SAW for SS

[PREM SHANKARDUTT NAUTIYAL]

Hi friends

The Job is a vessel and construction code is ASME Sec III NB.
The MOC is SS304L.
The O.D of the shell is 8 (eight) metres, thickness = 30mm, Height of shell is 2700mm.
We want to fabricate two shells of this type.
Each shell has three long seams.
Then both these two shells will be welded by one circ. seam.
I have decided a double V joint with SMAW process from inside welding.
From inside of the shell there will be lot of spiders / fixturing.

I have a few queries:

1)can i deploy SAW process from outside after chipback ?
2) What dia. of SAW wire i have to use ?
3)Can SAW boom reach at such height of 8 metres ?
We have a Lincoln SAW power source of 1200 A.

4)Has anyone used SAW for SS welding of such huge diameters in past ??

5)What is the optimum thickness in SS that can be welded by SAW to get least distortion ?

The PQR calls for ASME SecIX tests + IGC practice E requirements to be met..
6)Can we use Double operator TIG and then SMAW from Inside + SAW from outside ?

Regards

Prem Nautiyal

PREM S NAUTIYAL
CELL : 9820313278

[PB HEGDE]

Hi Friends

My opinion given below

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of PREM SHANKARDUTT NAUTIYAL
Sent: Thursday, April 08, 2010 12:51 PM
To: material...@googlegroups.com
Subject: [MW:4750] SAW for SS

 

Hi friends

The Job is a vessel and construction code is ASME Sec III NB.
The MOC is SS304L.
The O.D of the shell is 8 (eight) metres, thickness = 30mm, Height of shell is 2700mm.
We want to fabricate two shells of this type.
Each shell has three long seams.
Then both these two shells will be welded by one circ. seam.
I have decided a double V joint with SMAW process from inside welding.
From inside of the shell there will be lot of spiders / fixturing.

I have a few queries:

1)can i deploy SAW process from outside after chipback ?/ YES
2) What dia. of SAW wire i have to use ? (you can use 3.2 dia
3)Can SAW boom reach at such height of 8 metres ? On stool you can keep the col and boom and have a scaffolding till that height to avoid any accident
We have a Lincoln SAW power source of 1200 A. (I think Lincoln have DC1000/ 1500 or DC600

4)Has anyone used SAW for SS welding of such huge diameters in past ?? Yes

5)What is the optimum thickness in SS that can be welded by SAW to get least distortion ?

The PQR calls for ASME SecIX tests + IGC practice E requirements to be met..

6)Can we use Double operator TIG and then SMAW from Inside + SAW from outside ? For root + hot pass you can use DOT

Regards

Prem Nautiyal

PREM S NAUTIYAL
CELL : 9820313278

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[PREM SHANKARDUTT NAUTIYAL]

Dear Sir

I would like to know the optimum thickness in Stainless steel suitable
for SAW welding.
We also have SS shells of 20mm thicknes and presently we are using only SMAW process for it with chipback. Can we go for SAW ?

Also we have a Lincoln IdealArc DC 1000 powersource on which the Ammeter shows upto 1200A reading !!

Regards

Prem Nautiyal

On Thu, 08 Apr 2010 19:04:42 +0530 wrote

[Muhammed Ibrahim]

Dear Prem,

 

Definitly you can use SAW. We have done it for 20 - 30 thk also. Better avoid chip back providing a PQR with double operator GTAW (Twin GTAW) for root pass.

 

Regards,

 

Ibrahim

Thanks & Regards
Muhammed Ibrahim PK

[amarjit Singh]

Dear NAUTIYAL,

 

since the MOC is SS304L with 8m dia, 30 mm thick having  3 long seam within one shell course following should be the approach of welding for better control on distoration.

 

1) weld preparation equal V .

2) Setup of seam in vertical axis with fixturing.

3) use of DOT with GTAW.

4) then parallel welding with SMAW from both side.

 

After welding with DOT SMAW ned to be comenced in free condition from both side for better control

 

SAW should be avoided in such type of joints

 

Amarjit Singh 

TEMA INDIA LTD

 

 

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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Amarjit Singh