NDE and MPI
NDE and MPI
(OP)
Dear All,
Is it necessary to do NDE or MPI for final machining component? Is there any possiblity that material can be cracked or defect after machining?
If any defect/crack is because of raw material or procedure of machining problem?
Thanks
Is it necessary to do NDE or MPI for final machining component? Is there any possiblity that material can be cracked or defect after machining?
If any defect/crack is because of raw material or procedure of machining problem?
Thanks





RE: NDE and MPI
Machining as such will not introduce defects in the raw material,excepting build up of internal stresses ( probably if due care is not taken,).
If you mention the alloy being machined and the machining process,better information can be available.
I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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RE: NDE and MPI
That's mean once we already present the test at the raw material, so we dont need to do test to the machining product.
Thanks
RE: NDE and MPI
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: NDE and MPI
Currently our forging supplier do UT test for the raw forging material(per heat no.) then once finish machining we do MPI test to the finish product.
Do we still need to do MPI for the final machining even we already check the raw material?
Is there any possiblity the material crack due to during machining job?
RE: NDE and MPI
Please also remember that no upgradation will be permitted if the parts leak under pressure test.
I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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RE: NDE and MPI
JR97
RE: NDE and MPI
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: NDE and MPI
Ask me how i know.... :(
RE: NDE and MPI
I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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RE: NDE and MPI
:(
RE: NDE and MPI
thanks for sharing your experience. No words can compensate for your pain and frustration. I have marked your thread and sent them to a few friends of mine.
Who did the NDE? Was it by an independent agency or used vendor's facility?
I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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RE: NDE and MPI
I also just experienced it last 3 weeks, which after machine we found porosity causing 1 heat was rejected.
During UT not found any defect.
RE: NDE and MPI
Is improved NDE the solution, or perhaps better oversight of the forge and ingot manufacturing procedures? I'm not sure what the limits of current UT practice are.
RE: NDE and MPI
RE: NDE and MPI
depending on the type of heat treat and material,
defects from machining can be induced. Normally from grinding. Yes this is the result of wrong grinding wheels or procedure or both.
forgings or castings but also wrought material will crack during heat treat if not properly processed or it can open up defects not detected from previous NDT.
I have experienced UT not detecting fine defects.
you need an example\Test piece for the technicians to qualify their test.
so this is where mag & penetrant is useful.
picks up fine defects on the surface