WN Flange weld shrinkage rotates my SS flange
WN Flange weld shrinkage rotates my SS flange
(OP)
What is BEST PRACTICE for welding a 60" Dia SS WN flange to keep the weld from shrinking & rotating the flange face 1/8" at OD. The flange lays back at OD when weld shrinks.
Thank you
Dee Anderson
Thank you
Dee Anderson





RE: WN Flange weld shrinkage rotates my SS flange
RE: WN Flange weld shrinkage rotates my SS flange
ID bevels on Flange & Pipe with 1/6" lands.
1. Tig root ID
2. Flux core ID 1 pass
3. Sub Arc ID
4. BAck gouge OD & Sub ARc 1 pass
The flange face was flat until step 4 where it pulled 1/8" towards the weld the flange OD.
We had 1/8" lands at first and it pulled worse.
We tried 200F preheat but it was no help.
Thank you,
Dee Anderson
RE: WN Flange weld shrinkage rotates my SS flange
RE: WN Flange weld shrinkage rotates my SS flange
The primary cause of the problem is the high volume of deposited weld metal in the last pass coupled with high heat input using the SAW process in a single continuous pass. Accomodation for growth about the circumference was not provided as well as the effects of the volumetric weld shrinkage. The 1/8" land was worse because, after backgouging, a greater volume of weld metal was deposited with the single pass. It would also be interesting to know what the depth of penetration and profile (narrow or wide)of the final bead.