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.. On Tue, Oct 15, 2013 at 9:39 PM, pgoswami <pgoswami@quickclic.net> wrote:
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.RegardsPrada Goswami, P.Eng,IWEWelding & Metallurgical SpecialistOntario, Canada
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manisch .
Sent: Tuesday, October 15, 2013 2:09 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:18946] Tandem SAW for SA 240 Type 304 100mm thickPlease refer to the attached text.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.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.
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.--
On Mon, Oct 14, 2013 at 9:00 PM, Ramin Kondori <raminkondori@gmail.com> wrote:
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.).Of course we were using K-configuration for our joint and yours is J-configuration which is much better.If you use tandem arc, heat input will be higher and you may face problems.In tensile test, elongation did not reach min requirement.Dear Hrushikesh:I had an experience with 304L (67mm) plate and we used 3.2mm wire (single arc SAW) and we were checking interpass temperature regularly.
Hot cracking should not be your main concern but impact test might cause you problems.
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.
Regards
On Sat, Oct 12, 2013 at 6:58 PM, Hrushikesh Sangamnerkar <hrushi612@gmail.com> wrote:
Dear all,--Base Material: SA 240 Type 304/304LFiller Metal : SFA 5.9 ER 308/308L (2.4mm/3.15mm dia)Joint Design: "J" grooveRoot face : 5mmBack 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 Sangamnerkar09724738118
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