Tensile test - gauge length
Tensile test - gauge length
(OP)
I have a requirement to measure the % elongation of tensile tests when testing a PQR to ASME IX.
However the parralel length shown in the dimensions to ASME IX is weld width plus 1/2" (13mm). This is not long enough for the clip gauge.
The gauge length / parallel length of the specimen makes no difference to the outcome of the UTS, therefore i see no reason to duplcate tests.
However-
Q) If i increase the parallel length, does this invalidate the test to ASME IX.
Q) I am i required to test two more samples with the correct gauge length to ASME IX? (this will entail welding more coupons, arranging third part and client witnesses to re-visit)
Q) How do i go about getting clarification from the comittee, as to whethter or not the size stated is specified or a minimum size (Thus allowing elongation measurement), as it bears no relation to the outcome of the test (to measure the UTS.)
Any help would be appreciated.
I work in a materials test laboratory, and as such i have to meet the specification, regardless of how silly the requirement may be.
However the parralel length shown in the dimensions to ASME IX is weld width plus 1/2" (13mm). This is not long enough for the clip gauge.
The gauge length / parallel length of the specimen makes no difference to the outcome of the UTS, therefore i see no reason to duplcate tests.
However-
Q) If i increase the parallel length, does this invalidate the test to ASME IX.
Q) I am i required to test two more samples with the correct gauge length to ASME IX? (this will entail welding more coupons, arranging third part and client witnesses to re-visit)
Q) How do i go about getting clarification from the comittee, as to whethter or not the size stated is specified or a minimum size (Thus allowing elongation measurement), as it bears no relation to the outcome of the test (to measure the UTS.)
Any help would be appreciated.
I work in a materials test laboratory, and as such i have to meet the specification, regardless of how silly the requirement may be.





RE: Tensile test - gauge length
Also, increasing parallel width does not invalidate measuring percent elongation because the requirement you stated below;
is a minimum requirement, not a maximum value. So, yes, you can increase the size of the specimen to test for percent elongation, if that is what you need. Please re-review ASME Section IX, Welding Data, QW-462.