As your client is doubting that you might have used CS filler wire for root run and rest with SS filler wire, then to clear his doubts, weld one similar joint mockup in his presence with your WPS and show him that it is magnetic.
Also ensure that you are using SS wire brush for interpass cleaning.
In ASS min. 3 FN is required in weld deposit to prevent hot fissures.
Regards
Prem Nautiyal
On Tue, 19 Jan 2010 15:48:09 +0530 wrote
>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 requirementis given by client specification, For clear detail please refer AWS handbook - Volume 1.
>
Louis
Welding Engineer
Singapore
>--- On Fri, 15/1/10, suneel gore
>
>From: suneel gore
>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)
>
>From: Singh Rishi (TIPO - QA/QC)
>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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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.
PREM S NAUTIYAL
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