ArticlesFred’s articles & papers
Some of Fred’s papers, magazine articles, and presentations are available on the links page
and in the About US / Knowledge Section of the BTU International web site.
Following are a few of the significant papers – including links to Mike Konrad’s Podcast, new papers,
and those that have been recently updated.
RELIABILITY MATTERS PODCASTS
Following are links to two Reliability Matters podcasts hosted by Mike Konrad from Aqueous Technologies where Fred and Tim O’Neil from AIM discuss void mitigation and profiling
Episode 64 Solder Voiding Mitigation
Episode 65 A conversation with Tim ‘Neill and Fred Dimock about reflow profiling
FLUX, REFLOW OVENS, NASCAR, AND MOONSHINE
The connection between flux and reflow ovens is obvious, but are there ties to stills and race cars too? Fred takes a tongue in cheek look at solder paste flux and the latest flux collection techniques while helping the reader to understand why and how different flux collection techniques work.
OPERATION OF A VACUUM REFLOW OVEN WITH UPDATES
This updated presentation was given at the 2021 SMTA ICEHET conference in Markham, Ontario Canada (it was also presented to the SMTA Space Coast and Capitol chapters) where Fred explained the operation and configuration of an inline vacuum reflow oven. This presentation includes the previously reported voiding data generated when the Pyramax Vacuum reflow oven was at Universal’s Advanced Process lab, additional data from APL – including a discussion of unintended consequences, and the results of rework demonstrations at the American Competitive Institute.
FLUX AND FLUX MANAGEMENT IN A NITROGEN REFLOW OVEN
Fred describes the numerous methods of managing flux in a reflow oven in a paper he presented at the 2021 SMTAI conference.
OVEN ADJUSTMENT EFFECTS ON A SOLDER REFLOW PROFILE
In August 2009, Circuits Assembly magazine published Fred’s article on how various reflow oven adjustments affected the thermal profile. This article quickly became a classic when it received the highest number of download requests that Circuits Assembly ever received in a year and it became the second highest the following year.
MAKING A CASE FOR CONTINUOUS FURNACES
Fred explains why a continuous furnace is ideal for processes that require high production volumes, process consistency, and precision control in an a paper published in the September 2021 issue of Industrial Heating magazine. This overview discusses some of the temperature and atmosphere capabilities of continuous furnaces and addresses the various components that make up a continuous furnace.
WHAT IS THE REAL TEMPERATURE? OR WHAT IS MY TC REALLY TELLING ME?
In 2001, Fred presented a paper on TC accuracy and repeatability in a thick film firing process with peak temperatures of 850 degrees C at the 21st ASM International, Heat Treating conference. Later he encountered an issue with TC accuracy and repeatability while adjusting the trim on a 25 inch wide 850 C high temperature furnace while attempting to obtain cross belt uniformity of +- 1 degrees C that had him look at how the accuracy of TC changed over multiple runs. This study showed that TCs accuracy was quickly lost and he added it to the presentation. Because of strong interest showed by the SMT community he also added data for SMT reflow temperatures. The final cross belt uniformity paper has been presented numerous times in North America and Asia, and the data is used as a part of his ½ day SMTA Fundamentals of Reflow Class. The original and updated cross belt uniformity papers are available here.
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