[MW:18563] About Ferrite Content in GTAW & SMAW

Dear Metallurgy Experts ,

Please clarify my doubts about the following and with ref. to the attachments :

I have received Welding Consumable Test Certs for GTAW SFA 5.9 Class ER308L and SMAW SFA 5.4, Class E308L-16 , in which the Ferrite content shows 10.4 in GTAW and 4.3 in SMAW consumables test Certs.

Is there any specific reason behind this much difference in between  GTAW & SMAW ferrite contents . I need your explanation on this matter.

Also, just for your info, When I do some spot check using FerriteScope on the WeldCap ( GTAW on Root and Hot Pass & SMAW welded until Cap  ) , the FN shows 6 to 8 and rarely 9 on weldcaps.

Awaiting for your reply .

Regards ,

Saravanan,

Korea

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