Electronics Forum | Sun Sep 15 09:13:41 EDT 2002 | davef
A near eutechtic alloy [ie, 63/37, 62/36/2, etc] would be fine. People print, place, and reflow millions of cermaic capacitors with these alloys every day.
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
Electronics Forum | Tue Jun 28 09:39:00 EDT 2005 | davef
Points to consider are: * Gold plating too thick [SB LT 8 uinches]. [Obviously, we're talking about actual plating thickness, not the specification.] * Reflow recipe improper [SB 220*C 5-10 sec]. A recipe that works fine for HASL needs to be hotter
Electronics Forum | Wed Jun 29 06:57:20 EDT 2005 | mattkehoe
Hi Bob, We tried flowing the pads with a soldering iron. The pad at the tip of the iron went shiny but as soon as the iron was taken away, the pad returned to the dull finish. You could actually move the tip around the pad and it would shine up then
Electronics Forum | Tue Oct 30 18:43:31 EST 2001 | mparker
My first thought is board warp. This is something you can't see when the board is in a reflow oven. I see it occasionally going through wave solder. You may need a pallet with hold down clamps for reflow. Try putting a bare board in a baking oven at
Electronics Forum | Tue Oct 30 14:39:41 EST 2001 | markhoch
Has anybody else out there had problems with SMT connectors with plastic locating pins lifting up during the reflow process? We've had several instances with several differant types of SMT connectors lifting up during the reflow process. We've even g
