Tandem SAW for SA 240 Type 304 100mm thick

[Hrushikesh Sangamnerkar]

Dear all,

Base Material: SA 240 Type 304/304L

Filler Metal : SFA 5.9 ER 308/308L (2.4mm/3.15mm dia)

Joint Design: "J" groove

Root face : 5mm

Back chip is allowed.

I am in process to qualify PQR for Tandem SAW. 

Since thermal conductivity of SS is low. 

1) What precautions are required to be taken while caring out Tandem SAW specially for SS.

2) Are there chances of solidification cracking? If yes, what can be the possible reasons and precautions to be taken.

3) Does thermal conductivity have any role to play with cracking?

Kindly provide your suggestions.

Awaiting the reply.

Thanks and regards,

Hrushikesh H Sangamnerkar

09724738118

[Ramin Kondori]

Dear Hrushikesh:

Hot cracking should not be your main concern but impact test might cause you problems.

I had an experience with 304L (67mm) plate and we used 3.2mm wire (single arc SAW) and we were checking interpass temperature regularly.

In tensile test, elongation did not reach min requirement.
Our impact test was at -120 deg.C and almost all specimens, had a shear type fracture surface with very low lateral expansion (rejected). Impact tougness were mostly between 28 and 40 J.

If you use tandem arc, heat input will be higher and you may face problems.

Of course we were using K-configuration for our joint and yours is J-configuration which is much better.

I do not recommend you tandem arc unless you use small diameter wires (1.6mm) in which heat input is not much different than that of single arc with larger dia wires (2.4mm). So my recommendation is to use single arc. Keep interpass temperature as low as possible (even cooling with water etc.).

Regards

Ramin Kondori

Sr. QA/QC Engineer

SINOPEC

r.ko...@petroyada.com
+98-2123592322
+98-9132150320

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[manisch .]

Please, take care of process variables to avoid hot cracking particularly you should be concerned about wire feed rate, of the both the trailing and the leading filler wires.
Interpass temperature with subsequent cleaning of the beads should also be monitored.
Moreover as described the joint configuration and wire size need to chosen smartly to avoid any entrapment of slag.

Obviously, thermal conductivity is going to play an important role, in that regard I suggest you to select optimum heat input and to use a granular flux.

Please refer to the attached text.

--
Manisch Kumar,

email- tetr...@gmail.com,tetra...@rediff.com

[pgoswami]

Hrushikesh,

 

Please see the recommended high quality product for SAW of austenitic stainless steels. The highlighted texts are of importance. Similar products are available with ESAB, Thyssen Bohler and other welding consumable manufacturers. Tandem SAW always is a success with DC/AC or AC/AC combination. DC/DC could be the least favoured due to arc blow problems.

 

Heat input should be controlled within 3-3.2 Kj/mm max, with 2.4 mm dia wire as the best option. Solidification cracking is not a major concern with the high tech fluxes available these days.

 

Hope to hear from on you on the further developments on this issue.

 

Regards

 

Prada Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgos...@quickclic.net

pgos...@sympatico.ca

 

 

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of manisch .
Sent: Tuesday, October 15, 2013 2:09 AM
To: material...@googlegroups.com
Subject: Re: [MW:18946] Tandem SAW for SA 240 Type 304 100mm thick

[manisch .]

This paper particularly deals with the duplex steel welding by SAW and resulting imperfections due to heat input, but considering the process variables as near to SS as for the DSS....I hope it gives you a better understanding of "What precautions are required to be taken while caring out Tandem SAW specially for SS" and ' role of  thermal conductivity have on cracking'......

On Mon, Oct 21, 2013 at 10:34 AM, manisch . <tetr...@gmail.com> wrote:

Dear Mr. Hrushikesh,

For your further reference, a good paper " Welding imperfections of submerged arc welded duplex steel joints in aspects of the welding heat input" on SAW heat input effects as related to stainless steel..

Please find the attachment.

--
Manisch Kumar,

email- tetr...@gmail.com,tetra...@rediff.com

[manisch .]

Dear Mr. Hrushikesh,

For your further reference, a good paper " Welding imperfections of submerged arc welded duplex steel joints in aspects of the welding heat input" on SAW heat input effects as related to stainless steel..

Please find the attachment.

On Tue, Oct 15, 2013 at 9:39 PM, pgoswami <pgos...@quickclic.net> wrote: