However the welding consumable manufacturer have opined that due to ferrite content in SMAW process they cannot guarantee impact at such low temperatures at minus 196 degree Ceclius.
On Thu, 17 Aug 2017 11:59:26 +0530 "'james gerald' via Materials & Welding"
> I suppose there is some problem with the selection of material, SS 321/347, which contains Titanium / Niobium which are Ferrite formers and for -196degC service why do you need IGC control. Try 304LThanks & RegardsJ.Gerald Jayakumar0091-9344954677
From: Pandithan
To: PREM SHANKARDUTT NAUTIYAL
Cc: materials_welding
Sent: Thursday, August 17, 2017 10:12 AM
Subject: Re: [MW:26723] ER 347 Vs E347 CVN impact values
For TIG, try with ER321
On 16-Aug-2017 11:54 PM, PREM SHANKARDUTT NAUTIYAL
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Dear friends
A vessel will be fabricated as per EN 13445 - 2014 edition.
As per contract impact test is mandatory at minus 196 degree Celsius with Min. Impact value of 40J.
Base material is SS 321.
Thickness ranging from 10mm to 20mm.
Two separate PQR are being conducted as per EN ISO 15614-1.
1. Complete TIG with ER 347 with controlled heat input less than 1KJ/mm
PQR coupon thickness was 14mm.
= impact values are coming on weld avg 30J - Failed.
HAZ = @ 55 J and passing.
Now trying PQR with other brand.
2. Complete MMAW = E 347 - Here consumable manufacturer in India have regretted impact properties at minus 196 degree Celsius.
Both TIG and MMAW consumables are having @ 8 FN.
Then why MMAW Consumable manufacturer in India have regretted impact properties at minus 196 degrees Celsius for MMAW process E347 ?
Difficult to understand !
Regards
Prem Nautiyal
IWE
PREM S NAUTIYAL
CELL : 9769316004
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PREM S NAUTIYAL
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