AC7101 Material Testing NADCAP requirements

N

noe vargas

#1
This is my first post and I look forward to working with all of you. I am new to this side of the Aerospace industry. I was in the Marine Corps and did aviation in there but it's a whole new beast out here. In the military, we follow procedures; out here we have to make them!

Now, I am pursuing a NADCAP accreditation in Rockwell hardness testing, chemical analysis (AL, High Alloy Fe, Ni), Elemental analysis (nitrogen) and tensile testing. First off, if you are pursuing these, feel free to ask questions, I will share all the info I can and will send you documents because I am the originator and I would have loved someone help me the way I am willing to help anybody. Now questions:

1. Does anyone have a working sample of AC7101appendix B: Non conforming and no-representative test? This is where you record your results that fail or do not fit the population. Nadcap has examples on the checklist and I used those almost word for word but it doesn't make sense...

2. AC7101/2 Figure 1 chemical analysis capabilities ask for elements, test codes, detection range and precision. WTF is the precision? It is not defined ANYWHERE! Thermo advised that it is the absolute sigma of the initial calibration or curve regression. Could someone please let me know what they did for their precision?

Keywords AC7101 AC7101/1 AC7101/2 AC7101/3 Material testing, Nadcap requirements
 
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Stijloor

Staff member
Super Moderator
#2
This is my first post and I look forward to working with all of you. I am new to this side of the Aerospace industry. I was in the Marine Corps and did aviation in there but it's a whole new beast out here. In the military, we follow procedures; out here we have to make them!

Now, I am pursuing a NADCAP accreditation in Rockwell hardness testing, chemical analysis (AL, High Alloy Fe, Ni), Elemental analysis (nitrogen) and tensile testing. First off, if you are pursuing these, feel free to ask questions, I will share all the info I can and will send you documents because I am the originator and I would have loved someone help me the way I am willing to help anybody. Now questions:

1. Does anyone have a working sample of AC7101appendix B: Non conforming and no-representative test? This is where you record your results that fail or do not fit the population. Nadcap has examples on the checklist and I used those almost word for word but it doesn't make sense...

2. AC7101/2 Figure 1 chemical analysis capabilities ask for elements, test codes, detection range and precision. WTF is the precision? It is not defined ANYWHERE! Thermo advised that it is the absolute sigma of the initial calibration or curve regression. Could someone please let me know what they did for their precision?

Keywords AC7101 AC7101/1 AC7101/2 AC7101/3 Material testing, Nadcap requirements
Can someone help Noe?

Thanks.

Stijloor.
 
B

BadgerMan

#3
I wish I could help but NADCAP is not my "cup of tea".

Let's try moving the thread and get some more/different exposure.
 
N

noe vargas

#4
For those of you who are coming to this post for answers, the precision is the standard deviation from the initial calibration. If you are seeking a NADCAP certification, then when the machine is being calibrated, you need the standard deviation for the high and the low on the element of every base metal. If your calibrators did not do this, you need a standard with that value on it and you have to run it 10 times and record the standard deviation.

For example, the low on my spectrum for aluminum in stainless steel is .001. I found a sample with that value in it and ran the sample 10 times. The standard deviation is the precision. The accuracy is not important, just the standard deviation. Accuracy is not important because the machine will compensate if the value is incorrect with a type standard update.

Contact with any questions or help with the first question I posted.
 
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