PWHT and test specimen
PWHT and test specimen
(OP)
for what kind of material and thicknesses we do simulation test specimens for the tensile analysis after heat treatment?
thanks
thanks
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RE: PWHT and test specimen
RE: PWHT and test specimen
I wanted to know if this kind of test is mandatory for the those parts imposed to PWHT?
as we have some columns which licensor mentioned in specification that :
"The affect of heat treatment on tensile strength shall be determined by testing specimens from each heat of plate, pipe, and forgings {small forgings may be tested on
a “lot” basis as defined in ASME Section VIII, Division 1, Section UG-84(e)(2)}The specimens shall
be subjected to the maximum heat treatment.The results
shall comply with the requirements of the subject material specification."
Our Vendor is going to deviate from specification to do this test only for the plates not for the forging parts.
we are going to make a decision if we can deviate from spec or force vendor to do that ,however it's vendor's responsiblity to gaurantee the columns design during life cycle
any advise?
thanks
RE: PWHT and test specimen
I see no reason to relax on forging requirements. Where I come from this certification is a part of material test report and welding procedure qualification. Also, in the case of hardness and/or impact requirements minimum PWHT conditions are tested for each material heat.
To add: does the Vendor guarantee cover also the production losses?
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RE: PWHT and test specimen
So, yes in a round about way thermal treatments that are performed on a material because of PWHT have mechanical tests performed to assure meeting minimum mechanical property requirements.
RE: PWHT and test specimen
a “lot” basis as defined in ASME Section VIII, Division 1, Section UG-84(e)(2)}The specimens shall
be subjected to the maximum heat treatment.The results
shall comply with the requirements of the subject material specification."
I do not understand at all:
It looks to me that everything asked is in the MTR already
for the material specification for the ASME Material.
RE: PWHT and test specimen
When you order the material, order it to include the simulated PWHT during your manufacturing process.