Pyrometry procedures that comply with AMS2750E and/or Nadcap requirements can be complex and challenging to meet. I often perform gap analyses on heat-treat processes and uncover issues with procedures and work instructions that, if not remedied, will ensure failure when it comes to meeting Nadcap or AMS2750E requirements.
Procedures must contain all required items and should ideally flow in a logical, easy-to-understand format. Correctly documenting necessary instructions requires an understanding of AMS2750E and Nadcap checklist requirements. If your procedures are haphazardly altered with new statements from findings or a major revision to specifications, the document will be hard to follow for your staff, rendering it ineffective and making compliance with the AMS2750E standard and Nadcap requirements unlikely.
After decades of helping clients meet AMS2750E and Nadcap pyrometry requirements, I’ve built a deep understanding of the requirements and the common mistakes suppliers make.
Know the Requirements
Suppliers often focus on the technical requirements of AMS2750E procedures or Nadcap certification. While these are vital, documenting how you conform to those technical requirements is just as important. Fully comprehending the statements within the AMS2750E specification or Nadcap requirements takes a professional-level understanding of pyrometry. Applying the correct requirements to your operations also requires knowledge about different types of furnaces. This demands training in both the technical terms used as well as the actual testing itself.
After achieving a solid baseline understanding of AMS2750E requirements and Nadcap regulations, you may be able to draft a pyrometry procedure that will conform to the AMS2750E standard and Nadcap and apply to your operations.
Writing the Procedure
For pyrometry, following the flow of AMS2750E is often helpful when comparing the specification and the procedure. The example below shows this method, which shows the many similarities between Nadcap’s Pyrometry checklist AC7102/8 and AMS2750E. AMS2750E and Nadcap’s AC7102/8 are not identical in their layout and flow, but they are close enough in the major categories to ensure readers of both can make quick comparisons.
Simplify Where You Can
After performing dozens of gap analyses and internal audits during my decades as a Nadcap and AMS2750E expert, I often see suppliers that separate work instructions or procedures for each category. For example, they’ll use a single document to account for thermocouple requirements and the same scenario for system accuracy testing and temperature uniformity surveys. This means a change in requirements for system accuracy sensors would require two procedure modifications—one for the sensor procedure and another for the system accuracy testing procedure—which increases the opportunity for error.
Placing all pyrometry requirements within a single work instruction or procedure helps to ensure that any changes can be accounted for in all of the pyrometry requirements.
Focus on Your Application
If a specific topic within the AMS2750E standard or Nadcap checklist requirements doesn't apply to your operations, it may be wise to omit the topic altogether. For example, if your heat-treat operation consists of vacuum furnace brazing only, and each furnace is a Type B instrumentation type, skip Types A, C, or D for your procedure. It would also be logical to omit retort furnace requirements since it involves a vacuum furnace. Being overly broad can lead to issues, such as auditors suspecting a lack of training or lack of detail on the part of the supplier. These red flags can lead the auditor to examine items more closely, ultimately leading to more findings. At the same time, it’s important to understand when not to omit requirements within AMS2750E and the Nadcap checklists even when they do not apply to you. As an example, if you do not allow offsets to be placed into your equipment, you should state in your procedure that offsets are not permitted. Simply leaving this out would be cause for a Nadcap finding as it leaves your staff free to use offsets as they please.
Each supplier seeking to conform to the AMS2750E standard or Nadcap checklist requirements has his or her own unique combination of processes, materials, furnaces and prime requirements, so tailoring your documentation to your needs is important.
If you need advice on your documentation, consulting, procedures or training to meet Nadcap or AMS2750E requirements, contact Conrad Kacsik.