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 everyoneSir you are write.For GTAW can not weld due to essential variables deletion of fas.RegardsAnand guptaIocl baroda
On Sun, 25 Feb 2018 at 8:38 AM, Amit Singh<kshtriya.amit@gmail.com> wrote: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 onlyRegards,Amit SinghOn 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.On Sat, Feb 24, 2018 at 6:23 PM, sankar rao<sankarkorukonda@gmail.com> wrote:--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--
On Sat, Feb 24, 2018 at 3:33 PM, PK M<pkmqaqc@gmail.com> wrote: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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