RE: [MW:5474] RE: 5437] welding Pipe API 5LX52 to Flange ASTM A105

It is the preferred method to use ONLY uphill welding when using a stick welder for fear of slag inclusions in the finished weld

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of N VENKATESWARA PRASAD
Sent: Tuesday, June 08, 2010 9:02 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:5466] RE: 5437] welding Pipe API 5LX52 to Flange ASTM A105

 

Dear Mohammed,

 

What is size of pipe and Flange.  As per API 1104 and also as per many client specifications calls for repair procedures.  So to have better quality it is prudent to Root with TIG welding with ER 70S3 and followed by E 7018 with full up hill welding.  The welding quality in up hill welding is better than down hill welding.   Down hill welding is only preferred for higher productivity.  For fittings as per Qatar petrolium specifications only up hill welding is allowed.  You must do preheating also as the flanges are of higher mass.  Do preheating up to 100 C.

 

Regards

 

N.V. PRASAD

WELDING ENGINEER

VELOSI CERTIFICATION., QATAR

009745974703

On Tue, Jun 8, 2010 at 11:07 AM, Prabhu Kumar L <l.prabhukumar@saipem-india.com> wrote:

Dear Mohammed,

 

You can follow any one of the option for welding of X52 to A105.

 

1. Root pass with E6010 and rest by E7010 by uphill or dollymix (root-uphill and rest-downhill) progression.
2. Root pass with E6010 and rest by E7018 by uphill progression

 

No restriction on use of cellulosic or low hydrogen electrodes for welding of pipe to fittings/ flanges. However, for any repair welding, it is recommended to use low hydrogen electrodes in order to reduce hydrogen induced cracking problems.

 

Regards,

 

L. Prabhu kumar,

Sr. Principal Engineer,

 

Equipments & Materials Dept.,

Saipem India Projects Limited,

Nungambakkam High Road, Chennai - 600 034, India.

Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,

Mobile Ph. No.: +91 9003010978.

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mohammed helal
Sent: Monday, June 07, 2010 11:09 PM
To: materials-welding@googlegroups.com
Subject: [MW:5437] welding Pipe API 5LX52 to Flange ASTM A105

 

For welding Pipe API 5LX52 to Flange ASTM A105  in a pipe line project we should use 7018 or 7010 is enough to give us the desired quality.( i think that fitting to fitting we have use 7018 but fitting to pipe, can we use 7010) Eng.MOHAMMED ABD EL-AZIM HILAL         MECHANICAL ENGINEER      CSWIP 3.1 - NDT (RT- MT - PT) OTISHAN CONSULTANT ENGINEER  00966-502612218  -  0020103124557

 

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