weld metal, e.g. a weld metal with 3-8% ferrite. Have you checked the welding consumble? This could be the source of magnetism.
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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