According to ASME B31.3, which has a very strict requirement, Tack Welders are the same as Welders. B31.3 requires that ALL welding (temporary or permanent) on a groove joint be performed by a 'qualified' welder.
You will find flexibility in the fact that ASME B31.3 does not specify HOW they will be qualified.
One possible scenario: If an Examiner witnesses the root tacks being performed, and then RT the completed weld (Welded by a qualified welder); some say that this is enough to qualify the Tack Welder in the positions witnessed, if the tacks are visually acceptable and the RT passes examination to ASME section IX criteria.
Fillet Welders are not qualified to weld on a groove joint (See ASME BPV Code Section IX, para. 303.2).
It is important to ensure that anyone who is welding on the pressure envelope, temporary or permanent, undergoes a documented evaluation and verification of their ability to deposit sound weld metal which is acceptable to Owner and Jurisdiction.
Some other Governing Bodies (AWS, CSA for example) have different ways of qualifying Tack Welders. An expert in our discussion group can speak to this?
Regards,
Darcy Morin
Bantrel Management Services
morind@bantrel.com
o - 780 979 6225
c - 780 782 5692
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of samshuddin k
Sent: December 15, 2011 7:52 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13216] Tack welder qualification
Dear Sir
Thanks for your guidance.
Still I am not clear with the concept
ASME Sec IX says all welding shall be done by a qualified welder, So for tacking groove joint, welder need to be qualified for groove joint.....?
Or if he qualified for fillet joint, he can allowed for tacking groove joint (Tack either incorporated into the final weld or removed).....?
please reply
Samshuddin.K
Asst Engineer-QSA
N-KOM
On 12/13/11, Morin, Darcy (Bantrel Management Services) <MorinD@bantrelmanagementservices.com> wrote:
> ASME IX recognizes "Welders and Welding Operators". There is no
> provision for "Tack Welders" in ASME IX. However, ASME B31.3
> 328.5.1(c) mentions "Tack Welders", and here is the subsequent Interpretation of this clause:
>
>
>
> Interpretation 22-35
>
> Subject: ASME B31.3-2008, Para. 328.5.1(c), Tack Welding Welder
> Performance Qualifications Date Issued: October 5, 2009
> File: 09-1003
> Question (1): Does ASME B31.3, para. 328.5.1(c) require that tack
> welds, whether they are to be incorporated into the final weld or be
> removed, be made by a qualified welder?
> Reply (1): Yes.
> Question (2): Does ASME B31.3, para. 328.5.1(c) require that tack
> welds be made to a qualified WPS for that joint?
> Reply (2): Yes; see para. 328.5.1(a).
> Question (3): Does ASME B31.3, para. 328.5.1(c) allow tack welds on a
> groove weld joint to be made by a welder qualified on a fillet weld
> test?
> Reply (3): No. See ASME BPV Code Section IX, para. 303.2.
>
>
> Regards,
>
> Darcy Morin
>
> Bantrel Management Services
> morind@bantrel.com
> o - 780 979 6225
> c - 780 782 5692
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of samshuddin k
> Sent: December 13, 2011 9:49 AM
> To: materials-welding
> Subject: [MW:13203] Tack welder qualification
>
> Dear Experts
> There is any clause in ASME Sec. IX for tack welder qualification.
> Which Code explains tack welder qualification for piping regards
> Samshuddin.K
>
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