ASME IX QW-153.1 Tensile Strength

Date 03-24-2011 15:43

I just got back from the API-653 course where I was introduced to the 5% rule for tensile test.

Where paragraph (d) says “outside of the weld or weld interface” does that mean 1) right at the weld the 5% applies and, 2) the remainder of the base metal must meet minimum requirements?

QW-153.1 Tensile Strength
In order to pass the tension test, the specimen shall have
a tensile strength that is not less than

(a) the minimum specified tensile strength of the base
metal;

(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.

Donnie Mann

By MBSims

Date 03-24-2011 17:23

My interpretation would be that if the failure occurred anywhere in the base metal except at the weld fusion line (interface), the 5% rule would apply. If it breaks at the fusion line or in the weld metal, the 5% rule would not apply.

By 3.2 Inspector (***)

Date 03-25-2011 00:49

MBSims is correct.

3.2