Data collection is a critical component of the heat treatment process, ensuring that all parameters meet stringent quality standards. The topic of data collection in heat treatment often sparks significant discussion, particularly when it comes to complying with Nadcap and AMS2750 requirements. This article explores the best practices for data collection, emphasizing the importance of understanding and adhering to specific guidelines.
In the new revision of AMS2750F, selection of correction factors is now defined. When performing a SAT or TUS at a temperature which does not correspond to a tested value on the thermocouple calibration report, AMS2750F permits the selection of a correction nearest the temperature in use or linear interpolation.
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 now states that third party pyrometry service providers must have a quality system that is ISO/IEC 17025 accredited from an ILAC (International Laboratory Accreditation Corporation) recognized regional cooperation body by June 2022. This accreditation will apply to the laboratory standards and/or field service as applicable.
