Strange !! IMPACT Test question
Strange !! IMPACT Test question
(OP)
This is one of those times when I think I already know the anwer but someone has shaken me up.. so I'll ask anyway.
My client required impact test to -50 degC (ie: -58 degF). My fabricator already has procedures tested to -65 degF (ie:-53.9 degC) which we submitted to the client (WPS and PQR). They were rejected for wrong temperature ????
Is there something I'm missing here or is it just my client being silly?

David
My client required impact test to -50 degC (ie: -58 degF). My fabricator already has procedures tested to -65 degF (ie:-53.9 degC) which we submitted to the client (WPS and PQR). They were rejected for wrong temperature ????
Is there something I'm missing here or is it just my client being silly?

David





RE: Strange !! IMPACT Test question
But I don't think he understands the reasons for and methods of impact testing.
Unless you are designing to a very specific temperature or using a very specific material the FTE to NDT is on an approximate 45° slope. This coupled with a normal scatter pattern of impact testing is usually acceptable by all.
The accepted impact values of all materials are averages.
The only reason I could see requesting same would be that your numbers are vert, very close to minimum accepted values he is looking for.
RE: Strange !! IMPACT Test question
RE: Strange !! IMPACT Test question
Yes I think he is nit picking.
We're looking at A 516 Gr60 base (also impact tested) and ENi1K filler; SAW.
Thanks for the ref to UG-84, that's just what I need.
David
RE: Strange !! IMPACT Test question
One other time when there is possibly a reduction in temperatures is when subsize specimens are used because of lower thickness of the PQR. Please check if the specimen on the PQR was still a 10mm x 10mm x 55mm. If not check if the correct correction temperature was applied!!
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
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