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Re: [MW:27398] If a welder is qualified with SS (Stainless Steel) GTAW, He can weld CS Carbon steel GTAW?

By Materials & Welding

Dear Team


Essential, non-essential or supplementary essential variables exists while we qualify WPS.  Once we prepare WPS mentioning essential and non-essential variables, we cannot change that while production welding.  We have to follow whatever is mentioned in WPS.  If we want to change an essential variable we have to separately qualify the WPS.  If we want to change a non-essential variable, we have to revise the WPS (no separate PQR required) and take approval.

 

Hope you understood. 

Regards,

PETER SOLOMAN

TECHNIP FMC 

DUBAI



On Sun, Feb 25, 2018 at 12:46 PM, PK M <pkmqaqc@gmail.com> wrote:
Dear sir,

Backing gas or Purging Gas is not essential variable for WPS.

Thank you

On Sun, Feb 25, 2018 at 10:39 AM, Peter Soloman <petervsoloman@gmail.com> wrote:

Just check the qualification details.  P8 to P8 qualifies for P1 to P1 also.  F number for carbon steel and stainless steel filler wire are same. But deletion of backing gas(QW 408.8) is an essential variable. Since you are not giving backing gas for CS, the welder cannot weld CS with GTAW even though he is qualified on SS with GTAW.   

And if the contractor wish the welder to weld CS where he is qualified on SS,  They can weld the joint by providing backing gas for CS, provided CS GTAW WPSs shall have backing gas mentioned in it.  But 99% of CS WPS for GTAW will not have backing gas!!!


 

Required welding variables as per Sec IX is below.  Hope this helps


Regards,
PETER SOLOMAN

On Sun, Feb 25, 2018 at 9:44 AM, 'anand gupta' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Good morning everyone 

Sir you are write. 

For GTAW can not weld due to essential variables deletion of fas. 

Regards 
Anand gupta
Iocl  baroda

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On Sun, 25 Feb 2018 at 8:38 AM, Amit Singh
Removal of Gas Backing is essential variable that's why a SS GTAW qualified welder is not qualified for CS GTAW joints, however reverse can be true for GTAW procedure only
Regards, 
Amit Singh

On 24-Feb-2018 18:30, "'Prashant Panchal' via Materials & Welding" <materials-welding@googlegroups.com> wrote:
Please check gas backing is essential variable for welder qualification. 


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On Sat, Feb 24, 2018 at 6:23 PM, sankar rao
If welder qualified with SS 
(GTAW Process),
He can weld CS ( GTAW Process)
Because of F.No's same for both SS &CS  for GTAW 
SS ---- F.NO 6.  SFA NO. 5.9
CS----- F.NO 6.   SFA NO. 5.18

On 24 Feb 2018 14:50, "'Prashant Panchal' via Materials & Welding" <materials-welding@ googlegroups.com> wrote:
Since he may have used backing gas for SS gtaw he will not be qualified for carbon steel as we do not use backing gas for cs material. 
Alternatively u will have to use backing gas for cs as well

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On Sat, Feb 24, 2018 at 3:33 PM, PK M
Dear Sir,

If a welder is qualified with SS (Stainless Steel) GTAW,  He can weld CS Carbon steel GTAW? Need code Referance...

Thanks.
PKM

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