Definition of "Back Up Weld" on CJP Tubular K Joint?

By William J. Hall Date 05-05-2008 19:08

I am running PEQ (performance evaluation qulification) test for PaDot under D1.1:2000. The joint required is a CJP Tubular K connection, standard flat profiles for limited thickness. Fig 3.8 transition C to D shows an area past the root as "Back Up Weld" It is not dimensioned. We are able to exceed tw @ w but the "Back Up Weld" does not end up flush on the id. This weld is a 3" pipe @ 45 deg. welded to a 10" pipe. I searched through A3.0 and it did not define "Back Up Weld". Has anyone used this joint design or qualified it. Or can anyone define "Back Up Weld".

By swnorris (****)

Date 05-05-2008 19:14

If you have a D1.1 2000, the definition is shown in Annex B on page 279. It basically serves as a backing weld for additional weld passes.

By jwright650 (*****)

Date 05-05-2008 19:19

Whoops I guess I typed too slow....LOL

By swnorris (****)

Date 05-05-2008 19:44

John,

If you type slower than me, I feel sorry for you. I only use my left forefinger when I type.

By jwright650 (*****)

Date 05-05-2008 19:19

Take a quick look @ page 279 (bottom right) in Annex b of D1.1:2000....I think that is the definition that you are looking for.