Dear Mr. Gohil,
Kindly read the references also from QW 353 and QW 356 , like for P no chage please refer from QW353 to QW403.18 and QW423
For your case, I believe that for both carbon steel and alloy steel welding consumable is F No.6 for GTAW, hence if your welder qualify in carbon steel with F No.6 material , he will be qualified for P No.4 also, provided, other essential varialbles of QW 356 doesn't change ( i.e . diameter, backing, position etc)
But for SMAW , carbon steel F No. and alloy steel F No may be different, hence the welder may be not qualified.
You have to consider, all the essential variables of QW 353 and QW 356 and also the correspond references.
Hope it will clearify youe doubts.
Kind Regards,
Sukamal Naskar
On Sat, Mar 19, 2011 at 5:08 PM, Narendra Gohil <ngohil@qafco.com.qa> wrote:
Dear Mr. Naskar,
That means mainly we have to follow QW-353(SMAW) or QW 356(GTAW) for welder qualification.And that clearly mentioning P no as essential variable for the base metals.
So here even if my welder is qualified with CS.I have to go for separate qualification for low alloy steel as P no. is changing.
Kindly correct me if my understanding is not correct.
Thanks & rgds
From: Sukamal Naskar <sukamalbecmet@gmail.com>
To: materials-welding@googlegroups.com
Cc: Narendra Gohil <ngohil@qafco.com.qa>
Date: 19/03/2011 11:52
Subject: Re: [MW:10428] Welder's qualification for diffrent steels and steel alloys.
Sent by: materials-welding@googlegroups.com
Dear Mr. Gohil,
Whenever you will qualify any welder, you have to consider all the essential variables QW353, QW356.
The F-No will chage for SMAW , and for GTAW may be the F-No wil be same.
If all the essential variables of QW 353 (SMAW) and QW 356 (GTAW) dosen't change , then you can qualify the welders accordingly.
Kind Regards,
Sukamal Naskar
Senior Welding Engineer
Bohler Welding
On Sat, Mar 19, 2011 at 11:36 AM, Narendra Gohil <ngohil@qafco.com.qa> wrote:
Dear Experts,
As per ASME sec.IX- QW423.1 mentioning Base metals for welder qualification and also mentioning qualified production base metals against that.
Like; P-or S-No.1through P -or S- No.11,P- or S-No. 34,and P- or S-No.41 through P- S-No.49 and against that same grouping and range of P- or S-No. mentioned for qualified production base metals.
That means if a welder qualified with as for example in CS(P no-1) welding(GTAW or SMAW any one ) with preheating and PWHT welding parameters,he can qualified with Low alloy steel like (P.No.4 or other in low alloy steel).
I have been questioned by our Inspection experts and I don't have answer other than mentioned in QW401.2"essential variable"(Performance).
Thanks & Rgds.
Narendra Gohil
Welding Engineer
QAFCO
Ph.+974-44228289(O)
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