Dissimilar thickness, problem in root

By meisam Date 02-09-2015 10:32

Dear Experts
In the attached images which are macrographs of a sample that welded 8" pipe to 8" pipe (about 12mm thick to 16mm thick). The offset done by the surface allignment so the effect of dissimilar thickness is in root of the weld.
The questions are according to AWS D1.1 (consider it as a statically loaded):
1 - Is this joint design is permitted or not?
2 - What is your idea about the surface which is marked with "A" letter? It could be LOF or any other type of flaw?

Macrograph of dissimilar thickness weldment (139k)

By SCOTTN

Date 02-09-2015 13:48

Whether the joint design is permitted or not, within D1.1 criteria, D1.1 allows the EOR to modify, add to, or delete from what the code defines as his/her responsibilities.

D1.1 allows CJP and PJP butt joints of unequal base metal thicknesses to have a contouring fillet weld applied over these groove welds in static applications. This weld reduces the severity of the stress that would otherwise be present before this fillet weld is added. The picture doesn't look like a continuous contour.

By 803056

Date 02-09-2015 21:45

The joint depicted is similar to the joint used when qualifying a WPS or welder for T, Y, and K connections between tubular members. The CJP, made without backing or back gouging is not prequalified and must be qualified in accordance with Clause 4.

The welds depicted look pretty good from my perspective.

Al