[MW:24891] Re: 10246] ASME IX - Welder's qualification Thickness range

Hello,

Im actually curious about the ratio by which a Test Specimen is drawn from a Welded plate that is joined during Welder qualification test.

Means if we have given with a specific thickness and length, breadth Welded plate, then which size of test specimen to be produced from that jointed piece for Tension Test or guided bend test?

Help me with this.

On Thursday, March 10, 2011 at 8:37:14 PM UTC+5:30, 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  {Section VIII, Division 2, Article F3 has been replaced by QW-193, QW-288, QW-303.5}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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