Welder's qualification for diffrent steels and steel alloys.

[Narendra Gohil]

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)

[Sukamal Naskar]

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

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
Sukamal

[Narendra Gohil]

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

[Karthik]

Hi, as per 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. So,P.No.Qualification range shall be As per QW423.1.But you have to refer all other essential variables QW352 to 357. Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Sat, 3/19/11, Narendra Gohil <ngo...@qafco.com.qa> wrote:

[Sukamal Naskar]

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

[pbre...@gmail.com]

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-------

[Arun Das]

Dear Mr.Gohil,

As per my understanding even if the P number changes with in the limits, as you mentioned on the first mail, no separate qualification is required, but F number is also an essential variable as per the SEX 1X QW 353 & 356. So because of that you may have to do new qualification.

No qualification is required only if none of the essential variable data change. Just don't look only into P number but look into all essential variables.Technically speaking if P numbers are within the range no separate qualifications are required, but when P-number  changes F-number may change which will lead to a new qualification.

regards,
 

Arun S Das

---

From: "pbre...@gmail.com" <pbre...@gmail.com>
To: material...@googlegroups.com
Sent: Sat, 19 March, 2011 3:45:51 PM
Subject: Re: [MW:10436] Welder's qualification for diffrent steels and steel alloys.