Hi Sunnel, In Austenitic stainless steel welding one of the susceptiablity problem is hot cracking. So avoid this problem, need some delta ferrite in welding ( which is maganetism) .So consumable manufacturing is carried out based on this ferrite requirement. In my previous projects 3 to 8 FN requirement is given by client specification, For clear detail please refer AWS handbook - Volume 1.
Louis Welding Engineer Singapore
--- On Fri, 15/1/10, suneel gore <novatekcorp@yahoo.co.in> wrote:
From: suneel gore <novatekcorp@yahoo.co.in>
Subject: Re: [MW:4050] Magnetism in SS 304 & 321 after welding
To: materials-welding@googlegroups.com
Date: Friday, 15 January, 2010, 10:17 AM
| Sir One of my customer also have faced similar problem , in case of welding SS 304 & 316 Plates , Tacking By E 316-16 Electrodes & welding by ER 316L FIller wires The welded are attracts magnet , but same on filler , or plates or on stub ends it does not Pl let us know If is it the case of residual magnetisumdue to DC Welding ? How it can be avoided? Pl guide us Regards Suneel Gore
--- On Thu, 14/1/10, Singh Rishi (TIPO - QA/QC) <R.Singh@Panipat.ticb.com> wrote:
From: Singh Rishi (TIPO - QA/QC) <R.Singh@Panipat.ticb.com>
Subject: [MW:4045] Magnetism in SS 304 & 321 after welding
To: materials-welding@googlegroups.com
Date: Thursday, 14 January, 2010, 6:25 PM
One of my friend is facing a problem, which I'm putting to the group as I'm not sure about the solution.. SS joints after welding has becoming magnetic ( Ferrite number is not a criteria for these joints) and hence attracted by magnet ( including Socket Joints )- mostly pipe to fitting joints , but his Client is doubting that they are becoming magnetic because it's root has been welded by CS filler wire- rest passes by SS filler wire. This , he insists is done by welder to do the job faster and save purging- as per his past experience in some Gulf project. There are some thousand of SS joints ( 304, 321 ) in his plant, which is ready. What can be done, apart from PMI & Ferrite ( on which he doesn't have much faith as they show the reading of the Final pass ) , to convince him about the integrity of the joint without cutting/ drilling / damaging the joint. Please share any literature which relates Magnetism to the Welding/ Ferrite percentage. Welding Processes involved are GTAW (mandatory for all root welding ) and SMAW ( for above 8mm thk ) Thanks & Best Regards,
Rishi Raj Singh
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