Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


reflow oven

greg

#33629

reflow oven | 10 April, 2005

Hi there

I have a question about reflow oven for Pb-free technology. I've noticed that some of the manufactures offer reflow ovens with short (26-30 lenght in cm) heat zones others offer longer more then 30 cm. So there are ovens with total heat lenght the same but with diffrent number of zones (5 or 6 or 7). What is better - shorter lenght of the zones but more number or longer lenght of the zones? What are the resons of the diffrent lenght of the zones and theirs numbers?

Greg

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ams

#33635

reflow oven | 11 April, 2005

As long as you have a continuous profile with required soak and dwell periods, the zone lengths do not matter. For lead free, usually ramp to peak is preffered.that is with minimum soak (you can not avoid soak anyway. You can achieve the profiles irrespective of the furnace zones. Furnaces with more zones are more stable and are with better pocess control. If your budget is not a constraint, go for them.

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#33636

reflow oven | 11 April, 2005

Make sure you find out that short to longer ovens are both Lead-Free capable. If you want respond here on what they say for future reference for people.

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greg

#33639

reflow oven | 11 April, 2005

One more question.

Is it realy worth to have reflow oven with nitrogen for lead free?. What are yours experiences?

Greg

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#33640

reflow oven | 11 April, 2005

You should buy an oven that actually melts the solder on your boards.

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Rob

#33650

reflow oven | 12 April, 2005

.....and not the components

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ams

#33654

reflow oven | 12 April, 2005

Nitrogen flow helps good joints. But proves to b expensive. Choice will be yours.

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