 17:18:41 EDT 2005 | GS*
Very interesting tread, many thanks to all. Matt please, now what does it mean for you? Will your custmer accept dull solder joints or will the plating be changed ? (ie. HASL, ENIG, etc) Tnks and regards GS*
Electronics Forum | Tue Jun 28 07:27:32 EDT 2005 | Matt Kehoe
We are experiencing a situation that we would really appreciate some expert opinions on. Our process prints solder paste then reflows it without components. Normally the paste wicks into a very shiny rounded meniscus. Even over gold, the round pads a
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