Very well put
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of John Henning
Sent: Monday, October 12, 2015 10:06 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:23709] Backing Gas for SS Pipe Welding
Depends on the Code and the process.
For Section IX, GTAW: addition or deletion of backing gas or a change in flow rate of the backing gas is a non-essential variable. It must be addressed on the WPS but can be changed without any requalification.
If you are unfamiliar with ASME IX, first column are essential variables (changes require requalification), 2nd column are supplementary essential variables (apply if impact qualification is required), and third column are nonessential – variables that must be addressed on the WPS but can be changed.
So, technically, the WPS meets Sc IX if addressed as none. But, stainless steel should be gas backed or back gouged and welded (except in very specific instances) to prevent oxidation of chromium at the root of the weld.
Hope this helps.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of navnitkumar parikh
Sent: Monday, October 12, 2015 8:23 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:23707] Backing Gas for SS Pipe Welding
Dear
Deletion of backing gas is an essential varible so if PQR qualified with backing gas then mention backing gas in WPS.
Regards,
Navnitkumar Parikh
Asst. Manager-Welding
Thermax Limited
On 12 Oct 2015 18:39, "pras ari" <alhanif.pras@gmail.com> wrote:
Dear Experts,
I have read WPS/PQR and I found that on PQR mentioned use backing gas (argon) with argon but on WPS without backing gas (argon).
Please advise to me, this WPS/PQR approved or not?
Thanks & Regards
Winarko
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