Electronics Forum | Wed Apr 21 19:32:13 EDT 2021 | davef
Here's some information about Fred Dimock's work on vacuum reflow - Operation of a Vacuum Reflow Oven with Void Reduction Data [ https://smtnet.com/library/index.cfm?fuseaction=view_article&article_id=3336&company_id=40492 ]
Electronics Forum | Tue Aug 17 09:43:59 EDT 2021 | lay1014
Application of vacuum technology VACUUM FURNACE Metallurgical industry: The vacuum technology used in the metallurgical industry includes molten steel vacuum processing, vacuum melting, vacuum induction melting, induction shell melting, vacuum arc re
Electronics Forum | Mon Apr 11 06:37:59 EDT 2005 | amstech
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 irr
Electronics Forum | Wed Aug 14 13:54:54 EDT 2002 | DenM
Larry, You can try one of two approaches, a bake above 100C will drive off moisture or use a vacuum bake. The vacuum bake process is slow since there is less/no air to conduct the heat. In the hybrid industry the standard vacuum bake was 16 hours at
Electronics Forum | Mon Aug 12 19:35:42 EDT 2002 | sleech
Been there, ... done that,...got the T-shirt. When with a major IC manufacturer, we tried this. IT DIDN'T WORK! The problem was that most convection ovens leak. We could not achieve a significant N2 atmosphere.Eventually went to vacuum-assisted bak
Electronics Forum | Wed Aug 14 16:30:55 EDT 2002 | sleech
Dan: Until I got deep into development of a vacuum assisted moisture removal process, I always thought that the bake process would be saddled by the lack of atmosphere in the chamber. I later learned that the conduction of temperature at reduced atm
Electronics Forum | Thu Aug 05 12:16:15 EDT 2021 | cyber_wolf
Exposure Controls: 8.9 HF Engineering Controls: Use only with production equipment (such as stencil printers and re-flow furnaces) with adequate exhaust ventilation and other safety features specifically designed for use with solder paste. Contro
Electronics Forum | Thu Jan 08 16:43:43 EST 2004 | Dean
Unless your machine (internal) thermocouples are each calibrated and compensated no two machines will deliver eactly the same results. Here are your challenges: 1. Data acquisition equipment A-D converter errors 2. PCB measurement thermocouple (t
Electronics Forum | Thu Apr 15 20:41:22 EDT 2004 | Ken
There are ledgitimate reasons for checking furnace calibrations, but let me clarify what that is. 1. TC's are not necessarily calibrted. Not unless you need "absolute" accuracy. TC's operate against a (non-linear) standard +/- a tolerance. Most
Electronics Forum | Fri Dec 03 16:00:48 EST 2010 | glenseely
When faced with high mass, high cost, sensitive PCBs and now with the added challenges of Pb-Free Vapor Phase is the only safe reflow method for component and joint integrity. A-Tek is the National Distributor for Asscon Vapor phase reflow. Asscon
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