By now, most heat treaters should have had some time to read the new revision of AMS2750. The changes are extensive and, since it is considered a complete rewrite, there are no change bars to indicate specific changes.
AMS2750F and Nadcap requirements (both checklists and the pyrometry reference guide) amount to 70% of all Nadcap Heat Treat Audit findings. This trend has been consistent for over a decade now. This can be attributed to a lack of comprehension of the specification, internal execution and inadequate internal auditing systems at the supplier level as well as the prime level. Conrad Kacsik is committed to improving the comprehension of AMS2750F within the industry. We believe that this is the first step in creating a successful Pyrometry Compliance System for our customers.
In the new revision of AMS2750F, standard error limit requirements have been removed from Table 1. The error of ±4°F or ±0.75% is no longer permitted.
AMS2750F has added specific items that must be present on thermocouple certifications. These include, but are not limited to:
AMS2750F now addresses the assembly of the hot junction portion of thermocouples. It states that hot junctions may be made by twisting and/or welding or a combination of those, although no addition of filler metal may be used.
AMS2750F now presents a different definition of expendable versus nonexpendable thermocouples. As a thermocouple supplier, we feel it is important to keep our clients informed as to the details of these changes.
Our goal is to keep our clients up to date on the new changes to AMS2750. In today’s blog post, I’m discussing how AMS2750F now permits Type M and Type C thermocouples. It is important to understand the use and limitations of thermocouples prior to use.
When AMS2750 went from revision D to revision E, one of the changes was that ASTM E29 was required for rounding significant digits. Rounding using ASTM E29 is not your old spreadsheet version of rounding—more discretion is required.
AMS2750F has arrived. With the industry having a limited amount of time to implement
the changes in full, Conrad Kacsik is working hard to keep our customers informed. Our
customers have depended on Conrad Kacsik to be their technical guide throughout the many changes AMS2750 has gone through and we are proud to be doing it again.
If you work in thermal processing in any way, it’s likely that you’ve heard of the National Aerospace and Defense Contractors Accreditation Program (Nadcap). After more than 20 years in aerospace as a metallurgical engineer, much of which in consulting, I’ve heard a lot of opinions about the Nadcap certification process. It’s a rigorous process, so it’s not surprising that it can cause frustration, but I strongly believe meeting Nadcap requirements are the gold standard in process control for many good reasons.
