I am not sure if I have seen an article comparing solder joint strength Vs pressfit although I am sure this has been researched by literally hundreds of companies before they felt comfortable going to pressfit. I know one of the issues with solder is cracking under vibration, or due to defective soldering. Properly applied pressfit pins maintain a gastight connection with the PCB and don't have any cracking tendency.
I will do a little more research and let you know what I find. In the mean time, there is some very good history in pressfit connector usage.
My personal experience with pressfit pins goes back to the mid-80's when I worked for Northern Telecom. We were using pressfit pins in telecom applications (backplanes for switching systems) by the many millions per year. As you probably know, the telecommunications industry has always maintained very high reliability standards because the phone system is considered an essential service for safety. At the same time AT&T was using an even larger number of pressfit pins in their competing digital switches.
In the more recent past I have stayed in touch with the major connector manufacturers such as AMP, BERG, Teradyne, Erni, EPT etc.. Together they ship tens of millions of pressfit connectors each year.
You may be familiar with the relatively new industrial PCI bus called Compact PCI. It uses all pressfit connectors. Intel is using pressfit connectors on their high end servers, and most new high end datacom/telecom applications use pressfit connectors.
As you can tell, I am a big proponent of this technology and I think it will grow at a fast pace for years. I will let you know if I find any interesting reports. Meanwhile, feel free to contact me if you would like to discuss this further.
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