QAR: Click Here
Conditions for approval required by: Julien Gauther
Certification of Aerospace Products to international quality Standards
Certification of Aerospace Products to international quality Standards
Form restricted to registered, logged in users. Please return to the home page and use the Create Account option.
Conditions raised, please see pdf file “Questions and answers for Arconics qual” attached.
Conditions met after ARCONIC’s reply on the same pdf file “Questions and answers for Arconics qual”.
Pdf file “Questions and answers for Arconics qual” sent on Thursday December 19th 2019.
Condition 1:
As per EN3327, tolerance for shank diameter is f7.
So, for diam. 8, f7 tolerance = -0,013 / -0,028.
Values highlighted in red are good, but I don’t understand “D: -0,036/-0,071”.
ARCONIC’s answer: Shank tolerance diameter – yes, the f7 tolerance band has been incorrectly recorded in the description column for the results table, but the requirements column has it correct at 7,972 – 7,987 and our results align with this. It just needs the description changed to state the correct tolerances as -0,013 and -0,028.
Condition 2: There is a mistake in EN standard to my mind. Since it is a bolt, tolerance is 4h6h and not 4H6H.
Note c states to see figure 1 for thread major diameter. On figure 1, see note “g”.
So, for me, minimum major thread diameter = 7,82 mm (as defined by ISO5855-1, table 3).
Maximum major diameter = 8,000 – 0,025 = 7,975 mm.
ARCONIC’s answer: Thread major tolerance – I partly disagree with the corrected tolerances, but I don’t think what we originally stated is completely correct either.
Agree drawing has an error and should say 4h6h not 4H6H
Agree with the 6h minimum size of 7,82.
Disagree that the maximum size is 7,975.
Drawing notes states 0,025 below ACTUAL shank diameter.
“Safe” option is to record the upper limit in the description and requirements columns as 0,025 below the minimum permitted shank diameter of 7,972, so use 7,947 for upper major diameter limit and it will always be correct.
Alternative is to state “0,025 below measured shank dia” and relate to the earlier results.
Our results are correct by either approach.
Condition 3: This Laboratory Test Report has been established for Acceptance in my opinion.
ARCONIC’s answer: the lab report was raised to cover acceptance and qualification, I did not want two different reports for the same batch.
Condition 4 on IncoTest Report #426411 v2 for tensile test at elevated temperature and stress rupture on bolts:
If I am not mistaken, these tests were carried out on bolts. –
ARCONIC’s answer: yes all tests were on bolts
• In IncoTest Report #426411 v2, EN2002-5 was applied for stress rupture and ISO6892-2 was applied for tensile test at elevated temperature.
ARCONIC’s answer: no sub-contract test house could test to ISO7961, this was the nearest we could get, parameters of ISO7961 used for testing.
• The issue is that these tests were done on bolts, not on specimens (test pieces).
ARCONIC’s answer: – see above
• Standard mentioned in sections 6.2 and 6.3 (ISO7961) is not mentioned in IncoTest Report #426411 v2. Standards test methods mentioned in IncoTest are those for tests on specimens (EN2002-5 for stress rupture on specimens and ISO6892-2 for tensile test at elevated temperature on specimens).
ARCONIC’s answer: see above
• A last thing, neither IncoTest Report #426411 v2 indicates temperature applied for tensile test at elevated temperature, nor section 6.2. It could be good to add that the test temperature is 650°C for tensile test at elevated temperature.
ARCONIC’s answer: Incotest certificate gives the test temperature at the bottom of page 1