Saturday, March 19, 2011

Re: [MW:10436] Welder's qualification for diffrent steels and steel alloys.

Dear Mr.Narendra Gohil,
 
       In the table QW-353 & QW-356 for base metal variable you have to look after QW 403.18 which states as follow,

QW-403.18 A change from one P-Number to any other

P-Number or to a base metal not listed in table QW/QB-

422, except as permitted in QW-423, and in QW-420.2.

Finally regarding the base metal qualification for welder you have to follow QW-423 as per SEC IX.

Regards,

P.B.R

 P.BalajiRajan,
Inspection Engineer,
Velosi Certification LLC,
P.O 3408 Doha-Qatar.
-------Original Message-------
 
Date: 3/19/2011 12:17:19 PM
Subject: Re: [MW:10429] Welder's qualification for diffrent steels and steel alloys.
 
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
Narendra Gohil
Welding Engineer
QAFCO
Ph.+974-44228289(O)





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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Sukamal

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