ASME Sec 1 & IX

[GemmellG]

Setting up welder testing (Orbital P1 to P1 2.5" x 0.203") Root pass is showing smooth internal concavity (IC) ASME Sec IX does not reference (IC) is it relevant in evaluating the test coupon. Construction code to be used is ASME Sec 1 which allows (IC) as-per (PW-41.2.2). NDE is Phased Array we have been working with he NDE Contractor to come up with an acceptance criteria before the work starts. NDE Tech is stating (IC) should be as-per ASME Sec 1 (PW-52.3.3 (Other). Please adavise.

 

[bpv66]

GemmellG,

How do you justify using UT to test this coupon?

QW-191.2.1 of ASME Section IX only permits use of UT to test coupons on material 1/4" and greater. According to your post the tube is less than 1/4". Unless I am missing something, this coupon should be bend tested or radiographed in order to meet ASME Section IX testing requirements.

Regarding the acceptance criteria, I think Section I can be used to address the internal concavity.

 

[GemmellG]

Not using PAUT for welder testing (Bend Test). PAUT is being used for construction.

 

[weldstan]

If coupon meets ASME IX visual acceptance and passes root and face bend requirements, it is acceptable. Concave root surface is not that uncommon with automatic orbital GTAW welding systems. Section I requires full fusion and that has been demonstrated. The production welds are not subject to RT or UT under PW-11.

 

[metengr]

This may be an owner's requirement which goes above and beyond the Code minimum. With that said, the NDT technician is correct in using the concavity requirement in Section I for circumferential butt welds, if required by the owner.