For procedure qualification per Section IX:
· Backing is addressed in Non-Essential variable QW-402.5 (addition) for GTAW
· Backing is addressed in Non-essential variable QW-402.4 (deletion) for SMAW
· Back gouging is addressed in Non-essential variable QW-410.6 (method) for both GTAW and SMAW
Your WPS must, per QW-200.1(b), address the non-essential variables. A change to the non-essential variables is permissible without requalification but must be addressed in the current or a new WPS.
See interpretation IX-81-32:
Status: |
| Currently Valid |
Status Description:
Interpretation: | IX-81-32 |
Subject: | Section IX, QW-200.4 |
Date Issued: | May 13, 1982 |
File Number: | BC-81-205 |
Related Documents: |
Question: QW-200.4 states, in part: "One or more processes or procedures may be deleted from a production joint..." In a procedure for a GTAW root and SMAW fill, can the GTAW root be deleted and the production joint welded completely using SMAW?
Reply: The joint can be completely welded with SMAW provided this process has been properly qualified for the deposited weld metal thickness range to be used in the production joint.
The above interpretation was transcribed by HSB Code Services from the official publications
This issue has been interpreted to death, see also interpretations:
IX-04-08
IX-95-10
IX-86-01
IX-92-77
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of rudolf saldanha
Sent: Tuesday, September 17, 2013 1:35 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:18673] Multiple process GTAW+SMAW Process,
hI, Saravanan,
May I know if it is mandatory by code that back gouging has to be done when we have a Full Penetration Joint using only SMAW process.
As far as I know, backing and back gouging are supplementary essentials for SMAW process.
To get a full penetration it is not compulsory to go for GTAW + SMAW process, but we can still do it with SMAW only.
We can use LB52U which also belongs to SFA 5.1 just as E7018, and it is commonly used for welding on pipelines where welding is done on one side.
The above link may be of help.
Please correct me if I am wrong.
Thanks and regards
Rudolf
From: Saravanan Sornam <saravanshyla@gmail.com>
To: materials-welding@googlegroups.com
Sent: Tuesday, 17 September 2013, 14:05
Subject: Re: [MW:18670] Multiple process GTAW+SMAW Process,
Hi San ,
I said that , only SMAW on the Inaccessible Pipe size, for example 6 ", cannot be welded and even you cannot get Full Penetration using E7018 only on Single V Bevel.
It should be welded only by using GTAW for Root and subsequent welds by SMAW until Cap.
Regards,
Saravanan,
Korea
On Mon, Sep 16, 2013 at 7:32 PM, jaffar ali riyas mohamed nizamin <jaffarqc1987@gmail.com> wrote:
dear ssaravanan,
I cant understand what you are saying.. we are also using SMAW for sch 40 for 12" pipe .the root will be ER 70S-2 and fill/cap is E7018...
On Mon, Sep 16, 2013 at 9:03 AM, Saravanan Sornam <saravanshyla@gmail.com> wrote:
Dear San ,
As U said, the WPS is for Piping Welding works,
are you planning to use SMAW only for piping ? Then, what is the Pipe Size for production Joint ? What is the weld metal deposit thk for SMAW ?
E7018 cannot be used for Single V for piping if not access , unless you use SMAW for the plates only, welded on both sides , after back gouging Or Grinding.
Regards,
Saravanan,
Korea
On Mon, Sep 16, 2013 at 1:50 AM, shankar narayan karanth <karanthequipments@gmail.com> wrote:
Dear San,
One is permitted to carry out the welding by only one of the two or
more processes used for the qualifying procedure povided 2T
requirement of the weld metal deposited is valid for each of the
process employed.
P.S.KARANTH.
On 9/14/13, Weld Giant <mksan2000@gmail.com> wrote:
> Hello welding expert,
>
>
> We have approved WPS, GTAW+SMAW ( ER70S2+E7018) Process for piping welding
> works. Shall we use only SMAW process with back chipping as per QW -200.4
> (a) paragraph.1, 2 for the single V groove joint.
>
> san
>
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