For future use, need to have a qualified "buttering" weld procedure in place to use for closing a root opening in a repair situation.

As per Section IX QW-283, I intend to quality a basic butt welding procedure specification using a .375" thk P-1 matl. plate, single V groove joint design with metal backing with SMAW process. The root opening will purposely be large and will surface weld metal buildup with a deposit of .1875" thk, then make subsequent weld passes to join the members.

During each deposition pass of weld metal, the surface shall receive magnetic particle examination to reqs of Appendix 6 of Sec VIII Div 1.

After successfull PQR and subsequent WPQ tests, what thickness range of "butter" weld metal is the production welder qualified to?

According to QW-283.3 Buttering Thickness, I understand that if thickness of "butter" weld metal is less than .1875" that the actual deposited "butter" weld metal becomes the minimum qualified thickness. And I would assume the maximum thickness would be twice the deposited "butter" weld metal thickness.

My ? is what would be the minimum & maximum qualified thickness for .1875" deposited "butter" weld metal thickness?

Thanks in advance for comments and advice,
QCRobert

sooeey2u,

Based on the descriptions below from QW 492 I would say your repair work would be classed as build up and not buttering.

Build-up of base metal/restoration of base metal thickness:
this is the application of a weld material to a base metal so
as to restore the design thickness and/or structural integrity.
This build-up may be with a chemistry different from the
base metal chemistry which has been qualified via a standard
butt welded test coupon. Also, may be called base
metal repair or buildup.

buttering: the addition of material, by welding, on one or both faces of a joint, prior to the preparation of the joint
for final welding, for the purpose of providing a suitable
transition weld deposit for the subsequent completion of
the joint.

Regards,
BB