[MW:11153] RE: 11128] QW 304: Welders

Hi Abhishek,

 

GMAW Process short circuit have a tendency to give LOF.LOF is hard to find during RT.Mech. Testing Side bend testing opens up a LOF:

Hope this will help you out.

 

Thanks

Regards,
Prakash Verma

Aker Drilling Risers
Aker Solutions
MOBILE - 0047-40466591
DESK- 0047-22945932
Email: Prakash.Verma@akersolutions.com

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of John Henning
Sent: 25. mai 2011 17:45
To: materials-welding@googlegroups.com
Subject: [MW:11144] RE: 11128] QW 304: Welders

 

Short-circuiting mode GMAW receives special treatment because it has a history of welds being made with small, tight  lack of fusion defects both at the side wall and between weld beads/layers.  These are typically not detectable by RT but will open up when bend tested.  These defects are the result of weldor technique.  Understand that RT is an exemption/or permitted substitution for the required bend testing  In this case the use of RT as an exemption/substitution is not extended to the GMAW-S process.

 

John

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ABHISHEK GHOSH
Sent: Monday, May 23, 2011 3:17 PM
To: materials-welding@googlegroups.com
Subject: [MW:11128] QW 304: Welders

 

Dear Experts, 

 

As per ASME IX 

 

QW-304 Welders :

 

Except for the special requirements of QW-380, each  welder who welds under the rules of the Code shall have  passed the mechanical and visual examinations prescribed

in QW-302.1 and QW-302.4 respectively. Alternatively, welders making a groove weld using SMAW, SAW, GTAW, PAW, and GMAW (except short-circuiting mode)

or a combination of these processes, may be qualified by radiographic examination,

 

WHY SHORT- CIRCUITING MODE IS EXCEPTIONAL  ??? 

 

Regards.

 

Abhishek Ghosh 

--

ABHISHEK GHOSH
FAHAHEEL, KUWAIT
MOB: (00)965-60303798

 

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