why do we use dollymix welding technique in pipelines?

[aslam khan]

dear all ,
i want to know why do we use dollymix welding technique in pipelines?thanks

[pirama rayan]

Dear Mr.Khan,

 

To minimise the Heat Input,we are using Dollymix welding Technique.

 

Thanks.

 

Piramaryan B

Welding Engineer -CSWIP SCWI 3.2.2

ILF CONSULING ENGIEERS (PMC) KSA

 

On Wed, Aug 11, 2010 at 8:41 PM, aslam khan <aslam...@gmail.com> wrote:

dear all ,
i want to know  why do we use dollymix welding technique in pipelines?thanks

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[IMRAN KHAN]

DEAR         Mr.Pirama rayan   kindly explain me 1-how heat input will be minimise in dollymix technique in pipeline? 2-for what purpose we are using this method?   by KHAN ksa     --- On Sun, 15/8/10, pirama rayan <piram...@gmail.com> wrote:

[pirama rayan]

Mr.Khan

 

As you know , Dollymix Technique means combination of use of both uphill and downhill progression during welding.

 

If you use Uphill Progression alone ,there will be high heat input for lower thichness pipelines .That's why we use this technique.

 

Hope you cleared now.

 

thanks.

 

Piramarayan B

Welding Engineer-CSWIP SCWI 3.2.2

ILF Consulting Engineers (PMC),KSA