Re: [MW:17380] 17331] Downhill Welding Applications

Mr. Lalu,

In the down hill position, the travel speed is said to be faster by 1.5  in SMAW and more than 1.5 to 2 time in MIG

welding process.

This higher travel speed no doubt reduces the  heat input but also allows  a higher productivity, specially in cross

country piping where the total pipe lengths run hundreds and thousands of kms. compared to plant piping.

Further the plant piping has 100% radiography compared to an avg. of 10% in cross country piping, hence we can

use vertical  down to increase productivity even though the defects level like LP, LF  U/C  are expected in someweld

joints.

Vertical down welding is commonly used  in sheet metal fabrication (below 4 mm) where over heat in put may case

burn-through  in the the thinner sections.

Sridhar.

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Lalu r p
Sent: 10 April 2013 13:08
To: materials-welding@googlegroups.com
Subject: [MW:17331] Downhill Welding Applications

 

Dear Experts 

 

 Why we use downhill position for cross country pipelines.Is there any other areas  where we use downhill position.

 

Regards 

 

LALU R.P

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