Wednesday, September 30, 2009

[MW:3391] Re: 3297] 3295] Welding qualification of very low sulfur steels.

I'm a member of this group and have been following this discussion with some interest. I am attaching a summary of a position on the need for controlling the S level in type 316LN stainless steel that will be autgeneously G.T.A welded in the form of small diameter thin-walled tube. Any comments or feedback is welcomed. I also hope that some of the information that I'm posting will be of value to others.

Ed Dalder


----- Original Message -----
From: "John Henning" <jhenning@deltak.com>
To: materials-welding@googlegroups.com
Sent: Tuesday, September 29, 2009 7:43:31 AM GMT -08:00 US/Canada Pacific
Subject: [MW:3371] RE: 3297] 3295] Welding qualification of very low sulfur steels.

In the past, super clean steels were investigated by EPRI and others.  It was found that if the sulfur is extremely low, one can experience arc wander and significant difficulty in obtaining a quality weld.  Just a wee bit is good thing from a welding stand point.  I don't have access any longer to these reports so I cannot provide any additional information.
 
John 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram (Mumbai - PIPING)
Sent: Wednesday, September 23, 2009 11:53 PM
To: materials-welding@googlegroups.com
Cc: piping_valves@yahoogroups.com
Subject: [MW:3297] 3295] Welding qualification of very low sulfur steels.

Dear Kannan

Welcome on board after long time

 

Before seeing the link provided below, I thought you were asking for a CS material, and quite surprised by this claim that low sulfur will affect the weld quality?

Sulfur is an impurity in terms of steel making, and even weldability point of view, it was never an issue at least for process plant equipment or piping welding, the lower is the better.

It is quite common for offshore O&G application (where HIC/SOHIC/SSCC is envisaged) with such low sulfur content (Dillinger is one such manufactures for plates, their Dicrest series plates are guaranteed with S £ 0.0010 %).

Your specified sulfur conentnt restriction is for SS or CS ( or Duplex?)

 

The article mentioned in the below link related to small dia SS tubing welded with Autogenous Orbital GTAW, it's a typical case. Never an issue for our type of applications  


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of S. Kannan
Sent: Thursday, September 24, 2009 12:05 AM
To: materials-welding@googlegroups.com
Subject: [MW:3295] Welding qualification of very low sulfur steels.

 

----- Forwarded Message ----
From: kannan_cit <kannan_cit@yahoo.com>
To: piping_valves@yahoogroups.com
Sent: Wednesday, September 23, 2009 7:26:46 PM
Subject: [piping_valves] Welding qualification of very low sulfur steels.

 

Quit some time ago, I was having great difficulty in finding mills manufacturing steels with sulfur limited to 0.001% max. due to a wrong prescription by one of the well known PMC. Though it was resolved with higher relaxation later, I started to look into the issues concerning the restrictions posed in the sulfur content in steels, which were mainly added to increase the machinabilty, in various applications including the H2S/Sour service applications. The article in the link provides an insight in welding a low sulfur material.

The issue in the context of welding is that, while sulfur content is reduced the surface tension is reduced resulting in wider concave welds with lesser penetration, which pose a problem in thick walled pipes which are common in sour services. The insert ring solution proposed in the link below may solve the problem of higher weld penetration, which calls for different weld procedure. Similar to ASME BPE standard's prescription of limitation on, weld sulfur with appropriate quality check, does such requirement called in the BPV.

I seek our member's suggestion on the subject of welding procedure qualification, in such applications where sulfur content is restricted from 0.002% to 0.010% in sour/H2S applications.

http://www.thefabri cator.com/ tubepipefabricat ion/tubepipefabr ication_article. cfm?ID=533

With regards,
Kannan

__._,_.___





--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:3390] Mig Welding Application

Dear All,


We are try to weld a 5mm Strip to a tube of wall thickness 2mm Mild
Steel [ O_ ] In this position. We need to weld vertically and from
both sides at the same time front and back. Is it ok to do so ? Will
there be a problem if we weld both from front and back at the same
time ? Is it better to weld one side first then the other ? We are
using 1.0 mm solid wire and CO2 as gas.

Regards,

--
Nimesh S Chinoy

--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:3389] Re: Crack

Dear Mr Moorthy,

Please submit the welding procedure specification (if it exists) and the exact base material analysis from the certificate.
I need to know the bead positioning, the heat input and the basematerial analysis of the cracked plate as a minimum.
The hardness of the HAZ in the cracked plate can give an indication as well.

Regards,

Huub.



2009/9/29 bdsathiyamoorthy <bdsathiyamoorthy@gmail.com>
Dear All,
 
I am doing tank construction. I have found some cracks on the pad toe and pad corner. Shell thk 38 mm, pad thk 30 mm and fillet weld size 21 mm. we were controlled everything. (electorde quiver temp. preheat, oven temp. before start welding good cleaning and etc).
 
Material details :
 
Shell mat'l  : A537 
Pad mat'l   : S275 Gr J
 
Electrode    : E7018
 
Pls any one can sugest to me the causes and prevention.
 
Regards,
Moorthy.
 
 
 
 




--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:3383] RE: 3382] try to unsubscribe from this group for this ID

To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com

 

BR


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of rahul.pisat@akersolutions.com
Sent: Wednesday, September 30, 2009 1:46 PM
To: materials-welding@googlegroups.com; materials-welding-unsubscribe@googlegroups.com
Subject: [MW:3382] try to unsubscribe from this group for this ID

 

Hello

 

How to unsubscribe from this forum ?, I would like to unsubscribe from this forum for this email Id?

I got a  delivery failure message for the email id mentioned in Group site

 

Rahul Pisat
Engineer - Material Engineer
Tel:-  +31 79 368 8655
Email :- rahul.pisat@akersolutions.com

 

Aker Process B.V.
, PO Box 5254, 2701 GG  Zoetermeer, The Netherlands
H  Houtsingel 5, 2719 EA  Zoetermeer, The Netherlands 
(  +31 (0)79 368 8688
7   +31 (0)79 368 8555
Registered with the trade register of the Chamber of Commerce in Den Haag, The Netherlands, No. 27081325   

 



--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:3381] RE: 3376] Re: Electrode for LTCS A333Gr6

Hi,

 

For better achieving impact at -46 Deg.C, E 7016-1 (Root) + E7018-1(Hot, Fill and Cap) also recommended, since both are tested at -45 deg.C.

 

Note: Check your LAST requirement and choose the consumable accordingly.

 

Regards,

Vasanth


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of amarjit Singh
Sent: 29 September 2009 16:13
To: materials-welding@googlegroups.com
Subject: [MW:3376] Re: Electrode for LTCS A333Gr6

 

Dear Kaushik,

 

SA 333 Gr 6 is generally recommended upto -46 deg C so you can use E7010 for root pass & E7018-1 for filling & capping or for better control you can also use GTAW root

 

Amarjit singh

On Mon, Sep 28, 2009 at 5:58 PM, checks patel <checkspatel@gmail.com> wrote:

Dear All,

 

I have a U/G pipeline of ASTM A 333 Gr.6 (LTCS) for 2 KM.

 

Which Electrode I can use for root pass and other pass and with which techniqe.

 

 

Regards,

 

Kaushik

 




--
Amarjit Singh


*** WORLEYPARSONS GROUP NOTICE *** "This email is confidential. If you are not the intended recipient, you must not disclose or use the information contained in it. If you have received this email in error, please notify us immediately by return email and delete the email and any attachments. Any personal views or opinions expressed by the writer may not necessarily reflect the views or opinions of any company in the WorleyParsons Group of Companies."
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:3377] RE: 3373] filler wire for copper

What type of copper it is, oxygen bearing or oxygen free? It is
difficult to weld oxygen bearing copper
Some times CuSi type filers are an added advantage due to its fluidity,
consult a consumable manufacturer with correct type/grade or UNS# of the
material

Helium (or He+Ar mixture) can be selected as a shielding gas because;
risk of oxide entrapment in the weld pool is greatly reduced and
provides deeper penetration

Preheating of the base metal is typically required to maintain the base
metal at welding temperatures without preheating, the high thermal
conductivity of copper results in excessive loss of heat away from the
weld zone.

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of gajjalla surya
prakash
Sent: Wednesday, September 30, 2009 11:47 AM
To: materials-welding@googlegroups.com
Subject: [MW:3373] filler wire for copper


dear all ,

can any one suggest me the filler wire for GTAW process for weld 12mm
thk Pure copper to copper plate(99.3%)

--
With regards,

Surya Prakash Gajjalla


Filtered by Hosted Filtering

--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:3379] Re: Hydrotest flange thickness calculation

CARBON STEEL  
-  INPUT DATA  - INCH UNIT METRIC UNIT
1. MATERIAL  : ASTM A515 GR.70  
ALLOWABLE STRESS(by B31.3) : 23100.00 Psi 1624.00 ㎏/㎠G
2. CORROSION ALLOWANCE (C) : 0.05 inch 1.30 mm
3. PIPE QUALITY FACTOR(carbon은 1) : 1.00   1.00  
4. DESIGN PRESSURE(Kg/cm2G) : .00 Psi 57.00 ㎏/㎠G
5. DESIGN TEMPERATURE( ℃) : .00 75.00
6. FLUID :    
 
-  OUTPUT DATA  -  
1. The equation for wall thickness calculation based on ASME B31.3  
 
tm  =  dg√(3P/16SE) + C  
 
where,  
         tm  :  minimum required wall thickness in  mm.  
          dg :  inside diameter of gasket for raised or flat face flange or the gasket
                  pitch diameter for ring joint and fully retained gasketed flanged  
           E :  joint efficiency or pipe quality factor  
           P :  design pressure  
           S :  allowable stress  =  ㎏/㎠  
           c :  sum of allowance defined in para. 304.1.1
 
Using this formula the Thickness caluculates to 152.5 mm , Try for yourself if this could be helpful.


On Sun, Sep 27, 2009 at 5:36 PM, Chaitanya Purohit <chaitanya_purohit@yahoo.co.in> wrote:
Dear Friends,

Please help to reply to the below query....

---------- Forwarded message ----------
From: Mithun Murali <Mithun.Murali@dodsaldxb.ae>
Date: 2009/9/27
Subject: Query regarding Hydrotest flanges
To: chaitanya_purohit@yahoo.co.in

Hi Chaitanya,

Can you ask this query in the group as I am unable to do so.

Any calculation sheet or method available for Thickness calculation for Blind Flange for 64 " CS pipeline hydrotest.(test pr of 83 barg), 400# rating.

I had referred to one of the Client spec, which demands 170mm thick plates for the same.

Any reference of Agency or Consultant doing these kind of Calculations.

 

Thanks and regards,

Mithun

Design Engineer - Piping

Dodsal Engineering & Construction Pte. Ltd.

Dubai, U.A.E.

Phone : +9714-3161279






--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
-~----------~----~----~----~------~----~------~--~---

[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

Hello,   Please see the response below.   Regards.   P. Goswami, P. Eng, IWE.   From: materials-welding@googlegroups.com <materials-weld...