Root Undercuts final welds in (Girth, miter grove & branch connections)

[Shridev Kurup]

Dear Experts,

Requesting your understanding on ASME B 31.3 Table for Radiography interpretation.Table 341.3.2 Acceptance Criteria for Welds and Examination Methods for Evaluating Weld Imperfections

Normal and Category M Fluid
Service- Acceptance criteria H Depth of undercut ≤ 1 mm (1⁄32 in.) and ≤ T w /4

Severe Cyclic Conditions  -Acceptance criteria-A Extent of imperfection Zero (no evident imperfection) 

Category D Fluid Service-Acceptance criteria-I Depth of undercut ≤ 1.5 mm (1⁄16 in.) and ≤ [T w/4 or 1 mm (1⁄32 in.)]

1.What will be your final sentence where you will be observing root undercuts in final welds RT films in each service class separately?

2.For severe service no evident of imperfection required as per code.

3.In Normal & D &M Service where above table is allowing some depth in the welds.Is that is applicable to root undercuts also.How can you prove the depth where in site piping root weld visual is impossible and not practical also.

Under cut is external defect and as per BSEN / ISO 5817;2007 no detail about root undercut.

Maximum depth acceptable is 1 mm in D quality and 0.5 mm in C & B quality.

My understanding for the above table is root undercuts are not acceptable in final weld and RT film & reports. Depth criteria will be applicable when root side access is there like plate welds.


Please reply.

Regards
Shridev

[Jean Staton]

I was under the impression that one can’t judge depth by radiography.

 

Jean Staton

Corporate RSO

Quality, Safety, Environmental Manager

 

METCO - Materials Evaluation & Technology Corporation

27 Sawyer St, Beaumont, TX 77702

Phone: (409) 835-2600

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Email: jean....@metco-ndt.com

Website:  www.metco-ndt.com

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[Nandesh Kumar]

Undercuts can be assessed for it's depth, length and sharpness, visually. If one come across undercuts on a radiograph, only the length shall be assessed (should not be assessed for its depth by measuring the density, what many people think). The numerical criteria given in the table of 31.3, depth and length is applicable only when visual inspection is done. Those undercuts which can not be evaluated during the visual inspection due to joint geometry or some genuine reason like access to the weld  etc then RT acceptance citeria will be applicable i.e. only the length. Please see below ASME 31.3 interpretations, as found on a popular forum: Interpretation: 2•8 831.3 Interpretations No. 2 Subject: Date Issued: File: Table 327.4.IA May II, 1983 1663 (B31 83-016) Question (2): Does the Code describe evaluation of undercutting, revealed on a radiograph, by use of the film density differential? Reply (2): No. Interpretation: 6-04 Subject: Date Issued: File: ANSI/ASME B31.3-1984 Edition With Addenda Through ANSI/ASME B31.3c-1986, Tables 341.3.2A and B; Acceptance Criteria December 14, 1987 B31-87-023 Question (3): In accordance with ANSI/ASME B31.3, Table 341.3.2B, weld undercutting imperfections can be evaluated by visual examination. Table 341.3.2A indicates undercutting imperfections to be evaluated by visual or radiographic examination. In this case, are the radiographic examination acceptance criteria stated for use as a supplementary examination? Reply (3): No. *Note: Consideration will be given to clarify Tables 341.3.2A and 341.3.2B.65 ASME has not done anything till now for what they have mentioned in the above note*. ವಂದನೆಗಳೊಂದಿಗೆ / Best regards, Nandesh Kumar A Abu Dhabi, UAE P.S. : Please don't print this e-mail unless you really need to. --- On Wed, 12/12/12, Shridev Kurup <shrid...@gmail.com> wrote:

From: Shridev Kurup <shrid...@gmail.com> Subject: [MW:16199] Root Undercuts final welds in (Girth, miter grove & branch connections)