[MW:18062] Usage of E7018, E 8018-B2 for root pass welding

Sirs,

 

I have a SMAW- WPS with backing for P1 to P1 & P4 to P4  material. I need to do some welding of plates without backing or back gouging.

 

a. As backing is not an essential variable, can I revise the WPS to use without backing.

b. If so, is it acceptable to use 7018 for CS roots & 8018-B2 for alloy roots (As per previous WPS with backing) without backing. Client not allowing to use 6010 for roots as it is not basic. My doubt is whether I can get the required root penetration with 7018 & 8018-B2 . Plate to be welded is only 6-12 mm thick.

 

Please clarify my doubts

 

Sumod

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