[MW:26979] Re: 10246] ASME IX - Welder's qualification Thickness range

Thanks for your answer.

I have a doubt, 13 mm thicknes Pipe welded by GTAW+SMAW, as per code minimum 3 layes are requied so if GTAW 2 pass and SMAW also 2 pass , so he cannot weld unlimited thickness na?

On Thursday, 10 March 2011 18:07:14 UTC+3, John Henning wrote:

You are correct, provided only a single welding process is used to weld the coupon.  The requirement is for the weld process to deposit a thickness of ½" (13mm) or greater. 

 

If you welding pipe or tube, you must also consider the groove weld diameter limits table, QW-452.3.

 

As an example,  I often want to qualify a welder to perform pipe welding with a GTAW root and hot pass  followed by FCAW to fill the joint.  Therefore, a 13mm coupon will not be sufficient to get unlimited thickness qualification for the FCAW process.  As I am satisfied with a minimum 2-7/8" (73mm) diameter qualification, I will use either a 6 inch – Schedule 160 or schedule XX coupon and specify that there be a minimum of ½ in. (13mm) of joint left unwelded after completion of the GTAW portion.  The welder will be qualified for 2t_GTAW  and unlimited for FCAW.

 

Note that corrosion resistant overlay, hard facing overlay, and temper bead welding have their own qualification rules.  Tube-to-tubesheet welding will be qualified unless demonstration or mock-up testing is required per QW-193 by Code section or customer specification.  {Section VIII, Division 2, Article F3 has been replaced by QW-193, QW-288, QW-303.5}

 

Let me know if you have additional questions.

 

John  

 

From: material...@googlegroups.com [mailto:mate...@googlegroups.com] On Behalf Of Zakaria ghrab
Sent: Wednesday, March 09, 2011 11:14 AM
To: material...@googlegroups.com
Subject: [MW:10246] ASME IX - Welder's qualification Thickness range

 

Hi all,

  As per ASME sect IX table QW-452-1(b), for welder's qualified in test coupon thickness greater or equal than 13 mm, he's will be qualified to wed thickness " Maximum to be welded"

May my interpretation is true ??
In this case, Can i  qualify all welder's in 13 mm thickness, he will be qualified for all thick ( PWHT is not essential variable for welders) and cover all thickness range ?

Regards

--

زكرياء غراب
GHRAB Zakaria
مسؤول عن الجودة
QA/QC SENAD
مشروع المحطة الحرارية ـ الوحدة الرابعة
المحمدية ـ المغرب

 

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