[MW:33255] Baking Electrods only one time, but how ?

Dear Experts, 

I have a question about baking of electrodes. spec or other says backing of electrodes only one time. Now my question is if i received electrodes carton box from manufacturer Like E7018 ok, If  baking the electodes then we maintain the elecrodes in holing oven the issuesd to welder for welding, If some electodes are not used , they are exposed in atmosperic condition about 8 hrs, In this case can i do baking again? or already once we backed the elecrode before issuing to welder, so we can't back again? because once only baking permitted. I dont know clear understand ? can anyone help this case.

 

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