WQT-Visual Acceptance Criteria Issue

[limesh M]

Dear All,

 

Design Code - ASME B31.3

Welding Code - ASME BPV SEC IX

 

I want to qualify some welders and welding operators based on ASME BPV SEC IX.

What is the visual acceptance criteria as per code (Suppose there is no client specification regarding this matter)?

Please mention the relevant code clauses for reference.

 

 

 

 

Regards,

 

 

Limesh

[Bathula Raghuram (Mumbai - PIPING)]

QW302.4, QW194

“Performance test coupons shall show complete joint penetration with complete fusion of weld metal and base metal”.

[Karthik]

Hi, Follow B31.3 - Table 341.3.2   Thanks & regards,   (karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Wed, 10/27/10, limesh M <lime...@gmail.com> wrote:

From: limesh M <lime...@gmail.com> Subject: [MW:7847] WQT-Visual Acceptance Criteria Issue

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[limesh M]

Dear Raghuram Sir & Karthik sir,

 

Thank you very much for the prompt reply.Based on this only I can ask remaining thing in my mind.

 

 

Dear All,

 

I reviewed following clauses of ASME BPV SEC IX.

 

QW-142 Special Examinations for Welders

Radiographic or ultrasonic examination per QW-191may be substituted for mechanical testing of QW-141 for

groove-weld performance qualification as permitted in QW-304 to prove the ability of welders to make sound

welds.

 

QW-143 Examination for Welding Operators

Radiographic or ultrasonic examination per QW-191 may be substituted for mechanical testing of QW-141 for groove weld performance qualification as permitted in QW-305 to prove the ability of welding operators to make sound welds.

 

QW-144 Visual Examination

Visual examination as described in QW-194 is used to determine that the final weld surfaces meet specified quality

standards.

QW-194 Visual Examination — Performance

Performance test coupons shall show complete joint penetration with complete fusion of weld metal and base metal.

 

QW-302.2 Volumetric NDE.

 

When the welder or welding operator is qualified by volumetric NDE, as permitted in QW-304 for welders and QW-305 for welding (10) operators, the minimum length of coupon(s) to be examined shall be 6 in. (150 mm) and shall include the entire weld circumference for pipe(s), except that for small diameter pipe, multiple coupons may be required, but the number need not exceed four consecutively made test coupons. The examination technique and acceptance criteria shall be in accordance with QW-191.

 

QW-191 Volumetric NDE

QW-191.1 Radiographic Examination

QW-191.1.1 Method.

The radiographic examination in QW-142 for welders and in QW-143 for welding operators shall meet the requirements of Article 2, Section V,except as follows:

(a) a written radiographic examination procedure is not required. Demonstration of density and image quality

requirements on production or technique radiographs shall be considered satisfactory evidence of compliance with

Article 2 of Section V

(b) final acceptance of radiographs shall be based on the ability to see the prescribed image and the specified

hole of a hole-type image quality indicator (IQI) or the designated wire of a wire-type IQI. The acceptance standards

of QW-191.1.2 shall be met.

 

 

QW-191.1.2.3 Production Welds. The acceptance criteria for welders or welding operators who qualify on

production welds by radiography as permitted in QW-304.1 or QW-305.1 shall be per QW-191.1.2.2.

 

 

 

 

My query is that, QW 194 is dealing with complete joint penetration and fusion only. What is the acceptance criteria for cap and root under cut,arc strikes,bead profile?Why ASME  BPV is silent on remaining defects ? 

 

 

Regards,

 

 

Limesh

 

 

[Karthik]

Hi, You are correct.But Sec.IX acceptance criteria is a minimum requirement.However as per QW301.2 specifies that if manufacturer or his superviso feels that the welder/operator can not produce satisfactory results (apart from sec.IX...i.e undercut,porosity etc.,) he may reject his qualification.Pls.find below the extraction.   QW301.2 (last pragraph) The performance test may be terminated at any stage of the testing procedure, whenever it becomes apparent to the supervisor conducting the tests that the welder or welding operator does not have the required skill to produce satisfactory results. So it is a manufacturer's responsibilty to qualify a welder/operator's qualifications to meet the code specification and acceptance criteria as well as to the company's quality system.   I hope it is clear to you.   Thanks & regards,   (Karthik)

Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Wed, 10/27/10, limesh M <lime...@gmail.com> wrote:

[Engineer Mech]

Dear Limesh,

If u r doing by ASME B31.3, then u have to refer B31.3 acceptance criteria. Chapter 6.

Thanks & Regards
M

[rob...@westernp.com]

Sec IX is not BPV Code, it is reference book for qualification
requirements.

Refer to VT in chapt 6 of B31.3 process piping code.

On Oct 26, 9:33 pm, limesh M <limes...@gmail.com> wrote:
> *Dear All,*
> **
> *Design Code - ASME B31.3*
> *Welding Code - ASME BPV SEC IX*
> **
> *I want to qualify some welders and welding operators based on ASME BPV SEC
> IX.*
> *What is the visual acceptance criteria as per code (Suppose there is no
> client specification regarding this matter)?*
> *Please mention the relevant code clauses for reference.*
> **
> **
> **
> **
> *Regards,*
> **
> **
> *Limesh*

[limesh M]

Dear Mr. Robert,

 

Thank you for the valuable inputs. I reviewed ASME B31.3 Chapter 5 & 6 and observed the following things

 

328.2 Welding Qualifications

328.2.1 Qualification Requirements

(a)

Qualification of thewelding procedures to be used and of the performance of welders and welding operators shall conform to the requirements of the BPV         Code,Section IX except as modified herein.

 

341.4.2 Examination — Category D Fluid Service.

Piping and piping elements for CategoryDFluid Serviceas designated in the engineering design shall be visually examined in accordance with para. 344.2 to the extent necessary to satisfy the examiner that components, materials, and workmanship conform to the requirements of this Code and the engineering design. Acceptance criteria are as stated in para. 341.3.2 and in Table 341.3.2, for Category D fluid service, unless otherwise specified.

 

 

 

Criterion Value Notes for Table 341.3.2

 

C                 Depth of lack of fusion and incomplete penetration                     ≤ 0.2T w

                          Cumulative length of lack of fusion and incomplete                         ≤ 38 mm (1.5 in.) in any 150 mm (6 in.) weld length

                          penetration [Note (7)]

 

 

                           Note (7) Tightly butted unfused root faces are unacceptable.

 

Mr. Robert, Suppose my company’s scope of work comes under category ‘D’ fluid service. As per B31.3 Table 341.3.2, lack of fusion and penetration is acceptable up to some extend for girth and miter groove!!! But ASME SEC IX says complete fusion and penetration required during WQT (irrespective of fluid service).  Can I qualify my welders with ASME B31.3 visual acceptance criteria for category 'D' fluid service?

 

 

 

Regards,

 

 

Limesh

 

 

[Karthik]

Hi, No.For welder Qualification you should satisfy all ASME Sec.IX requirements. Thanks & Regards, (karthik)

Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282

--- On Thu, 10/28/10, limesh M <lime...@gmail.com> wrote:

From: limesh M <lime...@gmail.com> Subject: Re: [MW:7895] Re: WQT-Visual Acceptance Criteria Issue To: material...@googlegroups.com