Held between 29-31 January 2020 in Berlin, Germany, the World Money Fair gathered together thousands of coin collecting enthusiasts, metal working businesses, and we were there.

Much more than just a jamboree for hobbyists, the WMF is a major trade event, where deals are done and ideas are shared.
As part of the packed program of guest speakers, we had the chance to explain how vacuum heat treatment works, and how it applies to coin production. And we really made an impression.

In this article, we'll look at the WMF itself, and offer some insights from the TAV VACUUM FURNACES team that should be relevant for anyone in the minting industry.

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AMS 2750F has been reviewed and updated with the revision G at the end of June 2022, the document has the same length. Revision G deleted some tables, now there are only 22. Small changes have been made to better clarify the meaning. Transition requirements from Rev. E to Rev. F (allowed for 2 years) have been eliminated with only one transition exception:

• Transition exception

Digital recording instruments that read only integers may be used for 1 year after the release of AMS 2750 Rev. G and must have a maximum calibration accuracy of ±1 °C or ±0.2% of the temperature reading rounded toward the smallest integer.

This latest transition is extended to 1 year after the release of Rev. G (see 3.2.3.2.1), so applicable from June 29, 2023 (as the last date), then all temperature recorders must be digital and read the decimal degree (°C or °F).

What has changed?

• Rev. G removed all references to analog instruments, only the digital ones are allowed!
• Sensitivity Test has been deleted and no longer required for digital instruments ....... however you should take into account your customers’ requirements.
• For load sensors, required in vacuum furnaces, records must include sensor batch number, load cycle, temperature and usage count  which must include usage during SAT and TUS.
• Table 6 rewritten to remove decimals – It rearranges Celsius version of Rev. E.

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What are the requirements for a radiation survey according to AMS 2750F (Aerospace Material Specifications)?

First of all, it is important to state that such a survey is required under AMS 2750, exclusively for furnaces used for the Thermal Treatment of Aluminium Alloys and it is limited to process temperatures above 427°C.

Therefore, it is mainly for plants dedicated to Thermal Treatment of Solubilisation. The solubilisation temperature for many alloys is very close to the eutectic melting point and this is why in these types of furnaces, it is also necessary to test the radiation effect directly on the metal as well as measuring and certifying the temperature uniformity of the operating volume qualified within the limits required by the applicable specifications.

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I first encountered the Nadca 207 specification in 1999. At that time, a large die weighing 400 kg, hardened by our heat treatment plant, cracked in the die casting foundry, and the tool shop wanted to compensate us for the damage caused. We did not believe that the fault was on our side. But then we learned about the Nadca 207 specification, and because we had good contacts, we invited Mr. Corwyn Berger, one of the co-authors of the specification, to a lecture in the Czech Republic. His presentation "Extended tool life on die casting" permanently changed our views and the way we work in the heat treatment shop.

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