[MW:26722] ER 347 Vs E347 CVN impact values

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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