Electronics Forum | Fri Dec 01 11:36:53 EST 2006 | Rob
These are usually 260C for 5 seconds, however, this is only the top end of the graph. Ask your supplier for the recommended profile for this part and check that you are inside the curve for the whole process. We are going through around 250K of the
Electronics Forum | Thu Feb 14 10:52:18 EST 2013 | adrianus
Hello Dave, Many thanks for your quick reply, it certainly helps but do you have more specifics? For instance, like: Flux type, Temeparture curve, perhaps teh specific process has a name? Best regards,
Electronics Forum | Mon Jan 19 23:18:56 EST 2015 | cspasol
Thank you mac. May I know what t/C's your using? Do you have any recommended High temp solder that we can buy? We already use Kapton, but it affects the curved on our profile data.
Electronics Forum | Thu Aug 18 06:06:07 EDT 2016 | technotronix
Here is a PCBA Warpage calculate method after complete SMT/Through hole assembly Warpage calculation method = warping height / length of the curved edge
Electronics Forum | Mon Dec 03 08:57:14 EST 2018 | robl
Sounds like bent rails. Do you have a laser pen you can shine down both sides of both rails to see if there is any curve?
Electronics Forum | Tue Feb 11 13:03:05 EST 2020 | astarotf
Evtimov The areas analyzed are a standard oven curve according to the pasta we are using. The channels used are only for measuring the oven temperature profile, not in detail of the QFN component sector.
Electronics Forum | Tue Feb 11 17:05:53 EST 2020 | astarotf
Evtimov thank you very much for sharing this profile, we will perform tests with this curve to see behaviors in the oven and pasta.
Electronics Forum | Wed Feb 19 12:30:19 EST 2020 | emeto
Sebas, Curve you attached is using different temp table. We need valid data to evaluate.
Electronics Forum | Tue Apr 27 19:13:04 EDT 2021 | astarotf
Solder balls, can be excess paste by opening ST. Do you see the curve still working pasty with lead with alloy "63Sn / 37Pb alloy" has defects?
Electronics Forum | Wed Oct 26 14:28:12 EDT 2022 | emeto
Hello colleagues, I have a very long flex assembly that I run on a SMT carrier by bending assembly in the middle. This crates a curve after reflow, which I want to get rid if. Any ideas.
