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1111 views
05:07 Jul-13-2000
Brian Younce
ASTM E1444 Requirement

NDT Folks,
In reviewing ASTM E1444 (1999), I became hung up on a requirement described in section 5.5 "Examination Sequence". It is recommended that "parts heat treated to an ultimate tensile strength of 180 ksi or higher that are heat treated and subsequently electroplated shall be inspected after the electroplating operation".
My questions are: does this suggest that parts having an ultimate tensile strength of 180 ksi or higher should be inspected twice, once prior to electroplating and once after electroplating? Would one inspection after electroplating be sufficient (plating thickness of less than .001")? What are the types of discontinuities to be concerned with? If the plating process is tightly controled, do you still need the post plating inspection?

Just curious if anyone has had any personal experience in dealing with this requirement, and if so how it was handled.

Thank you,
Brian


 
07:36 Jul-13-2000

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1199
Re: ASTM E1444 Requirement Brian:
ASTM 1444 Para. 5.5 is fairly specific about this.
It requires that WHEN specified, MPI is done after operations that could cause surface or near surface defects.
Then it goes on to state that MPI is to be done prior to coating unless otherwise approved by the contracting agency or as approved by para. 6.1.3. (6.1.3 describes conditions that would limit MPI through coatings).
Not withstanding 6.1.3, 5.5 goes on to state that MPI will ALSO be done on parts heat treated to 180ksi or higher and subsequently electroplated, AFTER electroplating.
This would therefore imply MPI is needed before and after electroplating unless the contracting agency does not require the MPI prior to electroplating (the requirement for MPI after electroplating is a SHALL condition so MUST be done).

Ed

: NDT Folks,
: In reviewing ASTM E1444 (1999), I became hung up on a requirement described in section 5.5 "Examination Sequence". It is recommended that "parts heat treated to an ultimate tensile strength of 180 ksi or higher that are heat treated and subsequently electroplated shall be inspected after the electroplating operation".
: My questions are: does this suggest that parts having an ultimate tensile strength of 180 ksi or higher should be inspected twice, once prior to electroplating and once after electroplating? Would one inspection after electroplating be sufficient (plating thickness of less than .001")? What are the types of discontinuities to be concerned with? If the plating process is tightly controled, do you still need the post plating inspection?

: Just curious if anyone has had any personal experience in dealing with this requirement, and if so how it was handled.

: Thank you,
: Brian




 
02:20 Jul-13-2000
Brian M. Younce
Re: ASTM E1444 Requirement >Thank you for your response. Is it safe to say the reason for the inspection after electroplating is based on a concern of hydrogen embrittlement cracking? If so, what is the nature of hydrogen embrittlement cracking??? Is it always an obvious condition (gross indications) or is it more of a material related condition which often goes undetected but serves as a vehicle for a stress/fatigue related crack in years to come???
>
>Regards,
>Brian

: Brian:
: ASTM 1444 Para. 5.5 is fairly specific about this.
: It requires that WHEN specified, MPI is done after operations that could cause surface or near surface defects.
: Then it goes on to state that MPI is to be done prior to coating unless otherwise approved by the contracting agency or as approved by para. 6.1.3. (6.1.3 describes conditions that would limit MPI through coatings).
: Not withstanding 6.1.3, 5.5 goes on to state that MPI will ALSO be done on parts heat treated to 180ksi or higher and subsequently electroplated, AFTER electroplating.
: This would therefore imply MPI is needed before and after electroplating unless the contracting agency does not require the MPI prior to electroplating (the requirement for MPI after electroplating is a SHALL condition so MUST be done).

: Ed

: : NDT Folks,
: : In reviewing ASTM E1444 (1999), I became hung up on a requirement described in section 5.5 "Examination Sequence". It is recommended that "parts heat treated to an ultimate tensile strength of 180 ksi or higher that are heat treated and subsequently electroplated shall be inspected after the electroplating operation".
: : My questions are: does this suggest that parts having an ultimate tensile strength of 180 ksi or higher should be inspected twice, once prior to electroplating and once after electroplating? Would one inspection after electroplating be sufficient (plating thickness of less than .001")? What are the types of discontinuities to be concerned with? If the plating process is tightly controled, do you still need the post plating inspection?

: : Just curious if anyone has had any personal experience in dealing with this requirement, and if so how it was handled.

: : Thank you,
: : Brian




 


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