Chris,

I think you attached the profiles, but all attachements are stripped on this reflector.

It is all about the mass of the board and the chemistry of the paste. There is no ideal profile. Once you have one you like you may use this as a starting point, but if you showed us a profile, I would venture to say that there are no one on this reflector that could say with certainty that it was the right profile for your board. The proof is in the pudding. 

About  80 % of our boards are leadfree and we have found that the Ramp To Spike curve works best for us. Soaking tends to spend the flux too early. The Ramp must keep the delta temp across the board to a minimum. You must adjust the zones and the belt speed such that the profile is as short as possible while keeping the delta at a minimum. 

That is where your profiling starts. 

Good luck.

-----------------------------------------
Leif Erik Laerum

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Christopher Young
Sent: Tuesday, December 13, 2011 4:17 AM
To: [log in to unmask]
Subject: [TN] Thermal profile for lead free

Hi all,

 

Could you give me some data on ideal temperature against ramp time for lead free profile.

 

We have a 8 zone oven with profiles as follows. Are they both ok from a solder process point.

 

At reflow zone Temp is at 220 c - 240c max for 30secs on one product. 

 

Any help or thoughts on thermal profiling would be great.

 

Regards

 

Chris 


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