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[MW:22757] How i can chose filler metal for resistance crorrosion overlay metal 42CrMo (standard GB 3077-88).

By Materials & Welding
Dear Experts,
I have question about overlay for Roller of Cement with repair (Because corrosion). Base metal is 42CrMo - GB 3077-88, Diameter 1800mm   
I want ask you how to chose filler metal? and procedure (i think FCAW will be good). And how to test and check after welding?
Thanks you!

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