Electronics Forum | Fri Mar 27 14:12:10 EDT 2009 | rgduval
Check with your paste manufacturer for a recommended baseling. The paste manufacturers generally have a database by oven that gives optimal performance for their paste. It's only a baseline, and does need to be adjusted based on the thermal foot pr
Electronics Forum | Fri Mar 27 10:04:51 EDT 2009 | ericthered
We have been having problems with proper wetting when running mainly lead free but also leaded solder in our Ersa Hotflow 3. Solder either often looks grainy or doesn't flow over the whole pad. This is generally the case when my profile is 170 firs
Electronics Forum | Wed Feb 12 14:38:18 EST 2020 | SMTA-Alex
There are several areas you can check. Your profile is very fast. You reach the peak at around 3 minute mark. That's not enough time for the fillet to form. Try to slow down your belt speed to around 90-95, to give it more time. Also, your temperatur
Electronics Forum | Tue Feb 18 20:04:38 EST 2020 | SMTA-Alex
Sebas, some things in your profile don't make sense. 3 of your thermocouples, #1 # 4 and #6 are consistent. The others show completely different data. The consistent thermocouples, also, show peak temp at 241 - 243 degrees. That is extermely high for
Electronics Forum | Tue Feb 11 15:17:49 EST 2020 | emeto
Your profile should be close to this.
Electronics Forum | Tue Feb 11 09:26:57 EST 2020 | astarotf
Hi everyone I have problems welding QFN components in a 10-zone reflux oven, we cannot make a welding fillet that covers the entire QFN pin. Currently we use paste T4 - 63Sn / 37Pb. I enclose the curve of the oven profile. Any help or support on this
Electronics Forum | Tue Feb 11 10:31:20 EST 2020 | emeto
Values and range definitions on your profile attachment are for LF paste not for Tin Lead. Please recheck and redefine, so we get the correct values. Also, which location is the QFN?
Electronics Forum | Tue Feb 11 10:41:30 EST 2020 | dunks
We had this problem at my old job. My understanding (from googling this problem previously) is that the exposed leads on the side of the qfn are not tinned and are not required/designed to have a fillet. Someone correct me if I'm spouting lies.
Electronics Forum | Tue Feb 11 10:59:31 EST 2020 | dontfeedphils
I was going to say, technically it's BTC, so I don't believe it needs a fillet, only evidence of wetting.
Electronics Forum | Tue Feb 11 11:42:06 EST 2020 | slthomas
Yep....I just looked at a copy of IPC-610-G and am not 100% sure but I think it's Note 5, Table 8-16, pg. 8-96.
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