Re: [MW:34998] Cold pass

When stringent like G48 Corrosion test -weight loss (< 1 gm )test is imposed by Client specification, then overalloyed TYP 2594 is deployed to meet stringent corrosion rate requirements 

Thanks 

Vishwas

IWE

9823472273

Sent from my iPhone

On 16 May 2024, at 3:28 PM, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:



Hot pass to be welded immediately after welding Root pass at higher Heat Input as specified by API 1104 for pipelines where time between root and hot pass is an essential variable. for CS & LAS. 

IN DSS cold pass to be welded in single bead at 75% of the Root pass Heat Input to avoid over heating of root which may lead to formation of secondary austenite and intermetallic phases like Sigma phase etc.. which results in failure of ASTM G48 tests.

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Thanks & Regards

J.Gerald Jayakumar

0091-8838619635

On Thursday, 16 May, 2024 at 02:23:17 pm IST, RITHVIK Suresh <rithviksuresh98@gmail.com> wrote:

Dear Experts,

1.Can anyone tell me what is meant by Cold pass in Dss/Sdss welding. Also please tell me the difference between Hotpass and Cold pass.

2.In DSS Pipeline welding Root pass is being performed with SDSS consumable and rest is performed with DSS consumable.  Can anyone explain me why it is performed like this

Thank you 

Rithvik 

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