Time and temp in lead and lead-free reflow

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I am trying to optimize my reflow profile. i have a 5 zone o... - Jul 25, 2008 by brettc

What paste are using? You should referance the manufactures ... - Jul 25, 2008 by Chip_Flip

I am not very concerned about production time, but it is alw... - Jul 26, 2008 by brettc

Ideal situation is get a technical rep from the solder paste... - Jul 28, 2008 by blnorman

Do you have a Slim-Kic? You can run a profile and then do p... - Jul 28, 2008 by Real Chunks

thanks, looks like an interesting product. any idea of the c... - Jul 28, 2008 by brettc

Take a look at this. Remember, these are only guidlines and... - Jul 28, 2008 by garyr

my oven has a built in profiler, it works fairly well, but i... - Jul 28, 2008 by brettc

Oh, well if you can profile, model your profile to the profi... - Jul 29, 2008 by Real Chunks

Some profiles can be difficult to get exactly, so I was wond... - Jul 29, 2008 by brettc

Slight variations should have little impact on your product ... - Jul 29, 2008 by Real Chunks

You can keep only the 5th zone as the reflow zone. And lower... - Aug 01, 2008 by Leo

Is there a limit to the time that most components can stay a... - Aug 02, 2008 by brettc

If you have concerns, you can look at the datasheet for each... - Aug 04, 2008 by garyr

brettc

#55699

Time and temp in lead and lead-free reflow | 25 July, 2008

I am trying to optimize my reflow profile. i have a 5 zone oven.

lead-free: for the 1st 3 zones, i am good, at about 150-200 deg for 150 seconds.

during the 4th zone, i am at a temp of 200-220 for 50 seconds.

during the 5th zone, i am at 220-245 for 50 seconds.

am i spending too much time between 200-220? will this affect the flux?

___ likewise, for leaded, zone 4 is 160-180 deg for 50 seconds before reflow in zone 5.

am i spending too much time between 160-180? ____

i can slow down alot and ramp up very slowly in the beginning. then try to stay in zone 5 for a long time. but this is bad for time and production. also, i am not sure if it is okay to stay at a lower temp for a long time (zone 1-4 would be pretty long).

or i can speed up and use zone 4 and 5 for reflow, but then my ramp up speed in zone 1 would have to be pretty high.

any thoughts?

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Chip_Flip

#55700

Time and temp in lead and lead-free reflow | 25 July, 2008

What paste are using? You should referance the manufactures time and temperature specification. Running lead-free in a 5 zone oven can be done with out a problem but it is not production friendly. If you are concerned with through put I would look for a 7 to 10 zone oven.

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brettc

#55703

Time and temp in lead and lead-free reflow | 26 July, 2008

I am not very concerned about production time, but it is always a thought! Quality is more importnant of course.

We have 2 different pastes, with almost identical requirements. We can get close to their profiles, but i am worried that i am spending a little too much time in zone 4 (or maybe zone 4 is about 10 deg too hot?) but it is the only way to get zone 5 up to temp.

i am looking for a trade off between best quality and reducing time if possible. if i have to slow down to half the speed, i will. but then i will be spending about 2 minutes just ramping up to 120 deg! not sure if this will pose another problem?

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blnorman

#55717