Electronics Forum | Fri Feb 23 09:55:02 EST 2024 | carl_p
Got you. 225C for peak does seem low to me. Henkle is the main one i've used with a peak of 245c & Alpha around the same although I try to keep that at no higher than 235C as we use it for LED arrays. If the peak is that low, is the liquidus te
Electronics Forum | Fri Feb 23 11:50:14 EST 2024 | emanuel
Unfortunately it is not possible to post pictures here. It looks the same as in these photos: https://yic-assm.com/wp-content/uploads/2019/06/dewetting-1.jpg https://res.cloudinary.com/engineering-com/image/upload/v1577777622/tips/20191216_174750_1_a
Electronics Forum | Fri Feb 23 14:50:14 EST 2024 | carl_p
That link doesn't work for me. From the more you explain - it does sound like an issue I've had in the past on a few different builds. In the end we traced it to a fault with the paste (they were having mixing issues in the chemistry) but they as y
Electronics Forum | Wed Jul 27 09:58:05 EDT 2011 | davef
Pressure printing systems Conventional stencil printing techniques have fundamental limitations as regards paste handling: The volume of paste available for printing is limited, so frequent replenishment is necessary Paste is difficult to c
Electronics Forum | Fri Feb 23 10:10:32 EST 2024 | emanuel
Well, the story is a little more complicated. The product is also an LED lamp made on an aluminum PCB with the LEDs on one side and the drivers on the other. The board itself is not big, about 90x90mm and most of the components are soldering well. Us
Electronics Forum | Tue Jan 16 18:18:46 EST 2007 | greg york
Sorry that answer never really gave you the reason and ways to resolve. Reason - most composite pallets are only good up to 180C so thermal excursions at 250 or even 270c lead free kill them. Try to stay on top of cleaning as well and some pallet mat
Electronics Forum | Wed Aug 16 05:20:29 EDT 2000 | Wolfgang Busko
Richard, take a given volume and weigh it. For your parts you have already determined the aperture opening and stencil thickness and that gives you the volume for each lead of the component. This way you should be able to determine the amount of pas
Electronics Forum | Mon Jan 06 17:37:54 EST 2014 | hegemon
Make sure you are providing an adequate moisture bake out prior to wave soldering. It sounds moisture related since is so random. I would suggest perhaps 120C for a minimum of 8 hours to drive the moisture out, and then complete your wave soldering
Electronics Forum | Thu May 10 19:19:41 EDT 2007 | rgduval
Wayne, I haven't seen anything indicating that Gold Immersion is necessary for lead free... However, it is my companies preferred finish for lead free assemblies. We've taken this stance for the following reasons: 1. Better solder quality on th
Electronics Forum | Thu Jul 28 09:47:06 EDT 2005 | fctassembly
Hello Carl, The main reason there is little information on lead free soldering to ENIG is because most of the lead free soldering to date has been Japanese consumer products. To keep costs down, the major surface coating used has been OSP copper. It
