Tensile as per ASME section 9
Tensile as per ASME section 9
(OP)
For procedure qualification per ASME Section 9 and regarding the tensile acceptance criteria, why the code accepts 5% below the the minimum specified tensile strength of the base metal if the sample brakes out of the weld. Contrarely it tolerates not less than the minimum specified tensile strength if it breaks in the weld ?





RE: Tensile as per ASME section 9
(d) if the specimen breaks in the base metal outside of
the weld or weld interface, the test shall be accepted as
meeting the requirements, provided the strength is not more
than 5% below the minimum specified tensile strength of
the base metal.
This applies to either overmatched strength weld metal in relation to either of the base materials being joined or variability associated with the specified mechanical properties of the base material.
RE: Tensile as per ASME section 9
RE: Tensile as per ASME section 9
Reason being that you are testing the weld, not the base metal. If the base metal breaks before the weld, the weld is 'better' than the base metal, and the Welding Procedure was successful.
RE: Tensile as per ASME section 9
May be this is the reason which is related to actual facts