1. Welder qualified for GTAW of cs is qualified to do ss welding (see QW-356, QW-433- no essential variable for performance qualification is changed), but the reverse will not be true, unless the cs welding is done with purging. This is not true for SMAW however, where the F-No for cs and ss consumables are different and hence this (change from cs to ss) will constitute a change in essential variable, needing re-qualification.
2. ASME B&PV Section IX does not explicitly call for tack welder qualifications, because that is generally specified in the design and construction code, which has referred to ASME Section IX for qualifications. For example, see para.328.5.1 (c), ASME B31.3, which states explicitly that "Tack welds at the root of the joint shall be made with filler metal equivalent to that used in the root pass. Tack welds shall be made by a qualified welder or welding operator. Tack welds shall be fused with the root pass weld, except that those which have cracked shall be removed. Bridge tacks (above the weld) shall be removed". Code interpretations are interpretations of the code requirements by the code committee and therefore are valid as long as the referred clause still exists in the current version/edition of the code. Sometimes, interpretations lead the code committee to make changes to the code by incorporating revision so that there is no further ambiguity in the interpretation, whereas in other instances it clarifies the intent of code with regards to specific requirements. The referred to interpretation is valid in this instance and implies that you cannot qualify a tack welder to ASME Section IX by just using him to tack weld in a welder performance test welded by another welder. It clarifies the intent that even tack welders need to weld full coupons meeting all requirements of ASME Section IX including all test requirements. AWS D1.1 para.4.2.2.2, 4.2.3.2, 4.19.1.2, 4.19.2.2 and 4.20.2 specify and define tack welder qualifications.
3. No.
Interpretations are not Code.
This is well known
Best regards
Dr Georgios DilintasHBS Regional Technical Manager
Authorized Nuclear Inspector
Authorized Inspector SupervisorFrom: "rajesh s. mhaske ,Engineer Welding ,PUNE,INDIA" [rajesh.mhaske17@gmail.com]
Sent: 08/29/2014 09:04 PM MST
To: materials-welding@googlegroups.com
Subject: Re: [MW:21746] Welder Qualification
Dear sir--
Plz refer Following
QW-301.2 Qualification Tests.
Each manufacturer or contractor shall qualify each welder or welding operator for each welding process to be used in production welding and also refer following Interpretation
Interpretation: IX-77-04
Subject: Section IX, Tack Welder Qualification
Date Issued: January 31, 1977
File: NA
Question: May a welder be qualified as a tack welder if his tack welds were a part of another
welder's qualification test coupon or part of another welding procedure qualification test which
met the intent of the Code?
Reply: The Code requires that all welders, (including tack welders), must be qualified per
Section IX.
On Saturday, August 30, 2014 12:25:36 AM UTC+5:30, George Dilintas wrote:You will not find in the Code the term "tack welder".
The Code is addressing only tack welds. "Tack Welders" are not addressed by the Code.
If tack welds remain in place, then they have to be performed by qualified welders
best regards
Dr. Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS HELLAS
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
(See attached file: Dilintas_George.vcf)Kannayeram Gnanapandithan ---29/08/2014 06:05:44---tack welder qualification is not mandatory as per ASME Sec 9 THANKS & BEST REGARDS
From: Kannayeram Gnanapandithan <kgpan...@gmail.com>
To: materials-welding <material...@googlegroups.com>
Date: 29/08/2014 06:05
Subject: Re: [MW:21739] Welder Qualification
Sent by: material...@googlegroups.com
tack welder qualification is not mandatory as per ASME Sec 9
THANKS & BEST REGARDS
KG.PANDITHAN, AWS-CWI, CSWIP 3.1
CONSULTANT-WELDING & QUALITY
On Mon, Aug 25, 2014 at 8:05 PM, Shridev Kurup <shridevk20@gmail.com> wrote:
Tack.1 ..Removal type no need because that potrion welded by unqualified welder does not going to be included in final weld.Tack 2.Non removable type Qualified welder required as per code.
So it is important you note what type of tacking is ongoing. Like...Bridge tack or something else. Again manufacturer can say they going to remove these unqualified welder welded tacks during the welding.
Regards
ShridevOn 25 Aug 2014 17:12, "Dhanabal Jalachandran" <dhanabal.jalachandrann@gmail.com> wrote:
Dear,
Regarding point 2, as you have said,
The tack welding is going to be removed.? so the welder may or may not be qualified.? Kindly suggest.
Point 2-As per code you need to qualified welder for tack weld also because it depends whether tack become part of welding aur you are going to remove it also material, service conditions of equipment.
BR
Dhanabal Jalachandran
On Mon, Aug 25, 2014 at 12:14 PM, Mohit Aggarwal <aggarwalmohit05@gmail.com> wrote:
Dear,Point 1 If a welder is qualified in CS for GTAW process then he is qualified for SS with gas backing Argon because for GTAW process deletion of gas backing is essential variable if you carefully go through CODE and for GTAW filler wire SS and CS
both falls in F NO 6 AS given in code. So CS qualified welder cam make weld in SS and for P no welder is qualified to weld in P1-P15, P34, P41-P43 etc. As per code.Point 2-As per code you need to qualified welder for tack weld also because it depends whether tack become part of welding aur you are going to remove it also material, service conditions of equipment.
Point the 3-If both codes requiement filled and after client approval welder is qualified.
Best Regards,
Mohit Aggarwal.On 25-Aug-2014 2:10 PM, "Dhanabal Jalachandran" <dhanabal.jalachandrann@gmail.com> wrote:
Gent's,
Kindly need your advice to clear one issue based on Welder Qualification.? These questions were asked to me yesterday in Aramco Interview.
- If a welder is qualified with CS, can he weld SS.? ( i answered he cannot as F4 and F5 doesn't allow as per ASME Sec IX), but the interviewer told me it can be welded in GTAW with some kind of Gas i forgot the name of it. but i have gone through all the reference code i dont find any as P number and F number are essential variable.
- Welder requires tack welding qualification in ASME Sec IX or AWS D 1.1.? As per ASME Sec IX all the welders need to be qualified. As our company manufactures only Tanks and Vessels not much involved with AWS D 1.1, is there any applicable stuff where specifically welder needs to be qualified for Tank welding if he is not qualified welder.??
- If a welder is qualified with ASME Sec IX, can he weld the jobs with the code based on AWS D 1.1.? I have answered yes it's possible as the requirements need to be followed, i.e., Essential variable, Client approval as per AWS D 1.1 Clause 4.2.2.1
Regards
Dhanabal Jalachandran--
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