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May 2014

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From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Fri, 2 May 2014 18:01:45 +0000
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It depends...Nitrogen will provide you with additional capability, just in case you needed: (ultra fine pitch, aged board, close to end of shelf life solder paste,  - change of customer demand, resulting excessive components inventory, etc. etc. ).  You can reflow at lower peak temperature, if you have temperature sensitive item - big advantage on the leadfree platform.  You can solder better or control profile to suit for mixed platform devices, such as big Ta Cap next to a 01005 if you needed or micro connectors.  

If your designer is super smart and stay within a platform of devices, layout the board perfect with good balance Cu, your JIT is perfect and nothing used are more than 50% of shelf life, your floor life control is perfect and your RH in the work place never go out of wack, (no water/solution dripping stencil either)... sure, air is good enough, provide you do have traps for RH).  

Joyce Koo
Senior MIL Specialist
Materials Interconnect Lab
Office: +1 (519) 888-7465 x 79945
BlackBerry: +1 (226) 220-4760





-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jim West
Sent: Friday, May 02, 2014 1:50 PM
To: [log in to unmask]
Subject: [TN] Use of Nitrogen (reflow ovens)

Good Friday all,

Wondering how many out there, using both lead and lead-free solder, are using nitrogen with your reflow process?  At a previous factory, we did not use nitrogen as part of our reflow process and where I'm working today, we use Nitrogen on all our lines.  I had success without nitrogen and we are having success with nitrogen.  At the APEX show, I spoke with at least one reflow oven manufacture about their oven and what they feel about the use of nitrogen and they pretty much said they are selling less ovens with nitrogen.  To the point of 90%+ of their ovens are sold without the nitrogen option.  As most know, nitrogen is very expensive and I would like to justify not using nitrogen in the future, but I have an uphill climb due to my parent company suggesting we use nitrogen based on a policy created over 7 years ago.  Based on our product mix, I'm of the opinion we don't need nitrogen.

What are your thoughts on using nitrogen with the reflow process?

Has anyone gone through the process of eliminating the use of nitrogen and had success afterwards?

Thanks,
Jim


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