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[MW:14422] SS347 overlay but FN is too low

By Materials & Welding
Dear all,

I have encountered that Ferrite No is too low for SS347 overlay to P1
(SAW).

I used ESAB ER309L & ER347 together with OK flux 10.93 and heat input
is about 0.9 - 1 kJ/mm.

My Ferrite no is as bellow . (check by Ferrite scope)

1st layer 309L (2mm thk from BM) , FN no. < 0.5

2nd layer 347 ( 4 mm thk from BM) , FN no < 2

3rd layer 347 ( 6 mm thk from BM) , FN no < 3.5

Required FN is 5 to 11 FN,

My welding parameters are as follow.

For 309L , 280 – 330 A, 30 – 32 V , travel speed 720 – 800 mm/min

For 347 , 330 – 350 A, 32 – 34 V , travel speed 720 – 800 mm/min


Please advice.

Regards,

Bogyi

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