Acceptance criteria for Tungsten Inclusion in RT

[prem nautiyal]

Dear Friends   After reviewing a RT film of a Circ.seam joint (16mm thk), which has been welded with TIG + SMAW, i have observed a tungsten inclusion @2-3mm in dia. The construction code of the vessel is ASME Sec VIII Div.1   No doubt this tungsten inclusion is a defect, but i would like to know whether there is any acceptance criteria related to diameter for the same in ASME Sec VIII Div.1. Please give Code reference.   Regards   Prem Nautiyal Cell: 9769316004

[John Henning]

It is considered a rounded indication and is addressed in Mandatory Appendix 4, Rounded Indications Charts Acceptance Standard for Radiographically Determined Rounded Indications in Welds.

 

Paragraph 4.2 Terminology

(a)  Rounded Indications  . . . The indication may be from any imperfection in the weld, such as porosity, slag, or tungsten.”

 

John A. Henning

Welding & Materials

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[Fred Bosman]

Dear Prem

Depending on whether you have applied full or spot radiography, interpretation has to be carried out as per UW-51 or UW-52 of the ASME VIII div 1.

This means that only elongated inclusions of 6mm and larger needs to be repaired for the applied material thickness of 16mm.

Therefore this indication is acceptable.

Technically spoken, a tungsten inclusion is a round defect, which cannot cause cracks in the weld.

Regards

Fred Bosman
tel 055-3604488
mobiel 06-83632297

Op 9-8-2012 17:54, prem nautiyal schreef:

Met vriendelijke groeten

 

Fred Bosman

tel 055-3604488

mobiel 06-83632297

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[joydev dalai]

Dear Prem,

 

There is nothing cleared about tungsten inclusion, for better information please see in ASME sec.VIII Div.1 ,UW-51 paragraph 

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[Jatin Dave]

Dear Prem,

IN ASME B 31.3 Table No. 341.3.2 criteria are  given

F    Slag inclusion, tungsten inclusion, or elongated indication
                                             Individual length ≤ T w /3
                                             Individual width ≤ 2.5 mm (3⁄32 in.) and ≤ T w /3
                                             Cumulative length ≤ T w in any 12T w weld length
G           Slag inclusion, tungsten inclusion, or elongated indication
                                              Individual length ≤ 2T w
                                               Individual width ≤ 3 mm (1⁄8 in.) and ≤ T w /2
                                                Cumulative length ≤ 4T w in any 150 mm (6 in.) weld length

Please see Table 

Regards

Jatin Dave

9099026886

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From: joydev dalai <joykol...@gmail.com>
To: material...@googlegroups.com
Sent: Friday, 10 August 2012 10:51 AM
Subject: Re: [MW:15053] Acceptance criteria for Tungsten Inclusion in RT

[Jean Staton]

Curious, first code reference was ASME VIII, DIV. 1 why did you reference ASME B 31.3?  I am unable to see any reference in ASME VIII that tells me to reference B31.3.  WHY would we go to a piping code when we are on a vessel code in the first place?

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[prem nautiyal]

I found the acceptance criteria for tungsten inclusion which is a rounded indication in Mandatory appendix 4 of ASME Sec. VIII Div.1. I think Jatin didn't read my question properly as i had clearly mentioned that Construction code was Sec VIII Div.1   Regards   Prem Nautiyal   --- On Mon, 8/13/12, Jean Staton <Jean....@metco-ndt.com> wrote:

[Biplab Pal]

Dear Prem,

I think you just follow this.

1) 1st you measure your TI as Relevant or Non-Relevant indication. If
Non-Relevant then accept. If relevant (Sec VIII Div-1, Appendix
4-3)then follow the following:
2) Is is rounded or elongated/linear(Appendix 4-2). If rounded treat
as per Table 4-1. If Linear or Elongated you should UW-51.
I think i have explained.

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Thanks & Regards
Biplab Pal
Mechanical Inspector (PMT)
YASREF Project

E-mail: bipla...@gmail.com

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[Sandeep]

Dear jean,

can you advice the acceptance of TI for piping as per ASME B31.3.

[Sarvesh Mahto]

Isolate - 1/3t

 

Random - 1/4t

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